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ScreenCoderTM UR7HCTS2-P840 High-Performance, Low Power PS/2 Touch Screen Controller/Digitizer
HID & SYSTEM MANAGEMENT PRODUCTS, MOUSECODERTM FAMILY DESCRIPTION The ScreenCoderTM PS2 is a highperformance IC that interfaces any 4 or 8-wire resistive touch screen to the standard PS/2 mouse port. Low-power and tiny, the single IC is ideal for portable systems, web phones and interactive kiosks. It offers an advanced algorithm for enhanced motion control as well as an extra port for hot-plug connection of an external PS/2 pointing device. Both the touch screen and the external device can be operated concurrently without any penalty. The UR7HCTS2-P840 is equipped with a special command protocol that enables the touch screen to operate in either relative (mouselike) or absolute positioning mode. Because the IC interfaces via the PS/2 mouse port, it can utilize any standard mouse driver when operating in relative mode. For absolute positioning, offers a highfunctionality driver which includes inking capabilities. Mice connected to the ScreenCoderTM PS2 external mouse port will always act in relative mode, even if the touch screen is operating in the absolute mode. The PS/2 communication channel is bi-directional at 10 kbps.
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FEATURES * Controller & digitizer in a single IC; no need for external A/D * Interfaces ANY 4- or 8-wire resistive touch screen to standard PS/2 mouse port; regardless of size, material or vendor * High-performance IC offers accurate cursor control due to advanced algorithms * Low-power consumption, due to sophisticated power management states, ideal for battery-operated systems * Highly resistant to RF & other noise sources * Enables hot-plug connection of an external pointing device * Wheelmouse functionality is supported in the external pointing device * Other interfaces available * Embedded touch screen and external pointing device can operate concurrently with no performance penalty * Supports both absolute and relative (mouse-like) modes of operation * For relative mode, no special drivers are needed; highfunctionality driver available for absolute mode * Supports all commands defined in the IBM PS/2 Mouse Communication Protocol, as well as Semtech's extended PS/2 communication protocol with absolute positioning support * Available in a low-profile 32-pin LQFP package * Few external components required
APPLICATIONS * Portable systems * Notebooks and Laptops PIN ASSIGNMENTS
RB RSVD2 RSVD3 RSVD4 RSVD5 POWER_DOWN SXL SYT
32 25 24
* Interactive Kiosks * Touch-enabled monitors
The ScreenCoder PS2 offers builtin A/D. Touch detection and motion are handled in firmware, and no digitizer is required. The cost-effective solution requires few external components, allowing for a simple and real estate saving implementation.
TM
SYB SXR XPWRS RSVD1 VREF RESET VSS2 VDD
8 9 16 17
LB XR2 YB2 YT2 XL2 HDAT XDAT XCLK
ScreenCoder and MouseCoder are trademarks of Semtech Corporation. All other trademarks belong to their respective companies.
Copyright (c)1999-2001 Semtech Corporation DOC7-TS2-P840-DS-106
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OCSIN OSCOUT VSS XR1 YB1 YT1 XL1 HCLK
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ORDERING CODE
Package Options 32-pin, Plastic LQFP Pitch in mm's 0.5 TA=-20 C to +85 C UR7HCTS2-P840-FG
Other Materials ScreenCoderTM PS2 Eval. Kit
Type Evaluation Kit
Order number EVK7-TS2-P840-XXX
Note 1: XXX= Denotes Revision number
BLOCK DIAGRAM
Left Button
Right Button
PWR_DOWN Power Management XPWRS Switch Interface
HCLK PS/2 Communication Port HDAT
X Input
4
Drivers for Touch Screen Sensor
Y Input
Sense Lines
4
XCLK 8042 Emulation Port XDAT
Control
Sensor Interface
16 bit Timer Power-On Reset Oscillator Circuit
OSCIN
OSCOUT
Copyright (c)1999-2001 Semtech Corporation DOC7-TS2-P840-DS-106
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PIN DEFINITIONS
