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ScreenCoderTM UR7HCTS2-S840 High-Performance, Low Power Touch Screen Controller/Digitizer
HID & SYSTEM MANAGEMENT PRODUCTS, MOUSECODERTM FAMILY DESCRIPTION The ScreenCoderTM SPI/Serial is a touch screen controller and integrated digitizer IC designed specifically for RISC-based systems, such as wireless Internet appliances. The small, single footprint IC interfaces the system via either the Serial Peripheral Interface (SPI) or Asynchronous Serial Interface. Unlike simple A/D implementations, the ScreenCoderTM SPI/Serial does not require complicated software drivers and no processing burden is placed on the CPU. Due to the IC's superior data processing and sampling rate, the ScreenCoderTM SPI/Serial is ideal for use in systems requiring handwriting recognition. Patented-power management techniques are also implemented so that the IC only consumes 1uA of current most of the time, even with the external mouse connected. The IC operates at 3 to 5 Volts. Features of Semtech's motion algorithm include resistance to RF and other noise which provides smooth and precise motion control. The UR7HCTS2-S840 also works flawlessly with any 4 or 8-wire touch screen, regardless of size or manufacturer. The cost-effective solution requires few external components, allowing for a simple and real estate saving implementation. FEATURES * Touch screen controller / digitizer in a single, small footprint IC * Interfaces the system via either Serial Peripheral Interface (SPI) and Asynchronous Serial Interface * Works with any 4- or 8-wire resistive touch screen, regardless of size, material or vendor * Provides high resolution of 1000 points per axis and a sampling rate of 200Hz * Accurate, quick touch response due to advanced sampling technology and patented algorithms * Zero-PowerTM operation -- IC typically consumes less than 1A * Highly resistant to RF and other noise sources * Uses sophisticated power management for maximum power savings * Offers external PS/2 port for the hot-plug connection of an external PS/2 pointing device * Capable of providing other features, such as battery monitoring and GPIO * PS/2 and USB interfaces available * Available in small 7mm X 7mm 32-pin LQFP package
APPLICATIONS * Wireless Internet Appliances * Handheld PCs (H/PCs) PIN ASSIGNMENTS * Web Phones * Portable Systems
24 25
_RB RSVD2 TxD ISEL/SCLK SOUT _PWR_DOWN SXL SYT
YT2 XL2 RVSD1 XDAT XCLK
_LB XR2 YB2
17 16
_RTS/_SS XL1 YT1
LQFP
YB1 XR1 VSS _OSCOUT OSCIN
32 1
VDD VSS2 _RESET VREF _CTS/_ATN XPWRS SXR SYB
9 8
ScreenCoder, MouseCoder and Self-Power Management are a trademark of Semtech Corp. All other trademarks belong to their respective companies. Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
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ORDERING CODE
Package Options 32-pin, Plastic LQFP Pitch in mm's 0.8 TA=-20 C to +85 C UR7HCTS2-S840-FG
Other Materials ScreenCoderTM SPI/Serial
Type Evaluation Kit
Order number EVK7-TS2-S840-XXX
Note 1: XXX= Denotes Revision number
BLOCK DIAGRAM
Left Button ASI/SPI
Right Button
ASI/SPI Communication port
Switch Interface Power Management Section
Drivers for Touch Screen
Touch Panel Interface 4
Power-On Reset
Sense Line
4
Sensor Interface 16 bit Timer
XCLK
8042 Emulation port Oscillator Circuit
XDAT
OSCIN
_OSCOUT
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
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PIN DEFINITIONS
Mnemonic Pin # VDD 8 VSS 11 VSS2 7 OSCIN 9 Type P P P I Name and Function Power Supply Ground Ground Oscillator Input: external clock input or one side of the Ceramic Resonator with built-in Load Capacitors Oscillator Output: open for external clock input or other side of the Ceramic Resonator with built-in Load Capacitors Reset: apply 0V to provide orderly start-up External Mouse Clock: PS/2 clock signal from external mouse; keep open if unused External Mouse Data: PS/2 data signal from external mouse; keep open if unused Left Button: active low Right Button: active low Sensor's Excitation Driver: connect to X Right Sensor's Excitation Driver:connect toY Bottom Sensor's Excitation Driver:connect to Y Top Sensor's Excitation Driver: connect to X Left Reference Voltage for built-in A/D Sense line: for X Left Sense line: for Y Top Sense line: for Y Bottom Sense line: for X Right Hardware Power Down: tie high if unused External Mouse Power Sense: connect to switched power plane for the external pointing device or tie high if external mouse port is used; tie low if external mouse port is unused Slave Select / Ready To Send: active low, host ready to get data Attention / Clear To Send: active low, request data transfer Data Output: Serial mode Interface Select / SPI Clock: tie low for Serial Data Output: SPI mode Reserved: Keep open
