 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| may 2002 adcs 7283313b 1/56 stv0681+vv6411/6500 dual-mode digital camera chipset ? description stmicroelectronics imaging division has produced the camera co-processor stv0681 which, used with vv6411/6500 as part of a low cost dual-mode camera chipset, allows a new line of low cost cameras or toy products to be brought to the market. stv0681 is a mask rom version of stv680b, programmed with v3.00 firmware. features st have maintained the standard features already available in the successful stv068b chipset, including: l support for vv6411 (cif) and vv6500 (vga) cmos imaging sensors. l support for sdram sizes 16mbit (up to 20 cif images) or 64mbit (up to 80 cif or 26 vga images). l low resolution economy mode allows for more images to be stored. l high frame rate web cam (tethered video) over usb. l audio record/playback and delete last function l custom sounds playback (e.g. talking or musical camera) l support for an oem flashgun module l automatic anti-flicker exposure control. l image up load over rs232 or usb. l driver support for win98/win2k/winme and macos 8.6/9.0/9.1. l continuous capture while untethered (except when flashgun enabled) and downloading to avi file format l power-saving stand-by mode which maintains memory contents, as well as generally low power consumption. l simple user interface including 2 buttons, status lcd display, and buzzer. l evaluation kit (evk) available. l software development kit (sdk) allows oem pc software applications to be written. l quick power down (by holding mode button). l delete last function audio record and playback the enhanced features included in stv0681 allow audio memos to be recorded at a sampling rate of 11khz, by adding a microphone and comparator chip, and by utilizing the pre-amplifier included in vv6411/6500 sensors. these sounds can be uploaded to the pc over usb or rs232, and played back using a software application developed by the oem using the sdk. demonstration pc software with source code is available with the evaluation kit (evk). with suitable oem software, the camera could even be used to record comments about pictures or video clips in a dictaphone fashion, with the audio commentary played back when viewing the pictures/video. recorded audio sounds can also be played back on the camera, with the addition of an amplifier chip and speaker or headphone socket. by auto-detecting hardware, stv0681 will only enable these additional functions if audio hardware is fitted. actual hardware implementation is the subject of a separate stv0681 reference design (see chapter 13 ). evaluation kit and reference design evaluation kits are available for stv0681 features. precise design guidelines are available from st as a reference design manual (see chapter 13 ). note: simultaneous audio record and continuous video capture is not possible.
stv0681+vv6411/6500 2/56 adcs 7283313b table of contents chapter 1 introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 1.1 digital camera chipset ..................................................................................................... ..... 5 1.2 sensor choices ............................................................................................................. ........ 7 1.3 key system features ........................................................................................................ ..... 7 chapter 2 detailed features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1 sensor type and image formats ........................................................................................... 9 2.2 user interface ............................................................................................................. ........ 11 2.3 battery level detect and usb auto-switch .......................................................................... 13 2.4 audio record and playback ................................................................................................. 1 3 2.5 pc interface options and software support ........................................................................ 14 2.6 anti-flicker exposure and gain control ................................................................................ 15 chapter 3 camera modes of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 3.1 modes available ............................................................................................................ ..... 16 3.2 description of modes ....................................................................................................... .. 17 chapter 4 stv0681 hardware interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 4.1 sensor interface ........................................................................................................... ...... 19 4.2 memory interface ........................................................................................................... .... 19 4.3 usb interface .............................................................................................................. ....... 22 4.4 uart module for rs232 interface ..................................................................................... 23 4.5 power management and battery type ................................................................................ 24 4.6 quartz crystal ............................................................................................................. ........ 25 4.7 numeric lcd interface ...................................................................................................... .25 4.8 switches and leds .......................................................................................................... .. 26 4.9 flashgun hardware interface .............................................................................................. 27 4.10 ir filter ................................................................................................................. ............... 27 chapter 5 software support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 5.1 general features ........................................................................................................... ..... 28 5.2 software installation ...................................................................................................... ..... 29 adcs 7283313b 3/56 stv0681+vv6411/6500 chapter 6 detailed chipset specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 6.1 typical camera specifications ............................................................................................ 30 6.2 stv0681 companion processor ......................................................................................... 31 6.3 vv6411 and vv6500 sensors ............................................................................................ 34 6.4 typical current consumption of complete camera .............................................................. 35 chapter 7 stv0681 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 7.1 stv0681 pinout ............................................................................................................. .... 36 7.2 stv0681 pin description .................................................................................................... 37 chapter 8 stv0681 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42 chapter 9 vv6411 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43 9.1 vv6411 pinout .............................................................................................................. ...... 43 9.2 vv6411 pin description .................................................................................................... .44 chapter 10 vv6411 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46 chapter 11 vv6500 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48 11.1 vv5500 pinout ............................................................................................................. ....... 48 11.2 vv6500 pin description .................................................................................................... .. 49 chapter 12 vv6500 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52 chapter 13 evaluation kit (evk) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54 13.1 ordering details .......................................................................................................... ........ 54 13.2 technical support ......................................................................................................... ...... 55 stv0681+vv6411/6500 4/56 adcs 7283313b document revision history revision draft date comments a 1.0 may 2001 original release (product preview) b 4.0 april 2002 document status updated to datasheet. major changes : removal of all mentions to sensors referenced vv6410 and vv6444 adcs 7283313b 5/56 stv0681+vv6411/6500 introduction 1 introduction 1.1 digital camera chipset 1.1.1 general this document describes the features and functionality of a cmos chipset, comprising an stmicroelectronics (st) cif or vga resolution sensor and an stv0681 companion processor, as well as outlining what peripheral components are required/supported in order to complete a camera using the chipset. such a camera is particularly suited to dual-mode digital stills or toy applications. 1.1.2 stills capture and image upload in stills mode, the camera stores raw image data in memory. the camera carries out no colour processing, ensuring its simplicity and low cost. subsequent upload of raw data to a pc or macintosh for processing is done through an rs232 or usb interface, through demo software, a twain driver, or oem custom application. the license to use the colour algorithm (embedded in the pc or mac driver software) is included in the price of the chipset. 