Datasheet UR7HCTS2-P840-FG Datasheet (Semtech)

1

8

9

32

25

24

16

17

SYB SXR

XPWRS

RSVD1

VREF

RESET

VSS2

VDD

LB XR2 YB2 YT2 XL2 HDAT XDAT XCLK

OCSIN

OSCOUT

VSS

XR1

YB1

YT1

XL1

HCLK

RB

RSVD2

RSVD3

RSVD4

RSVD5

POWER_DOWN

SXL

SYT

• Portable systems

• Notebooks and Laptops

• Interactive Kiosks

• Touch-enabled monitors

The ScreenCoderTMPS2 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 ScreenCoder

TM

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.

The ScreenCoderTMPS2 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.

• 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

• 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

APPLICATIONS

PIN ASSIGNMENTS

DESCRIPTION FEATURES

ScreenCoderTMUR7HCTS2-P840

High-Performance, Low Power PS/2

Touch Screen Controller/Digitizer

ScreenCoder and MouseCoder are trademarks of Semtech Corporation. All other trademarks belong to their respective companies.

www.semtech.com

1

HID & SYSTEM MANAGEMENT PRODUCTS, MOUSECODERTMFAMILY

Package Options Pitch in mm’s TA=-20° C to +85° C

32-pin, Plastic LQFP 0.5 UR7HCTS2-P840-FG

Other Materials Type Order number

ScreenCoderTMPS2 Eval. Kit Evaluation Kit EVK7-TS2-P840-XXX

Note 1: XXX= Denotes Revision number

ORDERING CODE

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2

Power Management

PS/2 Communication Port

8042 Emulation Port

PWR_DOWN

XPWRS

HCLK

HDAT

XCLK

XDAT

Sensor Interface

Oscillator Circuit

Power-On Reset

Switch Interface

X Input

Y Input

Control

OSCOUT

16 bit Timer

Drivers for

Touch Screen

Sensor

Sense Lines

4

Left Button

Right Button

4

OSCIN

BLOCK DIAGRAM

PIN DEFINITIONS

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3

Mnemonic Pin # Type Name and Function

VDD 8 P Power Supply VSS 11 P Ground VSS2 7 P Ground OSCIN 9 I Oscillator Input: external clock input or one

side of the Ceramic Resonator with built-in Load Capacitors

_OSCOUT 10 O Oscillator Output: open for external clock

input or other side of the Ceramic Resonator with built-in Load Capacitors

_RESET 6 I Reset: apply 0V to provide orderly start-up HDAT 19 I/O (nd) Mouse Data: connects to Host’s data line HCLK 16 I/O (nd) Mouse Clock: connects to Host’s clock line XCLK 17 I/O (nd) External Mouse Clock: PS/2 clock signal from

external mouse; keep open if unused

XDAT 18 I/O (nd) External Mouse Data: PS/2 data signal from

external mouse; keep open if unused

_LB 24 I/O (nd) Left Button: active low, strobed sampling _RB 25 I/O (nd) Right Button: active low, strobed sampling XR1 12 I/O Sensor’s Excitation Driver: connect to X Right YB1 13 I/O Sensor’s Excitation Driver: connect to Y Bottom YT1 14 I/O Sensor’s Excitation Driver: connect to Y Top XL1 15 I/O Sensor’s Excitation Driver: connect to X Left XL2 20 I/O Sensor’s Excitation Driver: connect to X Left YT2 21 I/O Sensor’s Excitation Driver: connect to Y Top YB2 22 I/O Sensor’s Excitation Driver: connect to Y Bottom XR2 23 I/O Sensor’s Excitation Driver: connect to X Right VREF 5 AI Reference Voltage for built-in A/D SXL 31 AI Sense line: for X Left SYT 32 AI Sense line: for Y Top SYB 1 AI Sense line: for Y Bottom SXR 2 AI Sense line: for X Right _POWER_ Hardware Power Down: tie high if unused DOWN 30 I XPWRS 3 AI External Mouse Power Sense: tie high if unused

and external mouse port is used; tie low if external mouse port is unused

RSVD1-5 4, 26 I/O Reserved

27-29

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

FUNCTIONAL DESCRIPTION

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4

The ScreenCoderTMUR7HCTS2-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.

To obtain position information from the Resistive Touch Screen Sensor, the ScreenCoderTMPS2 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 ScreenCoder

TM

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.

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 ScreenCoder

TM

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 ScreenCoder

TM

PS2.

SENSOR INTERFACE OSCILLATOR

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.