_OSCOUT
10
O
_RESET XCLK XDAT _LB _RB XR1, XR2 12, YB1, YB2 13, YT1, YT1 14, XL1, XL2 15, VREF SXL SYT SYB SXR _PWR_DOWN XPWRS
6 17 18 24 25 23 22 21 20 5 31 32 1 2 30 3
I I/O (nd) I/O (nd) I/O (nd) I/O (nd) I/O I/O I/O I/O AI AI AI AI AI I AI
_SS/_RTS _ATN/_CTS TXD SCLK/ISEL SOUT RSVD1-2
16 4 27 28 29 19,26
I O O I I/O I/O
Note: An underscore before a pin mnemonic denotes an active low signal. Pin Types Legend: AI=Analog Input; I=Input; O=Output; I/O=Input or Output; I/O (nd)=Input or Output with N-channel Open Drain driver
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
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FUNCTIONAL DESCRIPTION The UR7HCTS2-S840 consists functionally of five major sections (see the Functional Diagram). These are the Sensor Interface, Power Management section, the 16-Bit Timer, the Oscillator Circuit and the Serial Peripheral Interface (SPI) and the Asynchronous Serial Interface (Serial). All sections communication with each other and operate concurrently. OSCILLATOR This IC has a built-in Oscillator circuit capable of operations with an external 4.00 MHz Clock source, or a Ceramic Resonator (preferably with built-in Load Capacitors). Note, that the Crystals can NOT be used. The ScreenCoderTM SPI/Serial frequently switches its Oscillator OFF and ON in order to operate with the least amount of power consumption. Due to very high Q, the Crystal-based oscillators have exceedingly long Start-up time and can not be used with the ScreenCoderTM SPI/Serial . EXTERNAL PS/2 INTERFACE There is one external PS/2 port for the connection of standard PS/2 devices, including a Microsoft WheelMouse or 5-Button Mouse. The mouse motion data is sent out in relative format. The external PS/2 port also supports hotplug; users can connect the mouse to the system at any time without rebooting. POWER MANAGEMENT The ScreenCoderTM SPI/Serial implements two power management methods: Self-Power ManagementTM and System-coordinated Power Management.
Self-Power ManagementTM
Self-Power ManagementTM is a method implemented by the IC that, independently of any system intervention, results in the lowest power consumption possible within the present parameters of its operation. Through SelfPower ManagementTM, the IC is capable of typically operating at only 1uA, independently of the state of the Host system. Self-Power ManagementTM primarily determines the actual power consumption of the IC. When the host is in the active state, the IC can still operate most of the time at only 1uA, even when an active external PS/2 device is attached to it. Self-Power ManagementTM offers three modes of operation: Stop, Run and Wait. "Stop" mode is the lowest power consumption mode. In this mode, the oscillator is stopped and the IC consumes only the leakage current. This is the default mode to which the IC will revert when it is idle. "Wait" mode is entered when the IC is waiting for a response or continuation of data stream from the PS/2 device. The duration of wait mode is limited to 40ms, within which time the IC will either receive new data from the PS/2 device or enter "Stop" mode. Typical power consumption in this mode is several hundred uAs. "Run" mode is entered briefly, only to process an event. The IC will only remain in this mode when there are pending tasks, such as PS/2 report reception or initialization of the PS/2 device.
System Request To Send, Mouse hot plug or Data Packet, Touch Screen activity, Button press
Figure 1: Self-Power ManagementTM State
RUN
STOP
1s of inactivity
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POWER MANAGEMENT (CON'T)
System-coordinated Power Management
Figure 2: System-coordinated Power Management
Normal Operation State:
Critical Suspend
In normal operation state, both the _PWR_DOWN and XPWRS pins are in high state. The ScreenCoderTM SPI/Serial operations are controlled by Self-Power ManagementTM.