Mnemonic VDD VSS VSS2 OSCIN Pin # 8 11 7 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 Mouse Data: connects to Host's data line Mouse Clock: connects to Host's clock line 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, strobed sampling Right Button: active low, strobed sampling Sensor's Excitation Driver: connect to X Right Sensor's Excitation Driver: connect to Y Bottom Sensor's Excitation Driver: connect to Y Top Sensor's Excitation Driver: connect to X Left Sensor's Excitation Driver: connect to X Left Sensor's Excitation Driver: connect to Y Top Sensor's Excitation Driver: connect to Y Bottom Sensor's Excitation Driver: connect to X Right 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: tie high if unused and external mouse port is used; tie low if external mouse port is unused Reserved
_OSCOUT
10
O
_RESET HDAT HCLK XCLK XDAT _LB _RB XR1 YB1 YT1 XL1 XL2 YT2 YB2 XR2 VREF SXL SYT SYB SXR _POWER_ DOWN XPWRS
6 19 16 17 18 24 25 12 13 14 15 20 21 22 23 5 31 32 1 2 30 3
I I/O (nd) I/O (nd) I/O (nd) I/O (nd) I/O (nd) I/O (nd) I/O I/O I/O I/O I/O I/O I/O I/O AI AI AI AI AI I AI
RSVD1-5
4, 26 27-29
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 (c)1999-2001 Semtech Corporation DOC7-TS2-P840-DS-106
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FUNCTIONAL DESCRIPTION The ScreenCoderTM UR7HCTS2-P840 consists functionally of six major sections (see the Functional Diagram on page 2). These are the Sensor Interface, Power Management section, the 16-Bit Timer, the Oscillator Circuit, the PS/2 Communication Port and the 8042 Emulation Port. All sections communicate with each other and operate concurrently. SENSOR INTERFACE To obtain position information from the Resistive Touch Screen Sensor, the ScreenCoderTM PS2 uses four internal drivers (two pins for each driver) and four sensing lines. During sampling, first the drivers and sensing lines for X axis are activated, by setting one X driver high and the other X driver 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 Y axis are activated, while the drivers for the 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 information is calculated from these four A/D measurements. Before the measurement of X and Y positions, the ScreenCoderTM PS2 checks if there is any touch pressure applied to the sensor. Proprietary touch detection algorithm performs this test very quickly, accommodating sensors with various plate-to-plate capacitances. Actual measurements are somewhat more complex and are covered by a US and international patent currently pending. 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 PS2 frequently switches its Oscillator OFF and ON in order to operate with the least amount of power consumption. Due to their very high Q, the Crystal-based oscillators have exceedingly long Start-up times and can NOT be used with the ScreenCoderTM PS2. PS/2 COMMUNICATION At start-up, or upon receiving a reset command, the UR7HCTS2-P840 will wait between 300 and 500 milliseconds before sending an AAh to the Host followed by a device ID of 00h. The IC will then set itself to its default values (i.e., Incremental Stream Mode with 1:1 scaling, and a report rate of 100 Hz). The device will then disable itself until an Enable (F4h) command is sent from the Host. ERROR HANDLING For every correct command or parameter received from the Host, the UR7HCTS2-P840 sends an Acknowledge (FAh). If an invalid command or parameter is received, the UR7HCTS2-P840 issues a Resend Request (FEh). If an invalid input is again received, the device transmits an Error Code (FCh) to the Host. Both Error and Resend Request responses are sent by the device within 25 milliseconds. Host may not issue any new commands until either the ScreenCoderTM PS2 has responded or until 25 milliseconds have elapsed. POWER MANAGEMENT The ScreenCoderTM PS2 implements two power management methods: Self-Power ManagementTM and System-coordinated Power Management.
Self-Power Management Self-Power ManagementTM of the ScreenCoderTM PS2 permits, independently of any system intervention, the lowest power consumption possible within the present parameters and conditions of operation. Through Self-Power ManagementTM, the ScreenCoderTM PS2 is capable of operating - most of the time - at only 1uA, independently of the state of the system.
