DMC TSC-25/RSA Series User manual

Analog Resistive Touch Screen Controller
TSC-25/RSA Series User’s Guide

1 Rev.1.3 ©2005-2006 DMC Co., Ltd.
TSC-25/RSA Series User’s Guide
Table of Contents
1. Product Overview....................................................................................................................2
1-1. Products Applicable ...........................................................................................................................2
1-2. Product Names ..................................................................................................................................2
1-3. Overview............................................................................................................................................2
2. Specifications..........................................................................................................................3
3. Connector.................................................................................................................................4
3-1. Explanation of a connector terminal...................................................................................................4
3-2. The mounted connector .....................................................................................................................4
4. Operation modes and functions............................................................................................ 5
4-1. Outline................................................................................................................................................5
4-2. Initialization mode and idle mode.......................................................................................................7
4-3. Coordinate data mode........................................................................................................................9
4-4. Calibration data setup mode ............................................................................................................12
4-5. Calibration data read mode..............................................................................................................16
4-6. Calibration data mode......................................................................................................................17
4-7. STOP mode .....................................................................................................................................20
4-8. Panel ID/mode information acquisition.............................................................................................21
4-9. Mode list...........................................................................................................................................22
4-10. Command list.................................................................................................................................22
5. Changes & Improvements....................................................................................................23
5-1. Version History.................................................................................................................................23
6. Warranty.................................................................................................................................24
6-1. Warranty Period ...............................................................................................................................24
6-2. Warranty Target ...............................................................................................................................24
6-3. Warranty Exceptions........................................................................................................................24
7. Precautions for Use ..............................................................................................................25
7-1. General Handling.............................................................................................................................25
7-2. Others ..............................................................................................................................................25
Dimensional Drawing

2 Rev.1.3 ©2005-2006 DMC Co., Ltd.
TSC-25/RSA Series User’s Guide
1. Product Overview
1-1. Products Applicable
This specification is applicable to TSC-25/RSA and TSC-25/RSA-E.
1-2. Product Names
Product Name Description
TSC-25/RSA TSC-20/IC installed touch screen controller board.
TSC-25/RSA-E TSC-20/IC installed touch screen controller board with EEPROM.
1-3. Overview
TSC-25/RSA and TSC-25/RSA-E are a touch screen controller board that performs an A/D conversion of
an analog signal of a 5 wire resistive touch screen, and transmits the coordinate data to the host in a 10-bit
resolution serial correspondence at 9600bps. TSC-25/RSA and TSC-25/RSA-E can be used for various
applications for its functions including the power saving mode, seven sampling speed settings (max.
150p/s *1), two external switch connections, and automatic calibration data loading with an external
EEPROM.
§ TSC-25/RSA TSC-25/RSA dispenses a need to newly design the peripheral circuits, and can easily
be used by connecting to the touch screen and the host. Using the driver software *2
enables the mouse emulation on various operation systems and dispenses the need
to newly design the controller software.
§ TSC-25/RSA-E An EEPROM installed version of TSC-25/RSA. The calibration data can be stored in
the EEPROM and automatically read after power-on.
*1: 150 transmissions of coordinate data per second.
*2: Please contact the local sales representatives for software availability.

3 Rev.1.3 ©2005-2006 DMC Co., Ltd.
TSC-25/RSA Series User’s Guide
2. Specifications
General Specifications
Item Rating Remarks
TSC-25/RSA
Operating Temp. TSC-25/RSA-E -20°C to +75°C
(No dew condensation)
TSC-25/RSA
Storing Temp. TSC-25/RSA-E -20°C to +85°C
(No dew condensation)
TSC-25/RSA
Supply Voltage TSC-25/RSA-E DC 4.1V to 5.5V
TSC-25/RSA
Supply Current TSC-25/RSA-E 40mA Vin=5.0V, At sampling Rate = 50p/s
when touch screen is activated
Format Asynchronous Serial
Transfer Rate 9600bps
Data Format 8bit
Stop Bit 1bit
Correspondence
Parity None
Fixed value
Frequency 6MHz 6MHz fixed
TSC-25/RSA
Dimension TSC-25/RSA-E 30 x 40 mm
5.5mm
Max height of components (2mm) When EEPROM mounted.
The backside of a board.
Performance Specifications
Description Rating Note
Coordinate Output Rate (point/sec)
(1) point mode
(2) 30p/s (3) 50p/s
(4) 80p/s (5) 100p/s
(6) 130p/s (7) 150p/s
Default: 50pps with DMC original
driver software.
Coordinate Resolution 10bit (1024 x 1024) The value will be lower in the active
area of the touch screen
Linearity Error ±3 LSB
Input Response Time 23ms Maximum value at 50pps.
When using the coordinate data mode