_PWR_DOWN=0
_PWR_DOWN=0
_PWR_DOWN=1 and XPWRS=0
_PWR_DOWN=1 and XPWRS=1
Critical Suspend:
At any time, the Host may negate the _PWR_DOWN pin in order to force the ScreenCoderTM SPI/Serial into a "critical suspend" mode. This signal can be activated (driven low) due to specific conditions of the Host's operations (for example, a discharged battery), or due to actions of the Operating System or BIOS. During the "critical suspend", the ScreenCoderTM SPI/Serial will shut down all of the pointing activities.
Ext Mouse power down _PWR_DOWN=1 and XPWRS=0 Normal State
_PWR_DOWN=1 and XPWRS=1
TOUCH SCREEN SENSOR INTERFACE The ScreenCoderTM SPI/Serial can acquire data from any four- or eight-wire resistive touch screen sensors. The sensor interface has the following features:
Touch detection
The IC periodically checks touch pressure applied to the panel. If there is no touch, the IC will not perform measurements and will not send data to system. When touch pressure is detected, the IC further qualifies and determines the amount of pressure. Semtech's proprietary, patent-pending touch detection algorithm performs this test very quickly, accommodating sensors with various plate-to-plate capacitances.
External PS/2 power down:
The ScreenCoderTM SPI/Serial monitors the state of the power supply rail for the external PS/2 pointing device through the XPWRS pin. If the IC senses that the external PS/2 device has been powereddown by the host, it will actively eliminate shot-through current in the input buffers for the clock and data lines by driving both low. The ScreenCoderTM SPI/Serial will reinitialize the external PS/2 pointing device when the power to the external PS/2 port is restored.
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TOUCH SCREEN SENSOR INTERFACE (CON'T)
Touch Measurement
Position information is only collected if it has been determined that the touch pressure is sufficient for an accurate reading. To obtain position information from the Resistive Touch Screen Sensor, the ScreenCoderTM SPI/Serial uses four internal drivers (two pins for each driver) and four sense lines. During sampling, the drivers of the X-axis are activated by setting one X-drive high and the other X-drive low. The drivers for Y-axis are set floating. This action produces a voltage gradient across the touch screen's surface in the X direction. The internal A/D measures both the voltage across the activated X-plane and the voltage potential between the planes. Next, the drivers for the Yaxis are activated while the drivers for X-axis are set floating. Again, the internal A/D measures both voltage across the activated plane and potential between the planes. The X and Y absolute position is obtained from these four A/D measurements. The IC keeps measuring the touch pressure even while the positioning data is acquired. If insufficient touch pressure is detected during sampling of the position, the current data set will be rejected.
Touch algorithm
Due to vibration and electrical noise, the raw data can not be used directly. Internal data processing delivers consistent position accuracy and quick touch response.
Resolution
The ScreenCoderTM SPI/Serial uses a built-in A/D converter to get the touch position. The maximum absolute position resolution is 1000 points per direction. Resolution varies somewhat for different touch screen sensors, due to voltage droop on connecting wires and sensor's mechanical construction.
Touch screen from different makers
Operating parameters for the touch screens from different manufacturers vary depending on the size of the sensor, material it is made from, and mechanical construction. The ScreenCoderTM SPI/Serial takes these properties into account, and adjusts automatically for plate-to-plate capacitance, intrinsic plate resistances, etc.
Touch-screen's coordinates
The zero point for the touchscreen is at the left upper corner. See the diagram to the right.
(0,0) X
Buttons
The ScreenCoderTM SPI/Serial implements left and right buttons. The buttons information is combined with external mouse's buttons information when it is sent to the system. Typically, the buttons are not used, they are provided as a development aid.