1.1.3 webcam video over usb a video option is provided, when tethered through usb, which can allow for video for microsoft windows ? applications, and video clips can be recorded while untethered by continuously capturing images while in continuous mode, then downloaded to the pc for playback, using software to create an avi file. 1.1.4 audio features the stv0681 allows audio memos to be recorded at a sampling rate of 11khz. these sounds can be uploaded to the pc over usb or rs232 and played on the pc, or can be replayed on the camera. with audio playback hardware fitted to the camera, it is possible to download a set of up to 20.wav file sound bites, to store in sdram, which can each be linked to a particular camera function. this allows for camera theme music, custom sounds such as an imitation shutter click-whirr, or for certain functions to talk to the user, e.g. nice picture!. this has limitless possibilities for oem language customizing or licensed character cameras. downloading of sounds is possible using an oem application developed using the sdk, and a demonstration pc application with source code is available with the evk. sounds are stored in sdram and will therefore reduce the number of images/amount of audio which can be stored, stv0681 calculates the remaining memory and displays the number of images left. sounds can only be stored when untethered while battery power is maintained. 1.1.5 flashgun support the addition of an oem flashgun module increases the camera capabilities and improves low light image quality. stv0681 flashgun support includes modified exposure control, an enable input and a correctly timed trigger output. although it remains the responsibility of the oem to source a suitable flashgun module, advice on hardware interfacing, flash charge sensing, and required flashgun energy are given in a separate flashgun application note (an1312), please contact st for details. introduction stv0681+vv6411/6500 6/56 adcs 7283313b 1.1.6 delete last function an additional user interface function is available in stv0681 with either audio record or playback hardware fitted, which allows the user to delete the last image or continuous clip to be captured, or the last audio memo to be recorded. the standard clear all (cl) function remains, whether or not audio hardware is fitted. 1.1.7 backward compatibility with stv0680b stv0681 is electrically and functionally compatible with cameras which have been designed for stv0680b, and uses the same pc/mac drivers, however the change of device pinout means that some pcb re-design will be required. precise design guidelines are available from st as a reference design (see chapter 13 ). a software development kit (sdk) for pc is available from st, to interface to the camera and provide the basis for developing a custom software application for stills and/or video, which includes colour processing software. figure 1: typical camera system block diagram cmos sensor sensor data stv0681 usb interface 16mbit or 64mbit sdram lens + rs232 i/f usb i/f memory i/f rs232 interface gpio sensor i/f pwm led 4.5 - 6v battery e.g. 12mhz xtal audio dac lcd driver 2 x 7 seg. lcd push transceiver piezo mode buzzer shutter 4-5v (nominal) supply from battery or usb 3-4 x aa, aaa, etc. power management circuit (discretes) detect low battery to pc to pc circuit (discretes) sensor clock ir filter vv6500(vga) vv6411(cif) image array audio pre-amp speaker microphone comparator buttons: /record oem flashgun enable/trigger module audio enable/trigger flashgun amplifier vreg 3v3 supply subject adcs 7283313b 7/56 stv0681+vv6411/6500 introduction 1.2 sensor choices the following sensors are supported: 1.3 key system features the key features of a typical camera based on the stv0681 chipset are as follows: 1.3.1 image features l support for cif resolution sensor (vv6411) - 352 x 288 pixels l support for vga resolution sensor (vv6500) - 640 x 480 pixels l 80 picture storage capacity possible for cif, with 64mb memory l 26 picture storage capacity for vga, with 64mbit memory l a greater number of images can be stored when low resolution mode is enabled (e.g. 80 qcif images with 16mbit memory, 107 qvga images with 64mbit memory). see table 2 . l automatic anti-flicker exposure and gain control l support for flashgun. 1.3.2 user features on camera l self-timer mode allows a picture to be captured after several seconds. l twin 7 segment lcd panel supported - showing number of pictures left, and modes. l picture counter helps the user to know how much memory is left. l un-tethered continuous mode allows capture of image sequences for storage in memory and subsequent download to pc. l piezo buzzer indicates a number of useful events to the user, e.g. whether enough light is present for picture capture, etc. l indicator led. l clear all function clears camera. l low resolution mode increases number of images which can be captured by reducing image resolution. l audio record function (if audio record hardware detected) allows sounds to be recorded. l audio playback function (if audio playback hardware fitted) allows sounds which have been recorded to be played back. l delete last function allows user to delete audio memos, pictures or continuous clips, deletion must be carried out most reset first. l camera can be configured by the user to play custom sounds at certain functions, using a pc application. l go to sleep function, whereby the camera can be put into standby mode while untethered. table 1: sensor choices with stv0681 sensor resolution sensor supply voltage vv6411 cif (352 x 288) 3.3v vv6500 vga (640 x 480) introduction stv0681+vv6411/6500 8/56 adcs 7283313b 1.3.3 user features on pc software pc software allows a number of features, including fast download of thumbnail images for picture selection, and automatic detection and correction of sensor defects. the driver compatibility includes: l twain driver to suit all twain compatible imaging applications l video for microsoft windows ? pc driver for tethered video mode (through usb), available at all resolutions, with fastest framerates at qcif resolution l avi video file creation from image sequences captured in continuous mode l quicktime video driver and adobe photoshop stills plug-in for mac custom oem pc software can be developed by using the sdk (for sdk availability, contact st), to upload thumbnails/still images or continuous images, e.g. for avi file creation. the sdk (version 2.90 or later) allows for: l the oem to write a custom application for uploading sound memos, based on the example lcdc demo software. l the oem to write a custom application for downloading custom sounds to the camera, based on the example customsound software. 1.3.4 power management features and usb compliance l retention of pictures, recorded sounds, and downloaded custom sounds with extremely low power operation, which appears to the user as if the camera is switched off. l auto power-off after 30sec with no user activity l operates from 4.5-6v battery, although system voltage is 5v or 3.3v, dependant on sensor. l low battery detection l dependant on hardware configuration, switch-over to usb power supply is supported, to allow the device to operate with low batteries or without batteries, when connected to usb. l full usb compliance requirements are listed in the usb specification, however, in a camera designed using this chipset, the following must at least be included: (a) an sdram with sufficiently low self-refresh current, (b) usb inrush protection circuitry, to maintain sufficient supply voltage to the 5v sensor. see section 6 for further details. 1.3.5 general features l high speed picture/sounds upload to pc/mac over usb l st colour processing algorithms included under license (as part of drivers/sdk) l usb or rs232 serial interface options, and vfw / twain driver support. adcs 7283313b 9/56 stv0681+vv6411/6500 detailed features 2 detailed features 2.1 sensor type and image formats the sensor type is auto-detected by stv0681, which ensures that the correct sensor timing is enabled, and the correct image resolutions are enabled, as shown in table 2 . for stills photography, high or low resolution mode can be selected, to give cif or qcif pictures from a cif sensor, and vga or qvga from a vga sensor (see table 2 ). reduced resolution allows for storage of more images. images captured in both high and low resolution can be stored in camera memory at the same time. therefore there is no need for images stored in memory to be cleared before changing image resolution. where usb is connected, the host pc software (through a video for microsoft windows ? driver) can activate tethered video mode, regardless of the user inputs to the camera buttons. in this case, the image resolution is controlled by the pc driver. note: when tethered vfw video (pc) or quicktime driver (mac) is activated, all images or recorded sounds or video clips will be deleted from the camera sdram. a software solution is available (camera control, as part of the sdk for pc, and plugn save for mac) which can monitor whether a camera is connected and will warn the user if activating the vfw driver will cause sdram contents to be deleted. note: 1 vfw framerate is dependent on pc performance and usb bus loading 2 the number of images which can be stored is reduced if audio sounds have been recorded on the camera or if custom sounds have been downloaded from the pc to the camera. the reduction of capacity depends on the length of audio clip, but a rough guide is that if 1 cif image uses the same amount of sdram as 10sec of audio, and one vga image uses the same amount of sdram as 30 sec. of audio. 3 a cif camera with stv0681 and 64mbit sdram can store up to 320 images by using qcif mode. where >99 images are still available, the lcd display will remain at 99. where (no. of images available) <99, the lcd display will show the number of images available, as is the case with all other modes. table 2: image modes supported sensor sensor image size resolution mode final image size max. no. of images stored in 16mbit memory ( note 2 ) max. no. of images stored in 64mbit memory ( note 2 ) approximate vfw framerate ( note 1 ) vv6411 cif 352 x 288 high cif 352 x 288 20 80 15 frames/sec. low qcif 176 x 144 (subsampled) 80 322 (see note 3 ) 22.5 frames/sec. vv6500 vga 640 x 480 high vga 640 x 480 (6) 26 2 frames/sec. low qvga 320 x 240 (subsampled) (26) 107 (see note 3 ) 12 frames/sec. detailed features stv0681+vv6411/6500 10/56 adcs 7283313b 2.1.1 vv6411 vv6411 is a cif resolution, 3.3v cmos imaging sensor. a brief specification is shown in chapter 6 . 