Copyright (c)1999-2001 Semtech Corporation DOC7-TS2-P840-DS-106
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POWER MANAGEMENT (CON'T) The "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. An event or signal conditions wake-up the IC. The ScreenCoderTM PS2 can still operate most of the time at only 1uA, even when the host is in the active state, and with active external PS/2 device attached to the ScreenCoderTM PS2. If an external PS/2 device sends a data packet, the ScreenCoderTM PS2 will exit the "Stop" mode for as long as it takes to process the message and relay the information to the system. This operation is done transparently to the host, without any data loss or any response delay from the input device.
Figure 1: Semtech's Self-Power ManagementTM State
System Request To Send, Mouse hot plug or Data Packet, Touch Screen activity, Button press
RUN
STOP
1s of inactivity
POWER MANAGEMENT (CON'T) During the "Critical suspend", the ScreenCoderTM will shut down all of the pointing activities. However, the communications with the Host are still enabled.
External PS/2 power down The ScreenCoderTM PS2 monitors the power state of the external PS/2 pointing device through the XPWRS pin. If the IC senses that the external PS/2 device has been powered-down 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 UR7HCTS2-P840 will re-initialize the external PS/2 pointing device when the power to the external PS/2 port is restored. Figure 2: Semtech's System-coordinated Power Management
System-coordinated Power Management
Normal Operation State In normal operation state, both _PWR_DOWN and XPWRS pins are in high state. ScreenCoderTM PS2 operations are controlled by SelfPower ManagementTM. Critical Suspend At any time, the Host may negate the _PWR_DOWN pin in order to force the ScreenCoderTM PS2 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.
Critical Suspend
_PWR_DOWN=0 _PWR_DOWN=1 and XPWRS=0
_PWR_DOWN=0 _PWR_DOWN=1 and XPWRS=1
Ext Mouse power down
_PWR_DOWN=1 and XPWRS=0 Normal State
_PWR_DOWN=1 and XPWRS=1
Copyright (c)1999-2001 Semtech Corporation DOC7-TS2-P840-DS-106
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PS/2 DATA FORMAT The following table shows the data report format. X and Y values are expressed as 9-bit Two's Complement signed integers, with the sign bit / most significant bit separate. If there is an overflow of the accumulator, the maximum positive or negative count is reported and the corresponding overflow bit is set. EXTENDED PS/2 PROTOCOL Semtech offers a high-performance driver for Windows 95, Windows 98, Windows Me, and Windows NT. Please check with Semtech for other driver availability. Those that wish to undertake their own driver development will need to request from Semtech the document covering the extended PS/2 protocol used by the UR7HCTS2-P840.
DATA REPORT FORMAT TABLE
Byte 1 b0 b1 b2 b3 b4 b5 b6 b7 Byte 2 b0 b1 b2 b3 b4 b5 b6 b7 Byte 3 b0 Y0: LSb of Y data b1 Y1 b2 Y2 b3 Y3 b4 Y4 b5 Y5 b6 Y6 b7 Y7: Byte 4 (only for Wheelmouse-type devices) b0 Z0: LSb of Z data b1 Z1 b2 Z2 b3 Z3 b4 Z4 b5 Z5 b6 Z6 b7 Z7: MSb of Z data X0: LSb of X data X1 X2 X3 X4 X5 X6 X7: Left Button status Right Button Status Middle Button Status Reserved X8: MSb of X data, sign bit Y8: MSb of Y data, sign bit X data overflow Y data overflow 1 = depressed 1 = depressed 1 = depressed Always = 1 1 = negative 1 = negative 1 = overflow 1 = overflow
STATUS REPORT FORMAT TABLE
Byte 1 b0 b1 b2 b3 b4 b5 b6 b7 Byte 2 b0 - 1 b2 - 7 Byte 3 b0-7 Current sampling rate Current resolution setting Always = 0 Right Button Middle Button Left Button Reserved Scaling - 1:1 (0) / 2:1 (1) Disable - (0) / enable (1) Stream - (0) / prompt (1) mode 1 = depressed 1 = depressed 1 = depressed Always = 0
Always = 0
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PS/2 MODE COMMANDS When the Reset Command (FFh) is received, the UR7HCTS2-P840 sets the following default parameters: Incremental Stream Mode, 1:1 scaling, report rate of 100 Hz, and disabled. It then sends AAh to the host followed by a device ID of 00h. The Host sends the Resend Last
Data Stream Command (FEh)
The Reset Echo Mode Command (ECh) returns the device to its previous mode, and disabled. The Set Prompt (Remote) Mode Command (F0h) sets the device to Prompt Mode. Data values are then only reported in response to a
Read Report Command (EBh).
