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| PAC207BCA a ll rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 1 p ixart ima g in g inc. e-mail: fae_service@pixart.com.tw v1.2, july. 2003 pac207b single-chip cif cmos image sensor with usb interface 1. general description the pac207b is a single chip cmos image senso r embedded with an usb 1.1 interface and image compression function. the pac207b is suitabl e for low-cost high performance pc camera applications. it integrates on-chip power regulators to transfer the 5v voltage from usb host power to proper voltage levels to supply the cmos sensor an d analog and digital circuitry. hence there is no need to have external power regulator on the p cb. all the image processing functions, interpolation, auto exposure, auto white balance, de-flickering and sharpness, are performed by software in pc side. the optical size is 1/7?, which can easily be em bedded into lcd monitors, notebooks or pda. key specification of electrical and optics power supply: +5v (default) sensor array: 352 x 288. frame rate: up to 30fps. pixel size: 5.6um x 5.6um. crystal frequency: 12mhz(default) s/n ratio: 35db. power consumption: < 25ma. pga gain: 31.6 db max sensitivity: 190 level/l ux-sec (green pixel) exposure time: frame time ~ 1/160000 optical format: 1/7? color filter: rgb bayer pattern scan mode: progressive package: 32-pin lcc
pixart imaging inc. PAC207BCA single-chip cif cmos image sensor with usb a ll rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 2 p ixart imaging inc. e-mail: fae_service@pixart.com.tw v1.3, june. 2004 2. features 12mhz or 6mhz crystal in for on- chip pll, to generate 48mhz embedded 1/7?, 5.6um x 5.6um cif cmos imag e sensor, with 0.25um process technology on-chip 10-bit adc programmable sensor control through usb control pipe. support video data transfer through usb isochronous pipe. snapshot control through usb interrupt pipe. frame rate: - up to 24fps @cif format (352x288) with lossy compression, with 8 mbps usb bandwidth - up to 24fps @qvga format (320x240) with lossy compression, with 8 mbps usb bandwidth - up to 30fps @qcif format (176x144) without compression, with 5.6~6 mbps usb bandwidth - up to 30fps @qqvga format (160x120) without compression, with 5.6~6 mbps usb bandwidth auxiliary image processing: - synchronized color gain setting and gain parameter control. - exposure measurement report (cente r area & outer area of window). output frame number identify, full frame identify, ae/ag updating identify, compression codebook reassignment identify. supported usb suspend mode usb vendor id, product id, device release number , maximum power consumption and string descriptor can be set by a serial eeprom (93c46a 16bit) or by metal mask. usb 5v power in, on-chip 3.3v regulator for se nsor, on-chip 2.5v regulator for core logic 6 io-trapping pins to set product id a nd max power consumption (100ma or 500ma). embed micro-wire controller to support exte rnal eeprom (93c46a 16bit) for customized vendor id, product id, device release number, max power consumption, product string, manufacturer string, sensor parameters, etc. single power supply from usb cable package: 32 pin, dimension: 9mm x 9mm power consumption: < 25ma pixart imaging inc. PAC207BCA single-chip cif cmos image sensor with usb a ll rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 3 p ixart imaging inc. e-mail: fae_service@pixart.com.tw v1.3, june. 2004 3. block diagram $ * ' 4 f o t p s 4 f o t p s $ p o u s p m m f s 6 4 # $ p o u s p m m f s 7 7 7 7 1 - - 3 b u f $ p o u s p m 3 f h j t u f s # b o l * n b h f d p n q s f t t j p o pac207b is a single-chip usb camera. it incl udes a cif sensor based on pixart pas106 with enhanced image quality and sensitivity, a 48mhz pll, internal regulators, proprietary image compression, image processing schemed, control regi sters, on-chip sram for image data buffer and usb controller. all register parameters are set by usb interface. and the compressed image data is transmitted by usb 1.1 isochronous pipe. pixart imaging inc. PAC207BCA single-chip cif cmos image sensor with usb a ll rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 4 p ixart imaging inc. e-mail: fae_service@pixart.com.tw v1.3, june. 2004 4. pin assignment pin no. name type description 7 4 4 " gnd analog gnd 7 3 # bypass analog voltage reference 7 $ . bypass analog voltage reference 7 3 5 bypass analog voltage reference 7 e e b z pwr sensor readout power 7 e e b z pwr sensor reset power 7 4 4 " : gnd sensor gnd & 1 3 @ % 0 i data output of eeprom; (io trap pin for pid4) & 1 3 @ 4 , o serial clock for eeprom; (io trap pin for pid3) & 1 3 @ % * o data input of eeprom; (io trap pin for pid1) 1 * % i (io trap pin for pid0) - & % o led driver; (io trap pin for ma x power select, 0/1: 500ma/100ma) 9 u b m i bios selection of crystal oscillator circuit & 1 3 @ & o ) i enable signal of eeprom * 0 5 s b q @ & o - i i/o trap enable signal (0: enable, 1: disable) & 1 3 @ $ 4 o chip select of eeprom; (io trap pin for pid2) 7 4 4 " gnd analog ground 7 % % . pwr main power, (5v when on-chip regulator enable) 7 % % 1 bypass power for core logic, 2.5v , & : i snapshot control signal (active low) 5 f t u @ & o ) i test mode enable, ?1? to enable 3 4 5 i rst_ when p-cam power-up 7 4 4 2 gnd ground for i/o and phy % / bi- dn for usb1.1 phy 7 % % 2 pwr power for i/o and phy % 1 bi- dp for usb1.1 phy 9 * / clk crystal in 9 0 6 5 clk crystal out 7 % % 1 pwr analog power for pll, bypass when internal regulator enable. 7 % % % pwr logic power for mixed-mode circuit, bypass when internal regulator 7 % % " pwr analog power for ad/da/pga, bypass when internal regulator enable 7 % % . pwr main power, (5v when on-chip regulator enable) pixart imaging inc. PAC207BCA single-chip cif cmos image sensor with usb a ll rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 5 p ixart imaging inc. e-mail: fae_service@pixart.com.tw v1.3, june. 2004 5. functional description 5.1 analog data path c j u n 7 % " $ e b d < > ( m p c b m h b j o c j u t c j u q j q f m j o f e " % $ 9 $ p m p s h b j o # ( ( 3 c j u t 9 9 4 f o t p s " s s b z $ % 4 $ p m % f d p e f s t 3 p x % f d p e f s t 9 ' s p o u h b j o c j u t t u f q d p e f < > pac207b embedded a high quality cmos image sensor with pixart advanced sensor structure. with correlated-double-sampling (cds ) circuit, it cancelled the column-wise fixed pattern noise (fpn) and pixel mismatch at se nsing node for each pixel. hence pac207b can deliever a clean image quality. with a progressive scanning timing, the analog pi xel signal is transferre d into ?front-gain? stage. then transferred the pre-amplifier an alog signal into programmable gain amplifier (pga). then adc will convert the analog signal into a 10 bit digital code. the gain stage can be set by digital register setting, please refer to the following equation to get the mapping gain. front gain = 2+(n/2), n = 0, 1, 2, 3 color gain = 1+(m/8), m= 0, 1, 2, ?15 global gain = 1+(q/10), q = 0, 1, 2, ?31 pixart imaging inc. PAC207BCA single-chip cif cmos image sensor with usb a ll rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 6 p ixart imaging inc. e-mail: fae_service@pixart.com.tw v1.3, june. 2004 5.2 image compression pac207b utilize the pixart pr oprietary compression algorith m to maintain the balance between image quality and frame rate. pac207b also supported a unique frame sync & frame header identity, which indicates the frame star t information and the frame properties, then followed a compressed data line by line. operation modes 1. excellent quality 2. high quality 3. normal quality 4. high compression 5. bandwidth release decision priority of co mpression mode selection the pac207b utilized a multiple mode image co mpression algorithm with an advanced rate control scheme to get the best image quality under different usb bandwidth or image complexity. by setting the register of address 66~74, the pac207 can adjust the data rate of compressed image date while maintain a good image quality. when cmos sensor running at a slow frame rate as low-luminance condition, the compression can easily switch to raw data mode, which has minimum compression errors. 