2.1.2 vv6500 vv6500 is a vga resolution, 3.3v cmos imaging sensor. a brief specification is shown in chapter 6 . it is possible to make a pcb which can accept a vv6411 or a vv6500 by putting the footprint for the vv6411 inside that of the vv6500. 2.1.3 ir filter for ir filter design, the best choice filter follows the gs0034 dielectric stack filter specification, which is available from stmicroelectronics. an alternative, although not optimal filter, would be schott s8612 doped glass also sold as cm500. adcs 7283313b 11/56 stv0681+vv6411/6500 detailed features 2.2 user interface the user interface supported by stv0681 comprises of user controls, buzzer sounds or customised sounds and visual displays. 2.2.1 push buttons the following are the functions which are supported by the chipset. these functions are achievable with no more than 2 push buttons. 1 mode button (wake-up/switch between modes) this button allows the user (1.1) to wake the camera up from standby mode when the camera is to be used for taking pictures, or (1.2) to switch between modes of operation shown in chapter 3 . 2 shutter button (shutter/confirm action) this button allows the user to take a picture or confirm an action, as shown in chapter 3 the modes of operation are described in chapter 3 . it may also be desirable to include an on-off slider switch. this has advantages and disadvantages, and its exact function is discussed further in the reference design available from st. where a flashgun module is included in the camera, it will be necessary to include a flash on/flash off push button or slider switch, dependant on the exact flashgun module design. possible implementations are discussed in a separate application note an1312 regarding flashgun implementation, available from st. 2.2.2 led indicator an led display camera status, i.e. to show that the camera is not in standby/pc suspend mode. 2.2.3 picture counter using 2 x 7 segment display stv0681 stores a picture counter value, which shows how many images can still be captured. stv0681 supports a 2x7 segment lcd panel. in snapshot mode and continuous capture mode, this lcd panel displays the number of pictures still available, which is useful to identify when the user is approaching the maximum number of images which can be stored (see table 2 ). it is possible to clear the images stored in memory, in order to continue taking pictures. in other modes, this lcd panel shows displays a 2-character code, which helps the user to navigate around the modes. note: a cif camera with stv0681 and 64mbit sdram can store up to 320 images by using qcif mode. where >99 images are still available, the lcd display will remain at 99. where (no. of images available) <99, the lcd display will show the number of images available, as is the case with all other modes. for suitable numeric lcd panel types, see section 4.7 . detailed features stv0681+vv6411/6500 12/56 adcs 7283313b 2.2.4 piezo buzzer an on-chip pulse width modulator (pwm) on stv0681 is used to generate buzzer sounds to signal certain events. the following are typical of the type of events which are indicated by the buzzer, and each has its own distinctive sound: 1 camera has been woken up from standby mode (either by the user pressing a button, by re- connecting the power source, or by connecting a usb/rs232 connection). 2 camera has been gone to sleep i.e. moved into standby mode. pictures are retained in memory. 3 picture has been successfully taken after the user presses the capture button. 4 picture has not been taken after the user presses the capture button. this indicates to the user that there is insufficient light, or that the exposure control was not ready due to a rapid change of lighting in the scene. 5 picture has not been taken after the user presses the capture button, due to picture counter having reached the maximum number of images. the user has the chance to zero the counter if desired. 6 end of continuous capture in un-tethered continuous mode, due to memory full. 7 self-timer activated and counting down. 2.2.5 custom sounds a camera which includes stv0681 and audio playback hardware can have a set of custom sounds downloaded from a pc application. a different sound can be associated with each of the following functions: note: 1 where a given function has a sound associated with it stored in sdram, the piezo buzzer does not give any beeps for that function. not all functions need to have custom sounds associated with them, this is the choice of the user or oem. 2 a demonstration pc application customsounds is available from st, however this is not intended for end-users. source code is available which allows the oem to build their own pc application using the sdk. table 3: list of custom sound functions power on sound delete power off continuous clip delete good picture clear memory bad picture (normally due to insufficient light) confirm action memory full low power self timer #1 flashgun on self timer #2 flashgun off low resolution flashgun trigger high resolution frequency 50khz picture delete frequency 60khz adcs 7283313b 13/56 stv0681+vv6411/6500 detailed features 2.3 battery level detect and usb auto-switch an on-chip battery level detector on stv0681 detects when the battery voltage falls below a threshold. the chosen threshold level is determined by a resistor values, as shown in chapter 6 where no usb has been detected, the lcd display flashes, which indicates that the battery is low. where a usb connection has been detected the lcd display does not flash. note: it may be a requirement of certain usb compliance tests that such additional hardware is included in the camera design, in order to enable the camera to switch to supply from usb and hence report back to the pc while connected to the usb bus without a battery. 2.4 audio record and playback 2.4.1 record a camera which includes stv0681 and a microphone, comparator and other periphery (also utilizing the sensor pre-amplifier) can be used to record sounds which are stored in the same way as images. stv0681 will auto-detect the presence of audio record hardware and include audio record and delete last functions into the user interface. the audio sample rate is 11.025khz, and the signal is digitized using a successive approximation a-d converter with 8 bits resolution. the sdram stores 1 second of audio recording per 11k bytes of memory. 2.4.2 playback a camera which includes stv0681 and an amplifier, speaker/headphone socket, and other periphery, can be used to playback sounds which were either recorded on the camera or downloaded from the pc. the quality of audio playback is largely dependant on the type of speaker used, and on the correct mounting of the speaker in the camera plastics. detailed features stv0681+vv6411/6500 14/56 adcs 7283313b 2.5 pc interface options and software support either usb interface (full speed 12mbit/sec. max.) or rs232 interface (115.2kbaud) is supported by the chipset, with driver software available from st for both. the interface type is auto-detected by the chipset. pc software can be one of the following: 1 simple image upload demonstration software supplied by st, allowing uploading of stills or continuous images. this software should not be supplied as an end-user product. 2 twain driver to suit all twain compatible imaging applications 3 video for microsoft windows ? driver for tethered video mode (usb only) 4 custom end-user software developed by oem using sdk (for sdk availability, contact st). the sdk is supplied by st as a 32-bit dll format, running on microsoft windows ? 98, and accessed through a documented software interface. this provides the basis for developing a custom software application for uploading stills and/or video. 2.5.1 usb complete images (displayed as either thumbnails or in full resolution), or the entire sdram contents (e.g. for uploading continuously captured image sequences, recorded using continuous capture mode) can be downloaded through usb, and usb connection also allows for tethered video mode to be activated by the usb driver. thumbnail image download is extremely fast for the entire memory contents in the camera. once a picture is selected for download, full image download takes approximately 0.15 seconds per image for a cif image (0.6 seconds for a vga image), plus post processing time per image. for usb interface details, see section 4.3 . note: actual usb download and post processing time also depends on pc performance and usb bus loading 2.5.2 rs232 thumbnails of images, complete stored images, or the entire sdram contents can be downloaded through rs232, but tethered video is not supported. once a picture is selected for download, full image download takes approximately 10 seconds per image for a cif image (around 30 seconds for a vga image), plus post processing time per image (of the order of 1 second approximately). for rs232 interface details, see section 4.4 . note: actual post processing time after rs232 download also depends on pc performance adcs 7283313b 15/56 stv0681+vv6411/6500 detailed features 2.6 anti-flicker exposure and gain control 2.6.1 general the chipset operates automatic exposure and gain control for either 50hz or 60hz mains-driven indoor lighting, using the same 12mhz crystal. this improves picture quality by selecting a set of exposure values which minimise flicker effects. detection of the mains frequency is dependant on the status of the gpio3 pin, which can be achieved by population of a pcb link at a late stage in production, once the country of destination is known, without the need to change the crystal frequency. the auto exposure and gain algorithm is always enabled during snapshot/self-timer/continuous mode. when the shutter button is pressed in snapshot mode, the chipset captures an image if the exposure and gain value has reached a suitable value for the current scene. if the light detected has suddenly changed, the camera may emit an audible tone to indicate that more time is required to reach the correct exposure target. in snapshot mode the chipset only captures the image data if sufficient light is present in the image. in continuous capture mode, the chipset captures images regardless of whether enough light is present. the exposure control algorithm in stv0681 chooses exposure values which minimise flicker effects from occurring under fluorescent lighting. stv0681 can only prevent flicker in lighting powered by 50hz or 60hz electricity supply, but automatic detection of the flicker frequency is not possible. hence choosing the correct anti-flicker setting is important, in order to prevent dark stripes form appearing across the image, and this selection must be done in hardware. 