Y
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SERIAL PERIPHERAL INTERFACE (SPI) AND ASYNCHRONOUS SERIAL INTERFACE (SERIAL) The ScreenCoderTM SPI/Serial supports either Serial Peripheral Interface (SPI) or Asynchronous Serial Interface (Serial) communication based on the power-up setting of the ISEL/SCLK pin. To select the Asynchronous Serial Interface, connect ISCL/SCLK to VSS. For SPI interface, SCLK must idle high. ABSOLUTE MODE PACKAGE FORMAT
Byte # 7 1 1 2 3 4 0 0 0 6 0 Mouse Y9 X6 Y6 5 0 Absolute Y8 X5 Y5 Bit Number 4 3 0 0 1 penup 1 penup Y7 X* X4 X3 Y4 Y3 2 0 1 penup X9 X2 Y2 1 0 0 0 1 penup 1 penup X8 X7 X1 X0 Y1 Y0
RELATIVE MODE PACKAGE FORMAT
Data Packet Format for ScreenCoderTM SPI/Serial
The ScreenCoderTM SPI/Serial has two different types of mouse packages. One type is for absolute position data from the touch screen sensor and one is for relative data from the external PS/2 device. For both the Relative and Absolute mode package format, each packet contains 4 bytes. The 7th bit of each byte is used for synchronization. The 7th bit for the first byte is 1 and for the other bytes is 0. The resolution for absolute position is 10 bits (approximately 1000 points in X and Y directions.) The relative mouse data format supports operations with WheelMouse and 5-button mice.
Byte # 7 1 1 2 3 4 0 0 0
6 0 Mouse X6 Y6 X*
5 1 Relative X5 Y5 B5
Bit Number 4 3 Ysign Xsign X4 Y4 B4 X3 Y3 Z3
2 M X2 Y2 Z2
1 R X1 Y1 Z1
0 L X0 Y0 Z0
Note 2: The bits that are marked with X* are reserved for future use. Now the value given is zero. Note 3: The X / Y data from external mouse is 9 bits. In our report, we truncate it to 8 bits. The reduction is based on the fact that X / Y increments are seldom beyond the range of +127/-128. For mouse data that exceeds this range, the ScreenCoderTM SPI/Serial will give +127/-128.V8-V0: Revision Hex 40 (Current Revision here)
IDENTIFICATION AND REVISION REPORT PACKAGE FORMAT
Byte # 7 1 1 2 0 3 0 4 0 (See Note 4 below) 6 0 F4 P2 V6 5 0 V8 P1 V5 Bit Number 4 3 0 0 V7 C3 P0 F3 V4 V3 2 0 C2 F2 V2 1 0 C1 F1 V1 0 1 C0 F0 V0
Identification and Revision for ScreenCoderTM SPI/Serial
The UR7HCTS2-S840 offers a special identification and revision package. This package uses the absolute mode format, but will not appear in the normal absolute mode. For normal absolute mode, the first byte will be 80 Hex or 9F Hex. This special 4-byte package is identified by the first byte, 81 Hex. This data package is sent upon power-up.
Note 4: C3-C0: Class ID F4-F0: Family ID P2-P0: Sub Product Family V8-V0: Revision
Hex Hex Hex Hex
7 A 1 40
UR7HC TS2 S840 (Current Revision here)
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ASYNCHRONOUS SERIAL INTERFACE (ASI) MODE
Baud rate:
The ScreenCoderTM SPI/Serial transmits data at 19200 Baud, using the recommended 4MHz oscillator.
Protocol:
In Serial mode, the ScreenCoderTM SPI/Serial supports transmission in one direction only (IC to Host). The IC starts the transmission to the system when it has mouse/keyboard package pending. The data format is one start bit, 8 data bits, no parity and one stop bit. 1. The ScreenCoderTM SPI/Serial asserts _CTS low to indicate that a packet transfer will start. 2. The Host asserts _RTS low to indicate that it is ready to receive data. _RTS low means that system can receive data (e.g. UART is operational). 3. The UR7HCTS2-S840 places data on TXD line when it detects the _RTS low. 4. When one package is successfully transmitted, the IC raises _CTS.
Notes on the Protocol:
To assure fast transmission, the system must assert _RTS low as soon as possible. If the system is ready to receive the data, it doesn't have to raise _RTS between packages. The UR7HCTS2-S840 checks _RTS after every byte transmission. If _RTS returns to high, it means that the transmission was unsuccessful. The IC will raise _CTS to abort the transmission and the entire package will be retransmitted. The maximum time of T1 is 10ms. If the system cannot assert _RTS low after 10ms of _CTS low, the IC will raise _CTS to abort the transmission request. After that, the ScreenCoderTM SPI/Serial will try to start the transmission again.