The Read Report Command (EBh) prompts the ScreenCoderTM PS2 for a report. The report occurs even if the device has not moved or if the status of the switches did not change. The Set Incremental Stream Mode Command (EAh) sets the ScreenCoderTM PS2 to Stream Mode and disables the device. The Status Request Command (E9h) returns a 3-byte status report. The Set Resolution Command (E8h) controls resolution, the Set
2:1 Scaling Command (E7h)
when the host detects an error in any UR7HCTS2-P840 transmission. The device then resends the last output data packet to the Host. This transmission occurs after a ScreenCoderTM PS2 transmission and before the Host enables the interface allowing the next ScreenCoderTM PS2 output. The Set Default Status Command (F6h) re-initializes the device to its condition at power-up. The Disable Command (F5h) stops the device from transmitting all reports. However, the mode does not change; the ScreenCoderTM PS2 is still able to respond to commands. If the Disable Command is issued while the device is transmitting a report, the UR7HCTS2-P840 immediately stops the transmission and disables itself.
If the Set Echo Mode Command (EEh) is received, the ScreenCoderTM PS2 will immediately return any data bytes except FFh or ECh. If the ScreenCoderTM PS2 is in Incremental Stream Mode, the Enable Command (F4h) will allow it to begin data transmission. If the device is in Prompt Mode, the Enable Command will only update the internal status of the ScreenCoderTM PS2. The ScreenCoderTM PS2 will respond to the Set Sampling Rate Command (F3h) in both Stream and Prompt Modes but will only update its internal status if this command is enacted while the device is in the Stream Mode. The UR7HCTS2-P840 responds to the Read Device Type Command (F2h) with the device ID of 00h.
enables a coarse/fine tracking response, and the Set 1:1 Scaling Command (E6h) enables the values of movements to be transmitted to the Host without any scaling. Due to Semtech's Advanced Motion Algorithm, Set Resolution and Scaling Commands are acknowledged and reported as activated, but their status is ignored.
Copyright (c)1999-2001 Semtech Corporation DOC7-TS2-P840-DS-106
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SEQUENTIAL COMMANDS Unlike normal commands, sequential commands must be enacted with a sequence of commands. If the sequence is not consecutive or is incorrect, the ScreenCoderTM PS2 aborts the detection and responds the way it would normally respond to a command. The individual commands that comprise a sequential command have been designed so that the elements of a sequential command can be sent to the ScreenCoderTM PS2 via the standard IBM PS/2 BIOS calls and the device returns a valid response to the Status Request. This ensures that, if the sequential command is sent via the BIOS, the status response will be accurately returned even if the BIOS performs error detection. Thus, a programmer can have complete control of the mouse without having to access the device hardware port directly. The UR7HCTS2-P840 implements a special sequential command that can be used to determine its ability to report three buttons. The sequential command is a series of commands to the ScreenCoderTM PS2 that cause the device to respond to the last command (Read Status) with alternate information. The sequence of commands is as follows.
1. 2. 3. 4. 5. Set Resolution = one count/ mm Set Scaling = 1:1 Set Scaling = 1:1 Set Scaling = 1:1 Read Status (E8H) (E6H) (E6H) (E6H) (E9H)
The response to the Read Status Command is in the following format.