2.6.2 flashgun exposure where stv0681 and a flashgun module are included in the camera, and the flashgun enable signal is high, the exposure mode will operate in a different manner. the cmos sensor progressive scan readout requires that the sensor is set to maximum exposure so that all lines are being exposed at a certain point in time. the window within which the flashgun needs to fire in order to correctly expose all sensor lines is of the order of a few 100sec (contact st for more precise details), therefore the flashgun module design should have reached maximum light output within this period after the falling edge of the flash trigger output from stv0681. possible flashgun implementations, regarding hardware interface, charge sensing, and flash energy required are discussed in a separate application note an1312 regarding flashgun implementation, available from st. figure 2: illustration of flicker problem flicker setting not correct flicker setting correct camera modes of operation stv0681+vv6411/6500 16/56 adcs 7283313b 3 camera modes of operation this section refers to the two switches as discussed in section section 2.2.1 l mode: connects gpio0 pin of stv0681 to gnd when pressed l shutter: connects gpio1 pin of stv0681 to gnd when pressed pressing the mode switch repeatedly cycles through a series of modes as displayed on the lcd. when a given mode is displayed it may be selected by pressing the shutter button. if an option is not selected within 5 seconds the display will revert to showing the number of available pictures. 3.1 modes available figure 3: stv0681 modes (cif camera with 16mbit sdram assumed) normal: 20 / 80 audio record: ar audio playback: ap delete last: da / dp / dc continuous capture: ct self-timer: st clear all: cl resolution: hr / lr notes: 1. audio record only available if audio hardware is fitted 2. audio playback only available once an audio clip has been recorded 3. delete last displays (only available if audio hardware fitted) da - if the last object is an audio clip dp - if the last object is a picture dc - if the last object is a continuous capture clip the mode is inhibited if the camera is empty. 4. continuous capture mode is inhibited when the flashgun is enabled (sw6 down) press mode button after 30sec of inactivity standby mode (untethered) adcs 7283313b 17/56 stv0681+vv6411/6500 camera modes of operation 3.2 description of modes 3.2.1 standby mode (untethered) and wake-up on power-up, or wake-up from untethered standby mode, (i.e. by pressing the mode button), the camera will beep twice. the lcd will briefly indicate the camera resolution either hr. for high resolution (80 cif or 26 vga images - using 64mbit memory) or lr for low resolution (322 qcif or 107 vga images - using 64mbit memory) and then display the number of pictures which may be taken. please note that in low resolution mode, although there can be up to 322 images available, the lcd counter will only go up to 99, it will continue reporting 99 until there are less than 99 images left. the camera will go back to standby mode either after 30 seconds of inactivity, led1 will turn off and the lcd will go blank. this can also be done by pressing the mode switch for more than 2 seconds. 3.2.2 normal mode pressing the shutter button will take a picture. the camera will beep. a high pitched beep indicates that the picture was taken successfully and the counter will decrement (if there are less than 99 images left to take). a low beep indicates insufficient light to take a picture. a series of beeps indicates that the camera is full. stored pictures may be uploaded to a pc at any time, whether or not the camera is full. plugging the usb connector into the camera will cause it to reset and issue a double beep but all stored pictures will remain. when the usb connector is unplugged the camera will go to sleep. when connected to the pc the camera may still be used in the normal way. note : with the flashgun enabled the camera will always take a picture, whether or not there is sufficient light. 3.2.3 audio record - ar this mode is available with audio record hardware fitted. pressing the shutter button within 5 seconds will cause the camera to start recording for as long as the shutter button is pressed down. if the shutter button is not pressed within 5 seconds the camera will revert to normal picture taking mode. whilst recording, the lcd display flashes ar. if the recording stops because the memory is full, the memory full audio tone is sounded and the display will stop flashing and display 00. the audio data is digitized and stored in sdram. 3.2.4 audio playback - ap this mode is available with audio playback hardware fitted. pressing the shutter button within 5 seconds will cause the camera to play back the most recent audio recording. if the shutter button is not pressed within 5 seconds the camera will revert to normal picture taking mode. whilst playing, the lcd display flashes ap. once in audio playback mode, repeated presses of the shutter button will step the camera through each of the audio recordings in the camera (most recent first). keeping the shutter button pressed down will also cycle through the audio recordings. pressing the mode button during playback will stop the audio clip. note : minimum audio recording length is set to 0.5 seconds. camera modes of operation stv0681+vv6411/6500 18/56 adcs 7283313b 3.2.5 delete last object - da/dp/dc this mode is available with audio record hardware fitted. if the last object captured was an audio recording 'da' (delete audio) will be displayed, if the last object was an image, then 'dp' (delete picture) will be displayed, or, if the last object was part of a continuous capture sequence, then 'dc' (delete continuous) will be displayed. if the camera is empty, the mode will be suppressed. the mode works in the same way as cl (clear all), i.e. once the mode is selected, pressing the shutter button once will cause the camera to beep and da, dp or dc to start flashing. pressing the shutter button again within 5 seconds will delete the last audio clip, picture or continuous capture sequence. 3.2.6 continuous mode - ct pressing the shutter button within 5 seconds will cause the camera to start taking pictures for as long as the shutter button is pressed down (and the camera is not full). if the shutter button is not pressed within 5 seconds the camera will revert to normal picture taking mode. note: 1 during continuous mode the camera will allow pictures to be taken regardless of the available light, which could result in insufficient exposure. 2 in continuous mode, only every alternate field is grabbed hence capture rate is halved. e.g. 12.5fps cif and 7.5fps vga 3 continuous mode is suppressed when the flashgun enable signal (gpio2) is high. 3.2.7 self timer - st pressing the shutter button will now start a 10-second self-timer. the camera will issue a short beep every second and then a longer beep. a further beep will then indicate that the picture has been taken (high beep - picture successful, low beep - insufficient light, picture not taken). the self-timer mode can not be selected when the camera is full. the self-timer countdown cannot be stopped once it has started. 3.2.8 clearing the camera memory - cl pressing the shutter button once will cause the camera to beep and the cl to start flashing. pressing the shutter button again within 5 seconds will clear all the images/audio clips in the camera and reset the counter. 3.2.9 changing picture resolution - hr/lr the resolution option is displayed, either hr to change to high-resolution mode (if currently in low- resolution mode) or lr to change to low-resolution (if currently in high-resolution mode). press the shutter button within 5 seconds of selecting the resolution option, the camera will beep and the display will reset indicating the number of pictures available in the new mode. the picture resolution can be changed at any time, i.e. the camera can store both high and low resolution images. adcs 7283313b 19/56 stv0681+vv6411/6500 stv0681 hardware interfaces 4 stv0681 hardware interfaces 4.1 sensor interface stv0681 uses a standard st digital interface from the sensor, and the sensor clock input is provided by an output from stv0681. the design of a camera using this chipset should be implemented as closely as possible to the reference design ( chapter 6 ), in which case the chipset can be regarded as a functional black box, and no further details regarding the stv0681-sensor interface are required. 4.2 memory interface stv0681 is designed to interface to an external 16mbit or 64mbit sdram (see table 2 ). the sdram device must have a 16 bit wide data bus and operate from a 3.3v supply. two sizes of sdram memory are supported by stv0681, 16mbits (1m x 16 bits wide) or 64mbits (4m x 16 bits wide), the memory size is auto-detected by stv0681. stv0681 clocks the sdram at 6mhz, typically this is well below the figures offered by most manufacturers devices. 4.2.1 sdram current consumption for maximum system battery life while no pictures are being taken, and to assist in meeting requirements for usb compliance, an sdram should be chosen with the lowest possible self refresh current specification. in addition, the usb suspend mode current specification requires that the camera will consume no greater than 300 m a when un-tethered. meeting this specification, which is included in the requirements for usb compliance, assumes an sdram with up to approximately 250 m a self- refresh current, based on a current consumption of approximately 50 m a for stv0681 + support circuit. stv0681 hardware interfaces stv0681+vv6411/6500 20/56 adcs 7283313b 4.2.2 sdram interface timing requirements figure 4: sdram read timing (16mbit device, burst read) dclk command dqm a0-9,ba a10 active read nop precharge nop row column row dout m dout m + 1 dout m + 2 dout m + 3 dq read latency t ck t rcd t rc cke t ras dq sample dq sample dq sample dq sample t rp t cms t cmh t as t ah t l t h t cms t cmh t ac t oh adcs 7283313b 21/56 stv0681+vv6411/6500 stv0681 hardware interfaces 4.2.3 sdram refresh period the sdram refresh period from stv0681 is guaranteed to be no greater than 15.6 m s during snapshot/self-timer/continuous/tethered video modes of operation (i.e. not standby mode). in standby mode, the sdram is set to self-refresh, therefore no refresh from stv0681 takes place. 