_CTS
_RTS
TXD
1st Byte
Last Byte
t1
Figure 1: Serial Transmission Timing
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SERIAL PERIPHERAL INTERFACE (SPI) MODE The Serial Peripheral Interface (SPI) is a synchronous bi-directional multi-slave protocol. In SPI mode, the ScreenCoderTM SPI/Serial acts as a slave device. The IC only supports transmission and doesn't support receiving. SPI data transfer can be performed at a maximum clock rate of 500 KHz. The SDATA pin outputs data every time the transfer clock changes from high to low level.
Protocol:
1. The UR7HCTS2-S840 asserts _ATN low to indicate that a mouse packet is waiting for transfer. 2. The Host asserts _SS low to indicate that it is ready to receive data. _SS low means the system selected SPI ScreenCoderTM SPI/Serial as its communication device. 3. On detecting _SS low, the IC enables the SPI interface and places data in the SPI data TX buffer. After a short delay, the system supplies eight clocks to get the data from the IC. The minimum time t2 from _SS low to first SPI clock is 50us. 4. When a byte is transferred successfully, the system has to wait a minimum of 50us to begin the clocks for next byte transmission. 5. When the mouse package is transmitted, the system stops the SPI clock. If it needs to communicate with other SPI devices, it has to wait for _ATN return to high. _ATN high means the SPI port of UR7HCTS2-S840 is now in high Impedance State.
_ATN
_SS
SCLK
SDATA
1st Byte
2nd Byte
Last Byte
t4
t1
t2
t3
Figure 2: SPI Transmission Timing: (_SS toggles for every package).
Notes on the Protocol:
To assure the fast transmission, system must assert _SS low as soon as possible, see Figure 2. If the system is ready to get data, it doesn't have to raise _SS between packages, see Figure 3.
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PROTOCOLS FOR THE UR7HCTS2-S840 IN SPI MODE (CON'T)
SPI Communication Timing Parameters
Symbol t1 t2 t2' t3 t4 Description _ATN low to _SS low _SS low to first clock (_SS toggles for every package) _ATN low to first clock (_SS low) Last clock of transmitted byte to next byte's first clock Last byte TX finish to _ATN to high Min 50 50 50 Max 10 5000 5000 5000 30 Units ms us us us us
t2
_ATN
_SS
SCLK
SDATA
1st Byte
2nd Byte
Last Byte
t3
t4
Figure 3: SPI Packet Transmission Timing: (_SS low always).
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24
23
22
21
20
19
18
17
LB
XL2
YB2
RVSD1
7
25 RB
U1
XL1 15 14 13 YT1 YB1
RTS/SS
16
8
PWR_ON 31 SXL SYT SYB SXR XPWRS CTS/ATN VREF RESET VSS2 VDD GND Y1 4.00MHz VDD OSCIN 9 OSCOUT 32 10
30 PWR_DOWN VSS
ASI Interface
11
2
4
6
8
1
2
3
4
5
6
7
RN1 4.7K 1 3 5 7
8
C1 SXL .1uF 10uF
C2
C3
10nF +/-10% X7R GND SYT U2 TC54VC4502ECB NOT_RESET SYB 1 GND GND
C4
VDD 2
10nF +/-10% X7R
C5
C6 SXR
GND
SUGGESTED INTERFACING FOR THE SCREENCODERTM SPI/SERIAL UR7HCTS2-S840-FG IN SERIAL MODE
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EXT_POWER_SENSE
10nF +/-10% X7R
EXT_PS2_VDD
GND
NOTES:
( C ) 2 0 0 0 U S A R S y s t e ms, A Semtech Company S c r e e n C o d e r I I U R 7 H CTS2-S840-FG SCI Interface D o c ument Number UR7HCTS2S820 Rev 0.60 VM
S840 == SCI/SPI Out, 4.00 MHz, 8/4- wire, Model 0. Connect Drive and Sense lines together for the 4-wire Sensor. Y1 == 4.00 MHz Ceramic Resonator with Built-in Load Capacitors. Crystals can NOT be used.