PS/2 COMMUNICATION

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 ScreenCoderTMPS2 has responded or until 25 milliseconds have elapsed.

ERROR HANDLING

POWER MANAGEMENT

The ScreenCoderTMPS2 implements two power management methods: Self-Power Management

TM

and System-coordinated Power Management.

Self-Power Management

Self-Power ManagementTMof the ScreenCoderTMPS2 permits, independently of any system intervention, the lowest power consumption possible within the present parameters and conditions of operation. Through Self-Power ManagementTM, the ScreenCoderTMPS2 is capable of operating - most of the time - at only 1uA, independently of the state of the system.

POWER MANAGEMENT (CON’T)

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5

During the "Critical suspend", the ScreenCoderTMwill shut down all of the pointing activities. However, the communications with the Host are still enabled.

External PS/2 power down

The ScreenCoderTMPS2 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 ScreenCoder

TM

UR7HCTS2-P840 will re-initialize the external PS/2

pointing device when the power to the external PS/2 port is restored.

Figure 1: Semtech’s Self-Power ManagementTMState

RUN

STOP

System Request To Send,

Mouse hot plug or Data Packet,

Touch Screen activity,

Button press

1s of inactivity

Critical Suspend

Ext Mouse

power down

Normal State

_PWR_DOWN=0

_PWR_DOWN=1 and XPWRS=1

_PWR_DOWN=0

_PWR_DOWN=1 and XPWRS=1

_PWR_DOWN=1 and XPWRS=0

Figure 2: Semtech’s System-coordinated Power Management

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 ScreenCoderTMPS2 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 ScreenCoderTMPS2. If an external PS/2 device sends a data packet, the ScreenCoderTMPS2 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.

System-coordinated Power Management

Normal Operation State

In normal operation state, both _PWR_DOWN and XPWRS pins are in high state. ScreenCoderTMPS2 operations are controlled by SelfPower ManagementTM.

Critical Suspend

At any time, the Host may negate the _PWR_DOWN pin in order to force the ScreenCoderTMPS2 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.

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6

PS/2 DATA FORMAT DATA REPORT FORMAT TABLE

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.

Byte 1

b0 Left Button status 1 = depressed b1 Right Button Status 1 = depressed b2 Middle Button Status 1 = depressed b3 Reserved Always = 1 b4 X8: MSb of X data, sign bit 1 = negative b5 Y8: MSb of Y data, sign bit 1 = negative b6 X data overflow 1 = overflow b7 Y data overflow 1 = overflow

Byte 2

b0 X0: LSb of X data b1 X1 b2 X2 b3 X3 b4 X4 b5 X5 b6 X6 b7 X7:

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

Byte 1

b0 Right Button 1 = depressed b1 Middle Button 1 = depressed b2 Left Button 1 = depressed b3 Reserved Always = 0 b4 Scaling - 1:1 (0) / 2:1 (1) b5 Disable - (0) / enable (1) b6 Stream - (0) / prompt (1) mode b7 Always = 0

Byte 2

b0 - 1 Current resolution setting b2 - 7 Always = 0

Byte 3

b0-7 Current sampling rate

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.

EXTENDED PS/2 PROTOCOL

STATUS REPORT FORMAT TABLE

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7

PS/2 MODE COMMANDS

The Read Report Command

(EBh)

prompts the ScreenCoder

TM

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 ScreenCoderTMPS2 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)

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.

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)

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 ScreenCoderTMPS2 transmission and before the Host enables the interface allowing the next ScreenCoderTMPS2 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 ScreenCoderTMPS2 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.

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).

If the Set Echo Mode Command

(EEh)

is received, the ScreenCoderTMPS2 will immediately return any data bytes except FFh or ECh.

If the ScreenCoderTMPS2 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 ScreenCoderTMPS2.

The ScreenCoderTMPS2 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.

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8

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 ScreenCoderTMPS2 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 ScreenCoderTMPS2 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 ScreenCoderTMPS2 that cause the device to respond to the last command (Read Status) with alternate information.

The sequence of commands is as follows.

1. Set Resolution = one count/ mm (E8H)

2. Set Scaling = 1:1 (E6H)

3. Set Scaling = 1:1 (E6H)

4. Set Scaling = 1:1 (E6H)

5. Read Status (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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SCREENCODERTMPS2 ABSOLUTE AND RELATIVE POSITIONING MODES OF OPERATION

The ScreenCoderTMPS2 supports both absolute and relative positioning modes. Details on how to use the IC in each mode are specified below.cri

In relative positioning mode, the ScreenCoderTMPS2 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.