4.2.4 sdram initialisation period the sdram initialisation period is currently set to 981 m s in stv0681. figure 5: sdram write timing (16mbit device, burst write) table 4: timing parameters for sdram read/write symbol min. max units symbol min. max units t ck 166.45 166.89 ns t ds 81.01 ns t ch ?t ck t dh 83.41 ns t cl ?t ck t rcd 1t ck t ac ?t ck t ras 55t ck t oh 0nst rc 7t ck t cms 82.88 ns t rp 2t ck t cmh 82.85 ns t rcd 1t ck t as 82.88 ns t ah 82.76 ns dclk command dqm a0-9,ba a10 active write nop precharge nop row column row din m din m + 1 din m + 2 din m + 3 dq t ck t rcd t rc cke t ras t rp t cms t cmh t as t ah t l t h t cms t cmh t ds t dh stv0681 hardware interfaces stv0681+vv6411/6500 22/56 adcs 7283313b 4.3 usb interface stv0681 includes a usb version 1.1 compliant universal serial bus interface, including a transceiver. this allows direct connection from stv0681 to a usb connector with minimal additional hardware (i.e. a small number of passive discretes) - see chapter 6 the usb interface interfaces the stv0681 to the usb at full speed 12mhz data rate. some of the features are: l compliant with usb protocol revision 1.1. l usb protocol handling. l usb device state handling. l clock and data recovery from usb. l bit stripping and bit stuffing functions. l crc5 checking, crc16 generation and checking. l serial to parallel conversion. l single bulk end point. usb drivers are supplied by st. for usb timing information, please refer to the usb specification v1.1. adcs 7283313b 23/56 stv0681+vv6411/6500 stv0681 hardware interfaces 4.4 uart module for rs232 interface the uart module on stv0681 provides a 115200 baud full duplex serial interface to an external host. 4.4.1 rs232 physical interface stv0681 does not support direct connection to an rs232 serial link. physical line driver circuitry is required, e.g. using a standard rs232 transceiver chip, or by using a small number of low cost discretes (refer to reference design for details). unscreened cable can be used, a suitable low cost connector is a 3.5mm stereo audio jack plug. 4.4.2 uart module overview receiving data the uart module in stv0681 receives serial data through the rxd pin. data reception is initiated by a 1-to-0 transition on rxd, and the received data is sampled every 8.66 m s. if the rxd input is not 0 when the incoming data is first sampled, the uart module goes back to look for another 1-to-0 transition. this is to provide rejection of false start bits. if the start bit proves valid, reception of the rest of the frame will proceed. transmitting data when a transmission is activated by stv0681, the contents of an internal transmit shift register are shifted onto the txd pin, every 8.66 m s. the uart operates at 12mhz, which is not an integer multiple of 115200, so the actual baud rate is 115232 +/- 0.3%, which is well within the requirements of a typical 16x oversampling uart, which can tolerate a 3.75% error in baud rate. stv0681 hardware interfaces stv0681+vv6411/6500 24/56 adcs 7283313b 4.5 power management and battery type stv0681 and the sdram require a 3.3v supply. where a vv6411 or vv6500 (3.3v) sensor is used, a single voltage regulator can be used to regulate the supply for all three components from the battery, or the sensor on-board vreg can be used. these are explained more fully in the reference design. 4.5.1 power switching to usb included in the usb compliance requirements, is the ability of the camera to report to the pc when connected to the usb bus, whether or not there is a fresh battery in the camera. this means that power sourcing from usb is required, which also saves on battery life while the camera is used in usb tethered video mode. in order to allow switching from battery to usb power, some additional hardware is required. l the usbdetect input to stv0681 is used to detect that a usb power supply is connected l if the usb is detected, additional hardware is used to switch off the battery l an inrush protection circuit can protect the usb bus from current draw in the case of a low battery/battery not fitted. this may be necessary to comply with the usb specification. for precise usb compliance requirements, please consult the usb specification version 1.1 4.5.2 switched sensor supply dependant on the hardware implementation, the senspwr output from stv0681 can be used to put the sensor into suspend mode. this has a significant improvement on battery life. 4.5.3 battery type this is hardware dependant. the schematics referred to in chapter 6 assume either three or four 1.5v cells. adcs 7283313b 25/56 stv0681+vv6411/6500 stv0681 hardware interfaces 4.6 quartz crystal regardless of the sensor type or anti-flicker requirements, the sensor + stv0681 chipset operates from a single 12mhz fundamental quartz crystal. for specification requirements, see table 14 . stv0681 includes an on-chip low jitter pll, for pll characteristics, see table 13 . 4.7 numeric lcd interface stv0681 supports a 2-digit lcd panel only, for alpha-numeric display. 4.7.1 lcd types stv0681 connects to a non multiplexed, direct drive lcd with 2 x 7 segments. many lcd types are compatible with this interface. the lcd refresh frequency is 34.7hz. 4.7.2 lcd interface pinout the convention for segment numbering is as follows: '0' connects to segment 'a', '1' connects to segment 'b', and so on, where a to g are standard for all 7-segment displays, as well as an lcd common output, giving fifteen signals in total. stv0681 hardware interfaces stv0681+vv6411/6500 26/56 adcs 7283313b 4.8 switches and leds the gpio lines on stv0681 have pre-defined functions as follows, see section 2.2 for user interface functionality, mode push button and shutter push button: gpio0 and gpio1 both push button inputs have internal de-bounce circuits, reducing the amount of hardware required externally. it is recommended that labelling is used on the camera casing to help the user understand the functioning of the 2-button interface. 4.8.1 input to select between 50 and 60hz flicker frequency: gpio3 this allows for factory setting of the anti-flicker frequency, dependant on the final country of destination. see also section 2.6 . the polarity of this selection is detailed in the reference design. 4.8.2 led indicator output: gpio5 the led output has an 8ma current sinking capability. 4.8.3 other pins: gpio2, 4, 6, 7 with stv0681, these pins are used, as detailed in table 5 . their specific functions are detailed in the reference design and in the following documents available from st: l audio: application note an1310 l flashgun: application note an1312 4.8.4 audio record hardware interface stv0681 implements a successive approximation a/d conversion by outputting successive analogue levels through the dac output, which are compared with the actual signal level (output from the sensor microphone preamplifier), and the resultant high or low signal from the comparator is read at gpio4. the sampling frequency is 11khz, and the successive approximation is done at 8 bits resolution per sample. it is not possible to speed up the sampling frequency due to the limitation of stv0681 processing speed. an actual hardware implementation is given in the audio application note an1310. 4.8.5 audio playback hardware interface stv0681 outputs the desired signal level through the dac output, which is amplified to the speaker or headphone socket. gpio6 is used to switch off the amplifier during periods of audio recording, to prevent the successive approximation waveform from being heard during periods of recording, and to reduce the power consumption and unwanted crackle through the speaker. an actual hardware implementation is given in the audio application note an1310. table 5: other gpio usage with stv0681 gpio 2 4 6 7 audio record no yes no no audio playback no no yes no flashgun yes no no yes adcs 7283313b 27/56 stv0681+vv6411/6500 stv0681 hardware interfaces 4.9 flashgun hardware interface stv0681 will revert to flashgun exposure when it detects gpio2 is high. ideally the hardware should combine the two factors of (a) user intention (e.g. user switches on flashgun) and (b) charge sensing (i.e. flash is charged up and ready to fire). these two factors (a) and (b) are independent, since there may be a delay of several seconds between switching on the flashgun charger, and the flashgun being able to fire. to revert to flashgun exposure before the flashgun is completely charged up would cause very bad pictures to be taken in low light conditions because there is no low light threshold when flashgun exposure is enabled, since the camera expects a flash to fire. a suggested flashgun hardware interface is given in the flashgun application note an1312. when flashgun exposure is enabled and the shutter button is pressed, a picture will be taken and the flash trigger pin gpio7 will be pulsed low at the correct point in time so that all lines of the cmos imager are exposed. 