3
10nF +/-10% X7R
SHIEL D
11
XR2 YT2 XDAT XCLK 26 RSVD2 TXD 27 28 ISEL/SCLK GND 29 SOUT XR1 12
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
EXT_PS2_VDD SW2 L1 12uH EXT_M_DATA GND See Note s JP1 MDIN6_SH 6 4 2 5 3 1 GND 47pF XL YT YB XR EXT_M_CLOCK GND RIGHT BUTTON C7 C8
SW1
LEFT BUTTON
DRV_XL DRV_YT DRV_YB DRV_XR
SENSE_XL SENSE_YT SENSE_YB SENSE_XR
_RTS
TXD
U R7HCTS2-S840 32-pin LQFP
47pF Mounti ng holes
_CTS
24
23
22
21
20
19
18
17
LB
XL2
YB2
RVSD1
XDAT
XCLK
SENSE_XL SENSE_YT SENSE_YB SENSE_XR 2 XR2 YT2 25 RB 26 RSVD2 TXD ISEL/SCLK SOUT PWR_DOWN SXL SYT SYB SXR XPWRS CTS/ATN VREF RESET VSS2 VDD GND Y1 4.00MHz VDD OSCIN 9 OSCOUT 10 VSS 11 XR1 12 YB1 13 YT1 14 XL1 27 28 29 30 31 32
7
PWR_ON
2
4
6
8
1
2
3
4
5
6
7
RN1 4.7K 1 3 5 7
8
C1 SXL .1uF 10uF
C2
C3
10nF +/-10% X7R GND SYT U2 TC54VC4502ECB NOT_RESET SYB 1 GND GND
C4
VDD 2
10nF +/-10% X7R
C5
C6 SXR
GND
10nF +/-10% X7R
EXT_POWER_SENSE
EXT_PS2_VDD
SUGGESTED INTERFACING FOR THE SCREENCODERTM SPI/SERIAL UR7HCTS2-S840-FG IN SPI MODE
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GND
NOTES:
( C ) 2 0 0 0 U S A R S y s t ems, A Semtech Company S c r e e n C o d e r I I U R 7 H C T S 2-S840-FG SPI Interface D o c u ment Number UR7HCTS2S840.sch Rev 0.60
S840 == SCI/SPI Out, 4.00 MHz, 8/4- wire, Model 0. Connect Drive and Sense lines together for the 4-wire Sensor. Y1 == 4.00 MHz Ceramic Resonator with Built-in Load Capacitors. Crystals can NOT be used.
3
10nF +/-10% X7R
SHIEL D
12
U1
15 RTS/SS 16
8
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
EXT_PS2_VDD SW2 L1 12uH EXT_M_DATA GND See Note s JP1 MDIN6_SH 6 4 5 3 1 GND 47pF XL YT YB XR EXT_M_CLOCK GND RIGHT BUTTON C7 C8 47pF Mounti ng holes
SW1
LEFT BUTTON
DRV_XL DRV_YT DRV_YB DRV_XR
_SS
_ATN
SCLK
SOUT
UR7HCTS2_S840 32-pin LQFP SPI Interface
MECHANICAL INFORMATION FOR THE FG PACKAGE
HD D
32 25
e
F
1 24
y b
8
17
L1
9
16
Symbol
c
L Detail F
A
MD e
A A1 A2 b c D E e HD HE L L1 y b2 I2 MD ME
I2 Recommended PCB Footprint
Dimension in Millimeters Min Nom Max - - 1.7 0.1 0.2 0 1.4 - - 0.3 0.35 0.45 0.105 0.125 0.175 6.9 7.0 7.1 6.9 7.0 7.1 0.8 - - 8.8 9.0 9.2 8.8 9.0 9.2 0.3 0.5 0.7 1.0 - - 0.1 - - 0 10 - 0.5 - - - - 1.0 - - 7.4 - - 7.4
A1
A2
b2
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
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E HE
ELECTRICAL SPECIFICATIONS
Absolute Maximum Ratings Ratings Supply Voltage Input Voltage Current Drain per Pin (not including Vss or Vdd) Operating Temperature UR7HCTS2-S840 Storage Temperature Range Symbol Vdd Vin I Ta Tstg Value -0.3 to 7.0 Vss -0.3 to Vdd +0.3 20 T low to T high -20 to +85 -40 to +125 Unit V V mA C C C
DC Electrical Characteristics, Temperature range=T low to T high unless otherwise noted) Characteristic Symbol Min Typ Max Supply Voltage 3.0 5.0 5.5 Output Voltage (10 A load) Voh Vdd-0.1 Vol 0.1 Input High Voltage Vih 0.8 x Vdd Vdd Input Low Voltage Vil Vss 0.2xVdd Input Current Iin +/- 10 Supply Current (Vdd=5.0 Vdc+/-10%, Vss=0) Idd 3.0 TBD
Unit V V V V A mA
Control Timing (Vdd=5.0 Vdc +/-10%, Vss=0 Vdc, Temperature range=T low to T high unless otherwise noted) Characteristic Symbol Min Typ Max Unit Frequency of Operation fosc MHz Ceramic Resonator Option 4.0 External Clock Option 4.0
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SCREENCODERTM SPI/SERIAL BILL OF MATERIALS FOR PAGE 12 SCHEMATIC