4 Rev.1.3 ©2005-2006 DMC Co., Ltd.
TSC-25/RSA Series User’s Guide
3. Connector
3-1. Explanation of a connector terminal
CN Terminal Name Function
1 XL/UR Touch screen Input XL/UR (Open if CN2 is used)
2 XR/LR Touch screen Input XR/LR (Open if CN2 is used)
3 Sense Coordinates detection (Open if CN2 is used)
4 YU/UL Touch screen Input YU/UL (Open if CN2 is used)
CN1
5 YD/LL Touch screen Input YD/LL (Open if CN2 is used)
1 YD/LL Touch screen Input YD/LL (Open if CN1 is used)
2 YU/UL Touch screen Input YU/UL (Open if CN1 is used)
3 Sense Coordinates detection (Open if CN2 is used)
4 XR/LR Touch screen Input XR/LR (Open if CN1 is used)
CN2
5 XL/UR Touch screen Input XL/UR (Open if CN1 is used)
1 Dout RS-232C Data Output
2 Din RS-232C Data Input
CN3
3 GND RS-232C GND
1 Dout RS-232C Data Output
2 Din RS-232C Data Input
CN4
3 GND RS-232C GND
1 Vin Power Input
CN5 2 GND GND
Either CN1 or CN2 is mounted.
Either CN3 or CN4 is mounted.
3-2. The mounted connector
CN P/N Manufacturer
CN1 RE-H052SD-1110 J.S.T. Mfg Co., Ltd
CN3 S3B-PH-K-S J.S.T. Mfg Co., Ltd
CN5 S2B-PH-K-S J.S.T. Mfg Co., Ltd

5 Rev.1.3 ©2005-2006 DMC Co., Ltd.
TSC-25/RSA Series User’s Guide
4. Operation modes and functions
4-1. Outline
TSC-20/IC enters the Initialization mode immediately after it is turned on or reset. In this mode, no setting
is made and each mode shall be set. To transition to the available state, select the coordinate output rate
and coordinate output mode and set the operation mode.
§ Initialization mode
By either power supply ON or hardware reset/software reset, the internal initial setting is performed. In
the serial scheme, communication with host is available. In USB scheme, device recognition process
ends. In this mode, both serial and USB schemes receive a coordinate output rate command and tran-
sition to the idle mode.
After hardware reset, it takes 500ms to transition to the initialization mode.
In using the EEPROM, EEPROM data is read in this mode.
§ Idle mode
TSC-20/IC enters this operation waiting mode after the coordinate output rate setting command is re-
ceived. Transition to each mode takes place in this mode.
§ Coordinate data mode
In this mode, analog data obtained from touch screen is output as coordinate data with 10 bit resolution
without any calibration.
This mode starts in the “idle mode“ by receiving the coordinate data send start command, and returns
to “idle mode” again after receiving the coordinate data send end command. By receiving reset com-
mand, it transitions to the ”initialization mode“.
This mode is used when host driver implements the calibration function, and also when necessary data
is obtained in the calibration data setup mode.
§ Calibration data setup mode
In this mode, calibration data used in “calibration data mode“ is set. Transition to this mode takes place
when the setup mode start command is received in the idle mode. Select an appropriate calibration
point among:
- X=2, Y=2 (four point calibration)
- X=3, Y=3 (nine point calibration) and
- X=2, Y=2 (four point calibration) plus one center position (five point calibration)
When this mode ends, calibration data is entered to EEPROM.
§ Calibration data read mode
In this mode, setup data is read out from EEPROM if in using EEPROM, data set in the ”calibration
data setup mode“ is stored to EEPROM. It is used if setting data is to be confirmed. Transition to this
mode takes place and calibration data is output to the host if in the idle mode, calibration data read
command is received.
§ Calibration data mode
In this mode, individual difference and loss in the touch screen are corrected and coordinate value out-
put is performed. Using calibration data set in the ”calibration data setup mode“, touch screen input
point and indicator’s cursor display position can be matched.
In using this mode, the host driver needs no calibration function.
Using “calibration data setup mode“ setting value to set the coordinate data maximum value, maximum
value can be limited to 10bits or less.
This mode starts when in the idle mode, any ”calibration data send start command“ is received, and
returns to the idle mode when receiving the calibration data send end command. When receiving the
reset command, this mode transitions to the initialization mode.

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TSC-25/RSA Series User’s Guide
§ STOP mode
This mode is enabled only in the serial communication. This mode starts when in the idle mode, STOP
mode start command is received. This mode stops ceramic vibrator’s vibration and enters the power
saving mode where the operation stops. By hardware reset, this mode transitions to the initialization
mode. By receiving [00h] (null command) from host, the power saving mode ends and transitions to the
idle mode.
§ Power-save mode
This mode is only enabled in the serial communication. If in the coordinate data mode transitioned from
[01h] or the calibration data mode transitioned from [0Ah], there are no inputs on the touch screen for
20 samplings, the ceramic vibrator stops its vibration and enters the power saving mode where no op-
erations are taken. By inputting the touch screen or receiving a command from host, power saving
mode is released and the transition to “coordinate data mode “ or ”calibration data mode“ takes place.

7 Rev.1.3 ©2005-2006 DMC Co., Ltd.
TSC-25/RSA Series User’s Guide
4-2. Initialization mode and idle mode
After the power up or hardware reset, internal initialization setting is performed (about 500ms) and the
transition to the initialization mode occurs, where waiting for the communication with host. In this mode, if
external EEPROM is used, EEPROM data is read.
In the initialization mode, use the coordinate output rate setting command to set the interval for sending a
coordinate. Where, touch screen connection state and EEPROM data are checked and in either normal or
abnormal case, data representing each state is output to the host. Thus, the initialization mode transitions
to the idle mode. Transition to each mode occurs from the idle mode. Once coordinate output rate is set
with transition to the idle mode, coordinate output rate setting may be available again.
If in either idle mode, coordinate data mode or calibration data mode, reset command is received, transi-
tion to the initialization mode occurs. Where, after receiving the reset command, internal processing takes
a time, be sure to issue subsequent commands after 6ms or more is elapsed.
§ Mode transition
*After application of power (hardware-reset), to tell a host computer having changed into the
state where TSC-20/IC can communicate, it outputs “12h”. But, “12h” is not outputted when
software-reset is carried out.
§ Coordinate output rate setting command (S_Rate)
Mode Sampling Command Description
30p/s 05h+40h
50p/s 05h+41h
80p/s 05h+42h
100p/s 05h+43h
130p/s 05h+44h
Stream
150p/s 05h+45h
Point Once when
touched 05h+50h In the coordinate (calibration) data mode, no pen-up data
is output.
Host
TSC-20/IC
Initialization
(About 500ms)
Idle mode
Initialization mode
Internal initial setting
[S_Rate] [06h/15h]
[12h]
Power-on

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TSC-25/RSA Series User’s Guide
§ Response command (no EEPROM is used)
State Response command Byte
width Description of mode
Normal 06h (ACK) 1 byte Touch screen connection normal
Abnormal 15h (NAK) 1 byte Touch screen not connected
§ Response command (EEPROM is used)
State Response command Byte
width Description of mode
Normal 06h (ACK) 1 byte Touch screen connection, EEPROM data
normal
15h (NAK) + detail code
bit0=1 (01h) EEPROM data empty
bit1=1 (02h) EEPROM data abnormal
bit2=1 (04h) EEPROM write error
Abnormal
bit3=1 (08h)
2 bytes
Touch screen not connected
* If, in the initialization mode, coordinate output rate setting is performed, EEPROM is checked if data is
present or not. Thus, error code only refers to EEPROM data empty (detail code: 01h).
In the idle mode, run the calibration data setup mode. After EEPROM data abnormal or EEPROM write
error occurs, set the coordinate output rate, error code is output, indicating EEPROM data abnormal or
EEPROM write error. Error flag can be deleted by either hardware reset or software reset.

9 Rev.1.3 ©2005-2006 DMC Co., Ltd.
TSC-25/RSA Series User’s Guide
4-3. Coordinate data mode
Analog data input from analog touch screen is A/D converted for calculating the coordinate data, which is
output in this mode.
This mode is used if calibration is made in the host driver. In using the external EEPROM in the calibration
data mode, previously performed ”calibration data setup mode“ needs raw data, which is obtained in this
mode.
From the idle mode, this mode starts by receiving either command of coordinate data send start 1 – 3, and
returns to the idle mode by receiving the coordinate data send end command. By receiving “reset” com-
mand, the mode transition to the initialization mode.
At the touch screen input (when a finger or pen touches on the touch screen), coordinate data, including
pen-down ID indicating that touch screen is input, is output to the host with coordinate output rate interval.
If the touch screen input ends (when a finger or pen leaves the touch screen), pen-up ID of 1byte is output
(excluding the point mode).
§ Mode transition
§ Command and each mode function
Mode name Command Function
Coordinate data send
start 1 01h
Pen-down: Coordinate data including pen-down ID is output with the
coordinate output rate interval.
Pen-up: Pen-up ID is output one time.
No input: If there are no inputs for 20 sampling times, transition to the
power-save mode occurs.
Coordinate data send
start 2 21h
Pen-down: Coordinate data including pen-down ID is output with the
coordinate output rate interval.
Pen-up: Coordinate data including pen-up ID is output with the co-
ordinate output rate interval.
No input: No transition to the power-save mode.
Coordinate data send
start 3 31h
Pen-down: Coordinate data including pen-down ID is output with the
coordinate output rate interval.
Pen-up: Pen-up ID is output one time.
No input: No transition to the power-save mode.
Coordinate data send
end 02h Coordinate data mode ends and transition to the idle mode occurs.
[02h]
Host
TSC-20/IC
Coordinate data mode
Idle mode
[01h/21h/31h] Coordinate
data
[06h]