4.10 ir filter an infra-red blocking filter is required to achieve correct colour response. the exact specification for the ir filter characteristics are given in the reference design manual. software support stv0681+vv6411/6500 28/56 adcs 7283313b 5 software support 5.1 general features the chipset is a dual-mode camera, i.e. stills and video, and is supported by a range of demonstration software, standard drivers, and software development options. driver software is available to support both usb and rs232 interface including standard twain and video for microsoft windows ? drivers (vfw through usb only) for win98/win2k/winme. quicktime drivers and a photoshop stills plug in for macos 8.6/9.0/9.1 are also supported. example software applications (pc only) are provided to create .avi video files from untethered continuous capture of images (avicreator), to upload still images and recorded sounds (lcdcdemo) and to download .wav files from the pc to the camera (customsound). in each case, pc source code is provided to assist in oem software development using the sdk. st colour processing and defect detection/correction software runs on the host and is supplied under licence agreement, as part of all host software/drivers/sdk. 5.1.1 still image upload this is available through demonstration software, oem custom software, or using standard twain applications. features include: l fast upload through usb, or upload through rs232. l colour display of image thumbnails for picture selection. l download of full image once selected by user software. l automatic detection and correction of sensor defects l colour processing of full image, using the st colour process the above features also apply to avi creator or any oem custom software for avi video creation from pictures taken while un-tethered, since this is essentially a stills function. 5.1.2 streaming video (only while tethered to usb) this is available through demonstration software, or using standard vfw applications. features include: l streaming video through standard vfw driver l automatic detection and correction of sensor defects l colour processing of full image, using the st colour process adcs 7283313b 29/56 stv0681+vv6411/6500 software support 5.2 software installation the following software support is only available to oems. access to the latest installation files is possible through a password-protected web page, contact st for details. the install file gives the option to install: l drivers (always check web site for latest driver version). l evk software, i.e. lcdcdemo.exe and avicreator.exe, g2video.exe, and ctitest2.exe l sdk installation: source code for sample applications, and documentation 5.2.1 driver support available 5.2.2 evk software note: the following is also supplied with evaluation kits/demonstration units, but all the following software is only for demonstration purposes and should not be supplied as an end-user product. however, application-level source code (i.e. not driver/colour processing source) for lcdcdemo.exe, avi creator, and ctitest.exe is available as part of the sdk, which allows similar applications to be built by the software developer: 1 simple demonstration software lcdcdemo.exe for uploading thumbnails and images. 2 avicreator.exe software for uploading continuous images for creating movie clips. 3 g2video.exe is a vfw application which shows streaming video while tethered to usb and allows creation of.avi video clips. 4 ctitest.exe is only for debugging purposes, for software developers using the sdk 5.2.3 software development kit (sdk) and source code a software development kit allows the oem to develop a custom application which calls the same range of drivers as listed in section 5.2.1 , hence allowing the oem application to perform picture download, thumbnail display, and colour processing using the st colour process. inclusion of source code for the applications listed in section 5.2.2 allows the software developer to use these as the basis for their own application. the sdk is supplied by st as a 32-bit dll format, running on microsoft windows 98/win2k tm , and accessed through a documented software interface. development requires microsoft visual studio ver. 6 or later. this provides the basis for developing a custom software application for stills. note: source code for pc drivers, defect correction, and colour processing algorithms are not available. table 6: driver choices interface type: rs232 usb pc operating system microsoft windows ?: win9x, winnt4, win2k, windows millennium microsoft windows ?: win98 and win2k only, windows millenium mac os n/a 8.6, 9.0, 9.1 detailed chipset specifications stv0681+vv6411/6500 30/56 adcs 7283313b 6 detailed chipset specifications 6.1 typical camera specifications the following data assumes that the camera has been built according to the st reference design. dual usb or battery power supply is only possible when the required power switching hardware is included. figures are approximate and depend on actual components sources. table 7: typical camera specifications supply voltage 4.1-6v (when powered from battery or usb) operating temperature range 0 o c - 40 o c max. rs232 cable length supported 2m cif output 352 x 288 pixels qcif output 176 x 144 pixels vga output (using vv6500) 640 x 480 pixels qvga output (using vv6500) 320 x 240 pixels sdram storage and image upload format raw bayer pc driver output format colour rgb bitmap table 8: approximate shutter speeds sensor min. max vv6411 8.67 m s44ms vv6500 7.94 m s66ms adcs 7283313b 31/56 stv0681+vv6411/6500 detailed chipset specifications 6.2 stv0681 companion processor table 9: stv0681 specifications parameter min. typ. max. units supply voltage 3.0 3.3 3.6 v current consumption (normal operation) 18 - ma stand-by current consumption - 10 - a package 100tqfp (14x14x1.4) exposure control 1 000 000 : 1 table 10: stv0681 absolute maximum ratings parameter range units ambient temperature 0 to 40 c storage temperature -50 to 150 c voltage on usb d+/d- 0-vdd v detailed chipset specifications stv0681+vv6411/6500 32/56 adcs 7283313b note: 1 v di = |(d+) - (d-)| 2v cm includes v di range. 3tf rfm =(tf r / tf f ). 4z drv includes an external resistor of 20 ohms serial to this transceiver. table 11: stv0681 usb specifications parameter description min. typ max units notes vdd power supply 3.0 3.3 3.6 v v ilu usb differential pad d+/d- input low 0.8 v v ihu usb differential pad d+/d- input high (driven) 2.0 v v ihuz usb differential pad d+/d- input high (floating) 2.7 3.6 v v di usb differential pad d+/d- input sensitivity 0.2 v 1 v cm usb differential pad d+/d- common mode voltage 0.8 2.5 v 2 v olu usb differential pad d+/d- output low voltage 0.0 0.3 v v ohu usb differential pad d+/d- output high voltage 2.8 3.6 v v crs usb differential pad d+/d- output signal cross over voltage 1.51 1.79 v r pu usb differential pad d+/d- pull up resistor 1.425 1.575 k w r pd usb differential pad d+/d- pull-down resistor 14.25 15.75 k w tf r rise time 4 20 ns tf f fall time 4 20 ns tf rfm differential rise time and fall time matching 96 98 % note 3 z drv driver output resistance 24.7 26.6 30.0 w note 4 table 12: stv0681 dc characteristics parameter description min. typ max units notes v ii cmos input low voltage 0.35 vdd v v ih cmos input high voltage 0.65 vdd v v t+ cmos schmitt input low to high threshold voltage 2.15 v v t- cmos schmitt input high to low threshold voltage 1.05 v v t threshold point 1.65 v v oh output high voltage 2.4 v v ol output low voltage 0.4 v adcs 7283313b 33/56 stv0681+vv6411/6500 detailed chipset specifications table 13: stv0681 pll characteristics parameter conditions symbol min. typ max unit peak to peak jitters @vcofreq = 240mhz - 312mhz -- -- -- 500 ps duty cycle -- 45 50 55 % operating voltage range vdd 3 3.3 3.6 v input low voltage vdd=3.3v vil - 0.8 v input high voltage vdd=3.3v vih 0.7vdd vdd v pull in time + locking time ready -- -- 0.1 ms output slew rate cl: output load (pf) tsr(fout) -- 0.100+0.1082*cl -- ns table 14: stv0681 crystal tolerance parameter min. typ max units crystal specification 50/50/10/30 (12mhz fundamental) crystal frequency 12.000 mhz frequency tolerance 50 ppm temperature stability 50 ppm operating temperature -10 deg. c detailed chipset specifications stv0681+vv6411/6500 34/56 adcs 7283313b 6.3 vv6411 and vv6500 sensors note: 1 assuming appropriate external hardware recommendations are implemented, the sensor suspend pin is asserted during standby mode/pc suspend mode. hence the sensor is placed in sensor suspend mode by means of (a) a serial interface message and (b) the suspend pin being asserted. 2 where the external hardware does not permit the sensor suspend pin to be asserted (during standby mode/pc suspend mode, the sensor is placed in sensor suspend mode by means of a serial interface message only. this increases current consumption due to a pull-up on the suspend pin. this only applies to vv6500. table 15: vv6411 specifications colour image format 352 x 288 pixels (cif) pixel size 7.5 x 6.9 m m image array size 2.67mm x 2.04mm array format cif sensor signal / noise ratio approx. 57db package type 36lcc supply voltage 3.3v dc +/-5% operating temp. range 0 o c - 40 o c current consumption min. typ max. units snapshot/self-timer/continuous/tethered video modes of operation 25 40 ma stand-by mode/pc suspend mode <70 100 m a table 16: vv6500 specifications colour image format 640 x 480 pixels (vga) pixel size 7.5 x 7.5 m m image array size 4.89mm x 3.66mm array format vga sensor signal / noise ratio approx. 57db supply voltage 3.3v dc +/-5% package type 48lcc operating temp. range 0 o c - 40 o c current consumption min. typ max units snapshot/self-timer/continuous/tethered video modes of operation 30 50 ma standby mode/pc suspend mode, suspend pin asserted (see note 1 ) <100 150 m a standby mode/pc suspend mode, suspend pin not asserted (see note 2 ) <200 200 m a adcs 7283313b 35/56 stv0681+vv6411/6500 detailed chipset specifications 6.4 typical current consumption of complete camera the following data assumes that the camera has been built according to reference design referred to in chapter 13 . figures are approximate and depend on actual components sources - see notes. the sensor operates at @ 3.3v dc note: 1 see table 9 from section 6.2 2 from limited evaluation, typical self-refresh current figures of certain sdram chips are well below manufacturers maximum specification, e.g. 100-250 m a . for sensor suspend mode current, see table 15 and table 16 . 3 if the appropriate hardware to assert the sensor suspend pin is not fitted, an additional current consumption in standby/pc suspend mode of approx. 50 m a can be expected with vv6500. 