UR7HCTS2-S840-FG BOM Description Quantity Bare PCB: PCB1 1 Capacitor: C1, C4 2 C2, C3, C7, C8 4 C5, C10 2 C6, C9 2 C11-C14 4 Custom IC: U1 1 U4 1 ICs: U2 1 U3, U5 2 Inductor: L1 1 Push Button: Left, Right 2 Resistor Network: RN1 1 Resistor: R1 1 R2 1 R3 1 Resonator: Y1, Y2 2 Manufacturer USAR Generic Generic Generic Generic Generic USAR USAR Analog Devices TelCom Generic Generic Part# PCB7-TS2-S840-060 Any Any Any Any Any UR7HCTS2-S840-FG UR6HCASI-S40T-FB ADM232LJR TC54VC4302EMB Any Any Description SPI/Serial Touchscreen PCB 47pF, 10%, Ceramic, X7R or NPO, SMT Size 1206 1uF, 16V, Tantalum Cap, SMT, Size 1206 10uF, 20V, Tantalum Cap, SMT, Size C .1uF Ceramic Chip Cap, Z5U, SMT, 1206 .01uF, Ceramic Chip Cap, SMT, NPO, or X7R, 1206 SPI/Serial ScreenCoderTM Controller SPI to Serial Test Chip 232 Driver_Receiver Chip in SMT 4.3V, Volt Detector, THD, TO-83 12uH Inductor, SMT, 1210 (3225) Switch, 8mm, light touch, THD
CTS Generic Generic Generic AVX
744-083-472J Any Any Any PBRC-4.00BR
4.7K, 4 Resistor, 8 terminals, SMT 4.7K Resistor, 5% Thick Film, SMT, 1206 10K Resistor, 5% Thick Film, SMT, 1206 1M Resistor, 5% Thick Film, SMT, 1206 4.00MHz Resonator, SMT
Note: Auxiliary components are not shown.
Revised 08/24/00
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For sales information and product literature, contact: HID & System Mgmt Division Semtech Corporation 568 Broadway New York, NY 10012 usar@semtech.com http://www.semtech.com 212 226 2042 Telephone 212 226 3215 Telefax
Semtech Western Regional Sales 805-498-2111 Telephone 805-498-3804 Telefax Semtech Central Regional Sales 972-437-0380 Telephone 972-437-0381 Telefax Semtech Eastern Regional Sales 203-964-1766 Telephone 203-964-1755 Telefax Semtech Asia-Pacific Sales Office +886-2-2748-3380 Telephone +886-2-2748-3390 Telefax Semtech Japan Sales Office +81-45-948-5925 Telephone +81-45-948-5930 Telefax Semtech Korea Sales Sales +82-2-527-4377 Telephone +82-2-527-4376 Telefax Northern European Sales Office +44 (0)2380-769008 Telephone +44 (0)2380-768612 Telefax Southern European Sales Office +33 (0)1 69-28-22-00 Telephone +33 (0)1 69-28-12-98 Telefax Central European Sales Office +49 (0)8161 140 123 Telephone +49 (0)8161 140 124 Telefax
Copyright 2000-2001 Semtech Corporation. All rights reserved. MouseCoder, ScreenCoder and Self-Power Management are trademarks of Semtech Corporation. Semtech is a registered trademark of Semtech Company. All other trademarks belong to their respective companies. INTELLECTUAL PROPERTY DISCLAIMER This specification is provided "as is" with no warranties whatsoever including any warranty of merchantability, fitness for any particular purpose, or any warranty otherwise arising out of any proposal, specification or sample. A license is hereby granted to reproduce and distribute this specification for internal use only. No other license, expressed or implied to any other intellectual property rights is granted or intended hereby. Authors of this specification disclaim any liability, including liability for infringement of proprietary rights, relating to the implementation of information in this specification. Authors of this specification also do not warrant or represent that such implementation(s) will not infringe such rights.
Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102
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