Byte 1: Standard Status Information (buttons, scaling, etc.) Byte 2: Number of mouse buttons (3) Byte 3: Firmware Revision Number (encoded) or current sampling rate
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SCREENCODERTM PS2 ABSOLUTE AND RELATIVE POSITIONING MODES OF OPERATION The ScreenCoderTM PS2 supports both absolute and relative positioning modes. Details on how to use the IC in each mode are specified below.cri ABSOLUTE POSITIONING MODE To enable the ScreenCoderTM PS2 to operate in an absolute positioning mode, a ScreenCoderTM PS2 driver, or a driver compliant to the Semtech's Extended PS/2 protocol, must be installed. ScreenCoderTM PS2 drivers are available for use under Windows 95, Windows 98, Windows Me, and Windows NT. Other operating systems are also supported; please call Semtech for details. For Commands and Data Report organization, please refer to the Semtech Extended PS/2 Protocol with Absolute Positioning Mode Support document. RELATIVE POSITIONING MODE In relative positioning mode, the ScreenCoderTM PS2 operates like a normal mouse, using a standard system mouse driver. Button functionality can be achieved as follows: actual switches will act as left and right buttons, or a tap on the screen will act as a left-button click. By tapping on the touchscreen, the user can invoke click, double-click, and click-and-drag functions. To click, lightly and quickly tap the surface of the touchscreen once. To double click, rapidly tap on the touchscreen twice. To click and drag, double-tap rapidly and hold your finger down on the second tap, then glide to move.
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Copyright (c)1999-2001 Semtech Corporation DOC7-TS2-P840-DS-106
SUGGESTED INTERFACING FOR THE SCREENCODERTM PS2 UR7HCTS2-P840-FG
EXT_PS2_VDD
SW1
LEFT BUTTON
SW2
RIGHT BUTTON GND GND EXT_M_CLOCK XL YT YB XR 6 2 4 L B 25 26 27 28 29 RB RSVD2 RSVD3 UR7HCTS2_P840 RSVD4 32-pin LQFP RSVD5 PWR_DOWN SXL SYT S Y B S X R 2 X P W R S 3 R S V D 1 4 V R E F 5 R E S E T 6 V S S 2 7 XR1 VSS YB1 2 3 X R 2 2 2 Y B 2 2 1 Y T 2 2 0 X L 2 1 9 H D A T 1 8 X D A T 1 7 X C L K HCLK 16 XL1 15 YT1 14 13 12 11 Mounting holes 4 2 7 M_CLOCK 8 M_DATA EXT_M_DATA
L1
12uH
See Notes DRV_XL DRV_YT DRV_YB DRV_XR SENSE_XL SENSE_YT SENSE_YB SENSE_XR
JP3
MDIN6_SH 5 3 1
C7
47pF
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GND
C8
47pF
U1
PWR_ON
30 31 32
OSCOUT 10 OSCIN 9 V D D 8
Y1
4.00MHz
GND VDD VDD M_DATA 1 2 3 4 5 GND
RN1
10k
2 1
4 3
6 5
8 7 SXL
1
JP2
C3
10nF +/-10% X7R
C1
.1uF GND GND
C2
10uF GND VDD
M_CLOCK
PS/2 DATA SHIELD GND +5V PS/2CLOCK
S5B_PH_K
C4
10nF +/-10% X7R
SYT
TC54VC4502ECB NOT_RESET SYB 1
U2
2
C5
10nF +/-10% X7R
REF VALUE C1 .1uF C3-C6 10nF RN1 10K REF Y1 VALUE 4.00 MHz
TOLERANCE OTHER DATA ANY CERAMIC ANY +/-10% CERAMIC X7R +/-5% ANY PART#, MFG PBRC-4.00BR, AVX
3 SXR EXT_POWER_SENSE GND
C6
10nF +/-10% X7R GND
(C)2000 USAR Systems, A Semtech Company EXT_PS2_VDD 568 BROADWAY NEW YORK, NY 10012 Ph 212.226.2042 Fax 212.226.3215 ScreenCoder II UR7HCTS2-P840-FG UR7HCTS2P840 Rev 0.8
NOTES:
P840 == PS/2 In/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.
SCREENCODERTM PS2 EVALUATION BOARD MECHANICAL
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VDD
SW1
X_PS2_PWR M_DATA 12uH EXT_M_DATA GND EXT_M_CLOCK GND GND CON_SIP3 RIGHT BUTTON 1 2 3
SW2 L1
JP5
SEE NOTES
LEFT BUTTON
JP1 JP6
MDIN6_SH 6 47pF 4 CON_SIP3 2 GND 7 M_CLOCK 8 1 GND 3 5
CON_2X5
Copyright (c)1999-2001 Semtech Corporation DOC7-TS2-P840-DS-106
JP3 C7
JP7
CON_SIP8 VDD 25 RB RSVD2 RSVD3 YT1 UR7HCTS2_P840 RSVD4 YB1 32-pin LQFP RSVD5 XR1 VSS OSCOUT 10 OSCIN 9 V S S 2 V D D 11 PWR_DOWN SXL SYT S Y B S X R X P W R S R E S E T R SV VR DE 1F 12 13 Mounting holes 14 26 L B X R 2 Y B 2 Y T 2 X L 2 H D A T X D A T 2 4 2 3 2 2 2 1 2 0 1 9 1 8 1 7
1 2 3 4 5 6 7 8 9 10 1 2 3
Y_T SYT X_L SXL Y_B SYB X_R SXR
SUGGESTED EVALUATION BOARD INTERFACING FOR THE SCREENCODERTM PS2 UR7HCTS2-P840-FG
12
U1
27 28 29 30 31 32 GND 1 2 3 4 5 6 7 8
GND
X C L K HCLK 16 XL1 15
C8
47pF
JP4
VDD
1 2 3
CON_SIP3
GND
Y1
4.00MHz VDD
GND VDD M_DATA
RN1
5 FXL .1uF GND GND FYT NOT_RESET 1 3 GND FYB 2 10uF VDD GND 7
2 1 6 7 8 2 3 4 5
4
6
8
JP2
M_CLOCK 1 2 3 4 5 GND
10k
1
3
C3 C1 C2
PS/2 DATA SHIELD GND +5V PS/2CLOCK S5B_PH_K
10nF
C4
10nF
C5 U2
TC54VC4502ECB FXR
10nF
REF C1 C3-C6 RN1 REF Y1
VALUE TOLERANCE OTHER DATA .1uF ANY CERAMIC ANY 10nF +/-10% CERAMIC X7R 10K +/-5% ANY VALUE PART NUMBER/MFG 4.00 MHz PBRC-4.00BR/AVX
C6
10nF
(C)2000 USAR Systems, A Semtech Company 568 BROADWAY NEW YORK, NY 10012 Ph 212.226.2042 Fax 212.226.3215 EVB for ScreenCoder II UR7HCTS2-P840-FG UR7HCTS2EVB.sch Rev 0.8
GND
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NOTES:
P840 == PS/2 In/Out, 8/4-wire, 4.00 MHz, Model 0. The PCB is pre-configured for the 4-wire Sensor. For the 8-wire Sensor cut the jumpers beteen the Drive and the Sense lines, change JP1. Traces of the jumpers are located on the Bottom (Solder) side of the PCB, between the pins of JP1.
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
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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-P840 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 Crystal Option 4.0 External Clock Option 4.0
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SCREENCODERTM PS2 BILL OF MATERIALS FOR PAGE 10 SCHEMATIC
UR7HCTS2-P840-FG BOM Description Quantity Capacitors: C1 1 C2 1 C3, C4, C5, C6 4 C7, C8 2 ICs: U1 1 U2 1 Resistor Network RN1 1 Resonator: Y1 1 Inductor L1 1 Manufacturer Generic Generic Generic Generic Semtech Telcom Part# Any Any Any Any UR7HCTS2-P840-FG TC54VC4502ECB Description .1uF, 10%, Ceramic, X7R or Z5U 10uF, 10V, +80%/-20%, Tantalum 10nF, 10%, Ceramic, X7R 47pF, 10%, Ceramic, X7R ScreenCoderTM PS/2 Controller Reset IC
Generic AVX Generic
Any PBRC-4.00BR Any
10K, 4 independent resistors 4.00MHz Ceramic Resonator w/ Caps, SMT 12uH Inductor
Note: Auxillary components are not shown.
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For sales information and product literature, contact: HID & System Mgmt Division Semtech Corporation 568 Broadway New York, NY 10012 hidinfo@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 (c)1999-2001 Semtech Corporation. All rights reserved. MouseCoder, ScreenCoder and Self-Power Management are trademarks of Semtech Corporation. Semtech is a registered trademark of Semtech Corporation. 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 (c)1999-2001 Semtech Corporation DOC7-TS2-P840-DS-106
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