4 option included in reference design to save current consumption, which can increase battery life and increase chances of meeting usb suspend mode compliance requirements. table 17: current consumption, complete stv0681+vv6411/6500 camera mode typical comments snapshot/continuous/ self timer mode (while un-tethered) 60ma assuming appropriate hardware included, power is sourced from pc while usb connected. snapshot/continuous/ self timer mode (while tethered to pc) 60ma while playing back audio sounds through speaker 90ma assuming 8 w speaker as explained in application note an1310 standby mode (when not connected to usb): sensor suspend pin asserted (see note 3 ) approx. 270a + sdram self-refresh current (see note 2 ) + sensor suspend mode current (see note ) total current in this mode equals : stv0681 standby current consumption (see note 1 ) + sdram self-refresh current (see note 2 ) + peripheral circuitry (approx. 50 m a). + sensor suspend mode current (see note ) pc suspend mode (when connected to usb): sensor suspend pin asserted (see note 3 ) approx. 300a + sdram self-refresh current (see note 2 ) + sensor suspend mode current (see note ) total current in this mode equals : stv0681 standby current consumption (see note 1 ) +sdram self-refresh current (see note 2 ) + peripheral circuitry (approx. 50 m a). + 200 m a, based on 1.5k pull-up in camera and 15k pull- down in pc. + sensor suspend mode current (see note ) standby mode (when not connected to usb): sensor powered off using fet (see note 4 ) approx. 270a + sdram self-refresh current (see note 2 ) total current in this mode equals : stv0681 standby current consumption (see note 1 ) +sdram self-refresh current (see note 2 ) + peripheral circuitry (approx. 50 m a). pc suspend mode (when connected to usb): sensor powered off using fet (see note 4 ) approx. 100a + sdram self-refresh current (see note 2 ) total current in this mode equals : stv0681 standby current consumption (see note 1 ) +sdram self-refresh current (see note 2 ) + peripheral circuitry (approx. 50 m a). stv0681 pin description stv0681+vv6411/6500 36/56 adcs 7283313b 7 stv0681 pin description 7.1 stv0681 pinout figure 6: stv0681 pinout diagram 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 stv0681 tqfp100 dq_15 dq_1 dq_14 dq_2 dq_13 dq_3 dq_12 dq_4 dq_11 dq_5 vdd vss dq_10 dq_6 dq_9 dq_7 dq_8 dqml we dqmu cas dclk ras cke cs reset xout xin test2 test1 test0 usb- usb+ usb_det ad_4 ad_3 vdd vss ad_5 ad_2 ad_6 ad_1 ad_7 ad_0 ad_8 ad_10 ad_9 ad_13 ad_11 ad_12 mode shutter flash_en 50/60 comp_out vss vdd led amp_en fl_trig senspwr sensrst sens_clk qclk sd[0] sd[1] sd[2] sd[3] sda scl rxd txd pll_gvss pll_avss pll_avdd aud_vss lo_bat_ref lo_bat dacres dacout aud_vdd piezo lcd_com vss vdd lcd2_6 lcd2_5 lcd2_4 lcd2_3 lcd2_2 lcd2_1 lcd2_0 lcd1_6 lcd1_5 lcd1_4 lcd1_3 lcd1_2 lcd1_1 lcd1_0 dq_0 adcs 7283313b 37/56 stv0681+vv6411/6500 stv0681 pin description 7.2 stv0681 pin description table 18: stv0681 pin listing pin no. signal type description drive sensor interface 65 senspwr output, active high power-up sensor 2ma (sl) 64 sensrst output, active low reset sensor 2ma (sl) 56 scl input/output (od,t) sensor serial interface 4ma (sl) 57 sda input/output (od,t) sensor serial interface 4ma (sl) 58 sd[3] input (s,t) sensor data 59 sd[2] input (s,t) sensor data 60 sd[1] input (s,t) sensor data 61 sd[0] input (s,t) sensor data 62 qclk input (s,t) qualification clock from sensor 63 sens_clk output clock output to sensor 4ma i/o and camera control pins 75 mode debounced input push button (wake-up/mode) 74 shutter debounced input push button (shutter/confirm) 73 flash_en input enable flash exposure (active high) 72 50/60_sel input s elect between 50hz and 60hz lighting 71 comp_out input output from audio comparator 68 led output (od) led indicator 8ma (sl) 67 amp_enable output, active low (od) audio amplifier enable 8ma (sl) 66 fl_trig output, active low (od) flashgun trigger 8ma (sl) usb interface 42 usbdet input (s) detect power source from usb. (for camera with rs232 only, this pin should be tied to gnd) usb specific ation v1.1 complia nt i/o 43 data+ input/output usb bus (for camera with rs232 only, this pin should be connected to test points to allow for usb production test (lens focussing)) 44 data- input/output usb bus. (for camera with rs232 only, this pin should be connected to test points to allow for usb production test (lens focussing)) stv0681 pin description stv0681+vv6411/6500 38/56 adcs 7283313b rs232 interface 54 txd output serial data transmit (for camera with usb only, this pin should be tied to rxd) 4ma (sl) 55 rxd input (s) serial data receive (for camera with usb only, this pin should be tied to txd) stv0680b master clocks and reset 48 xin input quartz crystal in 49 xout output quartz crystal out 50 reset input (s) active (low) stv0680b reset system memory (sdram) interface 20 dqmu output data input/output mask for dram_dq[15:8] 2ma (sl) 22 dclk output clock: all sdram input signals are sampled on the positive edge 4ma (sl) 24 cke output clock enable: activates (high) and deactivates (low) the sdram clk signal 2ma (sl) 32 ad0 output sdram address a0 2ma (sl) 34 ad1 output sdram address a1 2ma (sl) 36 ad2 output sdram address a2 2ma (sl) 40 ad3 output sdram address a3 2ma (sl) 41 ad4 output sdram address a4 2ma (sl) 37 ad5 output sdram address a5 2ma (sl) 35 ad6 output sdram address a6 2ma (sl) 33 ad7 output sdram address a7 2ma (sl) 31 ad8 output sdram address a8 2ma (sl) 29 ad9 output sdram address a9 2ma (sl) 30 ad10 output sdram address a10 2ma (sl) 27 ad11 output sdram address a11 for 64m sdram or ba for 16m sdram 2ma (sl) 26 ad12 output sdram address a12, ba0 for 64m sdram, unused on 16m 2ma (sl) table 18: stv0681 pin listing pin no. signal type description drive adcs 7283313b 39/56 stv0681+vv6411/6500 stv0681 pin description 28 ad13 output sdram address a13, ba1 for 64m sdram, unused on 16m 2ma (sl) 25 cs output, active low chip select: enables (registered low) and disables (registered high) the sdram command decoder. 2ma (sl) 23 ras output, active low sdram row address strobe command 2ma (sl) 21 cas output, active low sdram column address strobe command 2ma (sl) 19 we output, active low sdram write enable command 2ma (sl) 18 dqml output data input/output mask for dram_dq[7:0] 2ma (sl) 100 dq0 input/output sdram data bus 2ma (sl) 2 dq1 input/output sdram data bus 2ma (sl) 4 dq2 input/output sdram data bus 2ma (sl) 6 dq3 input/output sdram data bus 2ma (sl) 8 dq4 input/output sdram data bus 2ma (sl) 10 dq5 input/output sdram data bus 2ma (sl) 14 dq6 input/output sdram data bus 2ma (sl) 16 dq7 input/output sdram data bus 2ma (sl) 17 dq8 input/output sdram data bus 2ma (sl) 15 dq9 input/output sdram data bus 2ma (sl) 13 dq10 input/output sdram data bus 2ma (sl) 9 dq11 input/output sdram data bus 2ma (sl) 7 dq12 input/output sdram data bus 2ma (sl) 5 dq13 input/output sdram data bus 2ma (sl) 3 dq14 input/output sdram data bus 2ma (sl) 1 dq15 input/output sdram data bus 2ma (sl) table 18: stv0681 pin listing pin no. signal type description drive stv0681 pin description stv0681+vv6411/6500 40/56 adcs 7283313b lcd interface 83 lcdcom output lcd common 4ma (sl) 93 lcd1_6 output lcd digit 1 segment g 2ma (sl) 94 lcd1_5 output lcd digit 1 segment f 2ma (sl) 95 lcd1_4 output lcd digit 1 segment e 2ma (sl) 96 lcd1_3 output lcd digit 1 segment d 2ma (sl) 97 lcd1_2 output lcd digit 1 segment c 2ma (sl) 98 lcd1_1 output lcd digit 1 segment b 2ma (sl) 99 lcd1_0 output lcd digit 1 segment a 2ma (sl) 86 lcd2_6 output lcd digit 2 segment g 2ma (sl) 87 lcd2_5 output lcd digit 2 segment f 2ma (sl) 88 lcd2_4 output lcd digit 2segment e 2ma (sl) 89 lcd2_3 output lcd digit 2segment d 2ma (sl) 90 lcd2_2 output lcd digit 2segment c 2ma (sl) 91 lcd2_1 output lcd digit 2 segment b 2ma (sl) 92 lcd2_0 output lcd digit 2 segment a 2ma (sl) piezo interface 82 piezo output direct connection to piezo buzzer 8ma (sl) battery level comparator interface 78 lo_bat input (a) battery level comparator input. the voltage on low_bat is compared to the reference to determine the battery status 77 lo_bat_ref input (a) 1.22v battery level comparator reference input table 18: stv0681 pin listing pin no. signal type description drive adcs 7283313b 41/56 stv0681+vv6411/6500 stv0681 pin description note: 1 where the i/o pad type is not explicitly defined, assume cmos. power and ground 12, 38, 70, 84 dvss power pin digital ground 11, 39, 69, 85 dvdd power pin digital power 76 aud_vss power pin audio dac ground. requires clean supply. 81 aud_vdd power pin audio dac power. requires clean supply. 53 pllgvss power pin pll guard ground 51 pllavdd power pin pll analog power 52 pllavss power pin pll analog ground non-user pins 45 test0 input non-user pin - connect to 3v3 46 test1 input non-user pin - connect to 3v3 47 test2 input non-user pin - connect to 3v3 79 dacres i(a) dac bias amplifier reference input. 80 dacout o (a) 8-bit dac current source output. 