To enable the ScreenCoderTMPS2 to operate in an absolute positioning mode, a ScreenCoder

TM

PS2 driver, or a driver compliant to the Semtech’s Extended PS/2 protocol, must be installed. ScreenCoderTMPS2 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.

ABSOLUTE POSITIONING MODE RELATIVE POSITIONING MODE

DOC7-TS2-P840-DS-106

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10

SUGGESTED INTERFACING FOR THE SCREENCODER

TM

PS2 UR7HCTS2-P840-FG

UR7HCTS2P840 Rev 0.8

ScreenCoder II UR7HCTS2-P840-FG

Ph 212.226.2042 Fax 212.226.3215

NEW YORK, NY 10012

568 BROADWAY

6

4

2

5

3

1

78

JP3

MDIN6_SH

L1

12uH

C7

47pF

EXT_PS2_VDD

M_DATA

EXT_M_CLOCK

EXT_M_DATA

XL

YB

YT

XR

GND

SW2

RIGHT BUTTON

GND

SW1

LEFT BUTTON

DRV_XL

DRV_YB

DRV_YT

DRV_XR

SENSE_XL

See Notes

SENSE_YB

SENSE_YT

SENSE_XR

PWR_ON

S Y B

1

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

V D D

8

OSCIN

9

OSCOUT

10

VSS

11

XR1

12

YB1

13

YT1

14

XL1

15

HCLK

16

X C L K

1 7

X D A T

1 8

H D A T

1 9

X L 2

2 0

Y T 2

2 1

Y B 2

2 2

X R 2

2 3

L B

2 4

RB

25

RSVD2

26

RSVD3

27

RSVD4

28

RSVD5

29

PWR_DOWN

30

SXL

31

SYT

32

U1

UR7HCTS2_P840

32-pin LQFP

Y1

4.00MHz

M_CLOCK

Mounting

holes

GND

C8

47pF

PS/2 DATA SHIELD GND +5V PS/2CLOCK

1 2 3 4 5

JP2

S5B_PH_K

M_DATA

M_CLOCK

VDD

GND

1

2

3

U2

TC54VC4502ECB

C2

10uF

VDD

GND

C3-C6 10nF +/-10% CERAMIC X7R

C1 .1uF ANY CERAMIC ANY

REF VALUE TOLERANCE OTHER DATA

C1

.1uF

GND GND

SXL

SYT

1357

8642

RN1

10k

C3

10nF

+/-10% X7R

C4

10nF

+/-10% X7R

SYB

SXR

NOTES:

GND

Connect Drive and Sense lines together for the 4-wire Sensor. Y1 == 4.00 MHz Ceramic Resonator with Built-in Load Capacitors.

P840 == PS/2 In/Out, 4.00 MHz, 8/4-wire, Model 0.

Crystals can NOT be used.

C5

10nF

+/-10% X7R

C6

10nF

+/-10% X7R

NOT_RESET

EXT_POWER_SENSE

GND

EXT_PS2_VDD

RN1 10K +/-5% ANY

Y1 4.00 MHz PBRC-4.00BR, AVX

REF VALUE PART#, MFG

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11

SCREENCODERTMPS2 EVALUATION BOARD MECHANICAL

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12

SUGGESTED EVALUATION BOARD INTERFACING FOR THE SCREENCODERTMPS2 UR7HCTS2-P840-FG

UR7HCTS2EVB.sch Rev 0.8

EVB for ScreenCoder II UR7HCTS2-P840-FG

Ph 212.226.2042 Fax 212.226.3215

NEW YORK, NY 10012

568 BROADWAY

6

4

2

531

78

JP3

MDIN6_SH

L1

12uH

C7

47pF

GND

VDD

1

2

3

JP5

CON_SIP3

M_DATA

EXT_M_CLOCK

EXT_M_DATA

X_PS2_PWR

123

JP6

CON_SIP3

GND

SW2

RIGHT BUTTON

GND

SW1

LEFT BUTTON

Y_T

SYT

X_L

SXL

Y_B

SYB

123456789

10

JP1

CON_2X5

SEE NOTES

X_R

SXR

GND

VDD

123

JP4

CON_SIP3

GND

VDD

1234567

8

JP7

CON_SIP8

SYB

1

SXR

2

XPWRS

3

RSVD1

4

VRE

F

5

RESET

6

VSS

2

7

VDD

8

OSCIN

9

OSCOUT

10

VSS11XR112YB1

13

YT114XL1

15

HCLK

16

XCL

K

1

7

XDA

T

1

8

HDA

T

1

9

XL2

2

0

YT2

2

1

YB2

2

XR2

2

3

L

B

2

4

RB

25

RSVD2

26

RSVD3

27

RSVD4

28

RSVD5

29

PWR_DOWN

30

SXL

31

SYT

32

U1

UR7HCTS2_P840

32-pin LQFP

Y1

4.00MHz

M_CLOCK

GND

Mounting

holes

GND

C8

47pF

PS/2 DATA

SHIELD

GND

+5V

PS/2CLOCK

1

2

3

4

5

JP2

S5B_PH_K

M_DATA

M_CLOCK

VDD

GND

C1

.1uF

C2

10uF

VDD

GND

GND GND

1

2

3

U2

TC54VC4502ECB

C3-C6 10nF +/-10% CERAMIC X7R

C1 .1uF ANY CERAMIC ANY

REF VALUE TOLERANCE OTHER DATA

NOT_RESET

GND

FXL

FYT

C3

10nFC410nF

1357

8642

RN1

10k

FYB

FXR

NOTES:

GND

C5

10nFC610nF

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.

P840 == PS/2 In/Out, 8/4-wire, 4.00 MHz, Model 0.

Traces of the jumpers are located on the Bottom (Solder) side of the PCB,

between the pins of JP1.

GND

RN1 10K +/-5% ANY

Y1 4.00 MHz PBRC-4.00BR/AVX

REF VALUE PART NUMBER/MFG

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13

MECHANICAL INFORMATION FOR THE FG PACKAGE

e

F

y

b

HD

D

32 25

1

24

E

H

8

L1

c

A1 A2

L

9

Symbol

A

A1

2

A

16

Dimension in Millimeters

Min Nom Max

–

0

––

0.1

1.4

b

M M

c D E e

D

H

E

H

–

0.8

L

1

L

y

b

2

I

2

D E

–– –

1.0

0.5

7.4

Detail F

A

M

D

e

ME

b2

I2

17

–

1.7

0.2

0.450.350.3

0.1750.1250.105

7.17.06.9

7.17.06.9 –

9.29.08.8

0.70.50.3

– –

0.1

10ϒ0ϒ

–– –– –– ––

Recommended PCB Footprint

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14

ELECTRICAL SPECIFICATIONS

Absolute Maximum Ratings Ratings Symbol Value Unit

Supply Voltage Vdd -0.3 to 7.0 V Input Voltage Vin Vss -0.3 to Vdd +0.3 V Current Drain per Pin I 20 mA (not including Vss or Vdd) Operating Temperature Ta T low to T high ° C UR7HCTS2-P840 -20 to +85 ° C Storage Temperature Range Tstg -40 to +125 ° C

DC Electrical Characteristics, Temperature range=T low to T high unless otherwise noted) Characteristic Symbol Min Typ Max Unit

Supply Voltage 3.0 5.0 5.5 V Output Voltage (10 µA load) Voh Vdd–0.1 V

Vol 0.1 Input High Voltage Vih 0.8 x Vdd Vdd V Input Low Voltage Vil Vss 0.2xVdd V Input Current Iin +/- 10 µA Supply Current (Vdd=5.0 Vdc+/-10%, Vss=0) Idd 3.0 TBD 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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15

SCREENCODERTMPS2 BILL OF MATERIALS FOR PAGE 10 SCHEMATIC

UR7HCTS2-P840-FG BOM Description Quantity Manufacturer Part# Description Capacitors:

C1 1 Generic Any .1uF, 10%, Ceramic, X7R or Z5U C2 1 Generic Any 10uF, 10V, +80%/-20%, Tantalum C3, C4, C5, C6 4 Generic Any 10nF, 10%, Ceramic, X7R C7, C8 2 Generic Any 47pF, 10%, Ceramic, X7R

ICs:

U1 1 Semtech UR7HCTS2-P840-FG ScreenCoderTMPS/2 Controller U2 1 Telcom TC54VC4502ECB Reset IC

Resistor Network

RN1 1 Generic Any 10K, 4 independent resistors

Resonator:

Y1 1 AVX PBRC-4.00BR 4.00MHz Ceramic Resonator w/ Caps, SMT

Inductor

L1 1 Generic Any 12uH Inductor

NNoottee::

Auxillary components are not shown.

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Copyright ©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.

Datasheet UR7HCTS2-P840-FG Datasheet (Semtech)

Specifications and Main Features

Frequently Asked Questions

User Manual