5.3 usb video iso_in alternate setting alternate setting 0 1 2 3 4 5 6 7 8 max packet size (bytes) of iso-in pipe 0 128 256 384 512 640 768 896 1023 when the device is plugged, the driver will allocate bandwidth by usb host controller status. the ?alternate setting? and ?max packet size of iso-in pipe? will be set as much as possible depend on the available bandwidth .the alternat e-setting table is show n all bandwidth option above. pixart imaging inc. PAC207BCA single-chip cif cmos image sensor with usb a ll rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 7 p ixart imaging inc. e-mail: fae_service@pixart.com.tw v1.3, june. 2004 5.3 power on sequence 5 x s t 5 s t u 5 j p u . j o 5 z q j d b m . b y 5 x s t 8 b j u 3 f h v m b u p s 4 u b c m f 5 j n f n t 5 s t u 3 f t f u 5 j n f n t n t n t 5 j p u * 0 5 s b q 4 f u v q 5 j n f o t 6 4 # 7 7 % % . 7 % % 2 7 % % " 7 % % % 7 % % 1 7 % % q 3 f t f u * 0 5 s b q - p b e 7 pixart imaging inc. PAC207BCA single-chip cif cmos image sensor with usb a ll rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 8 p ixart imaging inc. e-mail: fae_service@pixart.com.tw v1.3, june. 2004 6. dc and ac characterisitcs absolute maximum ratings symbol parameter min max unit vddm dc supply voltage -0.5 5.5 v vin dc input voltage 0.5 3.8 v vout dc output voltage -0.5 3.8 v tstg storage temperature 0 70 dc electrical characteristics (vdd=3.3v5%, ta=0c~40c ) symbol parameter min. typ. max. unit type :pwr vddm main power from usb cable 4.5 5.0 5.5 v idd operating current 20 25 30 ma type :in & i/o reset and sysclk vih input voltage high 2.0 vddq v vil input voltage low 0 0.8 v cin input capacitor 10 pf ilkg input leakage current 1.0 ua type : out & i/o for pxd0:9, pxclk, h/vsync & sda, load 10pf, 1.2k ? , 3.3volts voh output voltage high vddq-0.2 v vol output voltage low 0.2 v ac operating condition symbol parameter min. typ. max. unit fsysclk master clock frequency 6 12 24 mhz fpxclk pixel clock rate 3 4 mhz sensor characteristics (light source: 3200k halogen lamp; 8bit resolutions ) parameter symbol min. typ. max. unit note photo response non-uniformity prnu 1.87 % saturation output voltage vsat. 235 level dark output voltage vdark 2.15 level/sec dark signal non-uniformity dsnu 0.56 level sensitivity ( red channel ) r 240 level/lux-sec sensitivity ( green channel ) g 190 level/lux-sec sensitivity ( blue channel ) b 150 level/lux-sec pixart imaging inc. PAC207BCA single-chip cif cmos image sensor with usb a ll rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 9 p ixart imaging inc. e-mail: fae_service@pixart.com.tw v1.3, june. 2004 7. package information 7.1. package outline dimension all dimensions are in millimeters. pixart imaging inc. PAC207BCA single-chip cif cmos image sensor with usb a ll rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 10 p ixart imaging inc. e-mail: fae_service@pixart.com.tw v1.3, june. 2004 7.2. optical center information -- top view -- note: sensor array center = package center pixart imaging inc. PAC207BCA single-chip cif cmos image sensor with usb a ll rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 11 p ixart imaging inc. e-mail: fae_service@pixart.com.tw v1.3, june. 2004 8. reference application circuit vdday2 vddd vssay key# vssq r5 27 ohm vcm vddq dp r2 51k c21 1uf 1 2 y1 12mhz c4 0.1uf xtal_out c14 0.1uf c7 10pf vssa vdda c3 10uf c5 10pf vdday2 c16 1uf vdday1 vcm rst# by charles / pixart imaging inc. v2.2 PAC207BCA-32 pc-cam demo board schematic (use default setting) b 22 monday, june 14, 2004 title size document number rev date: sheet of vrt l1 3.3uh led xtal_in u1 PAC207BCA-32 1 2 3 4 6 7 8 9 10 12 13 14 15 16 17 18 19 20 22 23 24 25 26 27 28 29 30 31 32 5 11 21 vssa vrb vcm vrt vdday1 vssay epr_do epr_sk epr_di led xtal_sel0 epr_enh iotrap_enl epr_cs vssa vddm vdd2p5 key# rst# vssq dn vddq dp xtal_in xtal_out vddp vddd vdda vddm vdday2 pid0 test_enh c19 20pf 1 2 usb connector & circuit r3 1.5k c20 1uf vddm vssq c2 0.1uf vddm vssa r1 1k c18 20pf 1 2 con1 mini usb 5p 3 2 1 6 9 7 8 4 5 + - +5v hc1 hc4 hc2 hc3 gnd1 gnd2 vssay dn r6 27 ohm c1 10uf vssq c17 1uf c12 0.1uf l2 3.3uh c9 10uf vrt xtal_out vssq vddq c15 1uf c10 0.1uf c6 1uf vddp vddm l5 mlb-201209-1000r-s2 1 2 vdd2p5 vssq vssa dn bypass caps. u2 key xtal_in vddq r4 0ohm 1 2 led c13 1uf vddp vdd2p5 d1 led-0603 1 2 vdday1 dp c11 1uf rst# vrb c8 1uf vddm vssq vrb key# vddq vddq vdda vddd |
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