0-10ma key sl slew rate limited output od open drain output s schmidt input a analogue input/output t 5v tolerant pad (these pads do not have diode protection) table 18: stv0681 pin listing pin no. signal type description drive stv0681 package mechanical data stv0681+vv6411/6500 42/56 adcs 7283313b 8 stv0681 package mechanical data tqfp100 dim. mm inch min. typ. max. min. typ. max. a 1.60 0.063 a1 0.05 0.15 0.002 0.006 a2 1.35 1.40 1.45 0.053 0.055 0.057 b 0.17 0.22 0.27 0.007 0.009 0.011 c 0.09 0.20 0.003 0.008 d 16.00 0.630 d1 14.00 0.551 d3 12.00 0.472 e 0.50 0.019 e 16.00 0.630 e1 14.00 0.551 e3 12.00 0.472 l 0.45 0.60 0.75 0.018 0.024 0.030 l1 1.00 0.039 3 k 3.5 (min.), 7 (max.) a a2 a1 seating plane c 50 51 75 76 d3 d1 d e tqfp100m 0.076mm .003 inch k l l1 pin 1 identification 100 1 b 25 26 e e1 e3 adcs 7283313b 43/56 stv0681+vv6411/6500 vv6411 pin description 9 vv6411 pin description 9.1 vv6411 pinout figure 7: 36 pin lcc package pin assignment resetb d[0] lst/d[5] fst/d[6] vddcore/ vbus vbg nc aoutp vddhi oeb clki 7 8 6 5 4 3 2 1 9 10 11 12 13 14 15 16 17 19 20 21 22 23 24 25 26 27 28 29 32 33 34 35 36 d[3] d[4] aud3v3 aoutn vbase avss 18 30 31 nc d[1] vid3v3 ain vsscore vssio sramvss d[2] qck sda suspend vddio d[7] nc reg3v3 scl porb vv6411 36lcc nc nc vv6411 pin description stv0681+vv6411/6500 44/56 adcs 7283313b 9.2 vv6411 pin description table 19: vv6411 pin description name pin number type description power supplies avss 10 gnd core analogue ground and reference supplies. sramvss 17 gnd in-column sram analogue ground. vddcore/ reg3v3 34 pwr digital logic power. vddio 33 pwr digital pad ring power. vsscore 22 gnd digital logic ground. vssio 23 gnd digital pad ring ground. analogue signals vbg 1 oa internally generated bandgap reference voltage 1.22v ain 4 ia analogue input to audio amplifier aoutp 5 oa analogue output of audio amplifier (positive) aoutn 6 oa analogue output of audio amplifier (negative) vddhi 9 ia incoming power supply 4 -> 6v vbase 35 oa drive for base of external bipolar vbus 36 ia incoming power supply 3.3 -> 6v aud3v3 3 oa on-chip audio amplifier voltage regulator output vid3v3 11 oa on-chip video supply voltage regulator output porb 13 od power-on reset (bar) output. digital video interface d[4] d[3] d[2] d[1] d[0] 27 26 25 24 20 odt tri-stateable 5-wire output data bus. - d[4] is the most significant bit. - d[4:0] have programmable drive strengths 2, 4 and 6 ma qck 32 odt tri-stateable data qualification clock. lst/d[5] 28 odt tri-stateable line start output may be configured as tri-stateable output data bit 5 d[5]. fst/d[6] 29 odt tri-stateable frame start signal. may be configured as tri-stateable output data bit 6 d[6]. d[7] 31 odt tri-stateable data wire (ms data bit). may be configured as tri-stateable output data bit 6 d[6]. oeb 16 id digital output (tri-state) enable. adcs 7283313b 45/56 stv0681+vv6411/6500 vv6411 pin description digital control signals resetb 21 id - system reset. active low. may be configured as system sync. active low. suspend 12 id - usb suspend mode control signal. active high if this feature is not required then the support circuit must pull the pin to ground. the combination of an active high signal and pull up pad was chosen to limit current drawn by the device while in suspend mode. serial interface scl 15 bi - serial bus clock (input only). sda 14 bi - serial bus data (bidirectional, open drain). system clocks clki 30 id schmitt buffered clock input or lvds positive clock input not connected nc 2, 7, 8, 18, 19 not connected key a analogue input d digital input oa analogue output id - digital input with internal pull-up bi bidirectional id digital input with internal pull-down bi - bidirectional with internal pull-up od digital output bi bidirectional with internal pull-down odt tri-stateable digital output table 19: vv6411 pin description name pin number type description vv6411 package mechanical data stv0681+vv6411/6500 46/56 adcs 7283313b 10 vv6411 package mechanical data (36pin lcc) note: 1 die is optically centred 2 refractive index of glass is approx. 1.52 . figure 8: vv6411 36lcc package detail 3.937 ref. typ. pin n1 (co.2) t y p . (0.2 ) 24 32 23 0.178 max. b/f pull back 33 30 1 5 6 14 15 0.7366 typ. 10.668 sq. -0.13 +0.2 8.636 sq. 0.13 7.366 sq. 0.13 a 0.08 0.08 -a- 1.549 0.16 0.5710.05 0.546 0.05 0.55 0.05 0.432 0.05 adcs 7283313b 47/56 stv0681+vv6411/6500 vv6 411 package mechanical data note: 1 die is optically centred 2 refractive index of glass is approx. 1.52 figure 9: vv6411 36lcc package detail r 0.15 ref 36 plcs r 0.15 ref. 4 corners 14 15 23 24 32 33 36 1 6 1.016 typ. 8.128 0.13 0.889 ref. typ. 0.508 typ. pin n1 index 0 . 5 08 ref typ. vv6500 pin description stv0681+vv6411/6500 48/56 adcs 7283313b 11 vv6500 pin description 11.1 vv5500 pinout figure 10: 48 pin lcc package pin assignement reset d[1] d[2] d[3] d[4] vbase vbus vbg nc vddhi nc nc oe suspend 7 8 6 5 4 3 2 1 48 47 46 45 44 42 41 38 9 10 11 12 13 14 15 16 17 19 20 21 22 23 24 25 26 27 28 29 32 33 34 35 36 37 lst/d[5] fst/d[6] clki/clkip d[7] qck aud3v3 aoutp vddcore/reg3v3 40 39 18 30 31 43 nc d[0] aoutn sda por vid3v3 avss ain vsscore vssio scl vddio nc nc nc nc nc nc nc sramvss nc nc nc clkin nc vv6500 48lcc nc adcs 7283313b 49/56 stv0681+vv6411/6500 vv6500 pin description 11.2 vv6500 pin description table 20: vv6500 pin description name pin number type description power supplies avss 11 gnd core analogue ground and reference supplies. sramvss 21 gnd in-column sram analogue ground. vddio 43 pwr digital pad ring power. vsscore 29 gnd digital logic ground. vssio 30 gnd digital pad ring ground. sramvss 21 gnd in-column sram analogue ground. analog signals vbg 1 oa internally generated bandgap reference voltage 1.22v ain 4 ia analogue input to audio amplifier aoutp 5 oa analogue output of audio amplifier (positive) aoutn 6 oa analogue output of audio amplifier (negative) vddhi 9 ia incoming power supply 4 -> 6v vbase 46 oa drive for base of external bipolar vbus 47 ia incoming power supply 3.3 -> 6v vddcore/ reg3v3 45 oa on-chip voltage regulator output aud3v3 3 oa on-chip audio amplifier voltage regulator output vid3v3 12 oa on-chip video supply voltage regulator output porb 16 oa power-on reset (bar) output. vv6500 pin description stv0681+vv6411/6500 50/56 adcs 7283313b digital video interface d[4] d[3] d[2] d[1] d[0] 36 35 34 33 32 odt tri-stateable 5-wire output data bus. - d[4] is the most significant bit. - d[4:0] have programmable drive strengths 2, 4 and 6 ma qck 42 odt tri-stateable data qualification clock. clkin 40 bi - lvds negative clock input lst/d[5] 37 odt tri-stateable line start output may be configured as tri-stateable output data bit 5 d[5]. fst/d[6] 38 odt tri-stateable frame start signal. may be configured as tri-stateable output data bit 6 d[6]. d[7] 41 odt tri-stateable data wire (ms data bit). may be configured as tri-stateable output data bit 6 d[6]. oeb 20 id digital output (tri-state) enable. digital control signals resetb 31 id - system reset. active low. may be configured as system sync. active low. suspend 31 id - usb suspend mode control signal. active high if this feature is not required then the support circuit must pull the pin to ground. the combination of an active high signal and pull up pad was chosen to limit current drawn by the device while in suspend mode. serial interface scl 18 bi - serial bus clock (input only). sda 17 bi - serial bus data (bidirectional, open drain). system clocks clki/clkip 39 id schmitt buffered clock input or lvds positive clock input not connected nc 2, 7, 8, 10, 13, 14, 19, 22-28, 44, 48 not connected table 20: vv6500 pin description name pin number type description adcs 7283313b 51/56 stv0681+vv6411/6500 vv6500 pin description key a analogue input d digital input oa analogue output id - digital input with internal pull-up bi bidirectional id digital input with internal pull-down bi - bidirectional with internal pull-up od digital output bi bidirectional with internal pull-down odt tri-stateable digital output vv6500 package mechanical data stv0681+vv6411/6500 52/56 adcs 7283313b 12 vv6500 package mechanical data figure 11: vv6500 package details 14.22 sq . +0.30 -0.13 11.414 0.13 9.89 0.13 0.33 min. b/f exposure 12.014 0.13 10.490 0.13 0.13 typ. b/fpull back 5.20 ref. typ. 0 . 4 8 t y p . 0 . 2 0 t y p . 0 . 5 0 0.20 ref. x 45 pin n1 1 1 6 6 7 18 19 19 30 30 31 31 42 42 0.02170.002 (0.55 0.05) mp-2 mp-3 0.5710.050 0.546 0.050 1.549 0.16 0.432 0.050 0.08 0.08 a -a- 0.20 typ. 43 48 43 48 adcs 7283313b 53/56 stv0681+vv6411/6500 vv6500 package mechanical data note: 1 die is optically centred 2 refractive index of glass is approx. 1.52 figure 12: vv6500 package details 11.176 0.13 typ. 11.016 0.08 typ. 19 18 7 r0.15 ref. 4 corners r0.15 ref. 48 plcs 6 48 43 31 30 1.02 0.18 typ. 1.52 +0.25 -0.13 typ. pin n1 index diam. 0.51 0.254 evaluation kit (evk) stv0681+vv6411/6500 54/56 adcs 7283313b 13 evaluation kit (evk) stmicroelectronics can supply an evaluation kit for initial evaluation and design-in. the evk includes an stv0681 motherboard pcb and two lensed sensor daughter boards (vv6411 (cif) and vv6500 (vga)). additional motherboards and daughter boards may be ordered separately. the evk pcb includes sdram memory, connectors, numeric lcd display, battery holder, push buttons/switches, audio record and playback circuitry, flashgun interface circuitry, and a flashgun hotshoe connector (to allow the use of a standard camera flashgun). optional pcb links enable alternate functionality, and demonstration software is included, allowing for tethered video, upload to the pc of pictures, sounds, and avi movie clips, and download to the camera of custom sounds. a reference design manual, giving the camera designer everything required for standard features and audio record/playback is available, including schematics, explanatory notes, parts list, and layout advice. 13.1 ordering details note: all evaluation kits include hardware and software support for audio, custom sounds, and flashgun features. table 21: ordering details for stv0681 + vv6411/6500 evaluation kits description part number stv0681 companion processor stv0681 vv6411 cif colour cmos sensor (36lcc package) vv6411c036 vv6500 vga colour cmos sensor (48lcc package) vv6500c001 complete evaluation kit stv0681 complete evaluation kit (includes stv-681-m01, stv-6411c-d01 and stv6500c-d01) stv-681-e01 additional evk components evaluation kit motherboard stv-681-m01 sensor daughter board with vv6411 stv-6411c-d01 sensor daughter board with vv6500 stv-6500c-d01 adcs 7283313b 55/56 stv0681+vv6411/6500 evaluation kit (evk) 13.2 technical support technical support information, such as datasheets, software downloads,etc, for products of the stmicroelectronics imaging division can be found at www.st.com (click on imaging products) general sales/technical enquiries can be directed to regional email contacts: asiapacific.imaging@st.com centraleurope.imaging@st.com france.imaging@st.com japan.imaging@st.com nordic.imaging@st.com southerneurope.imaging@st.com ukeire.imaging@st.com usa.imaging@st.com adcs 7283313b 56/56 stv0681+vv6411/6500 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this p ublication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectron ics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicr oelectronics. the st logo is a registered trademark of stmicroelectronics ? 2002 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - u.s.a. www.st.com |
Price & Availability of STMICROELECTRONICS-VV6500C001
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |