Gunze Electronics USA Corporation
A Guide
to
An Analog Touch Panel Controller Chip
Through Serial(CRS1-656),PS/2(CRS1-685)
First Print: JUN. 21, 1999
Rev4
AUG.15, 2000
Gunze Electronics USA Corporation
2113 Wells Branch Parkway
Austin, TX. 78728-6970
Telephone: (512) 252-1299
Fax:
(512) 251-5687
This Guide contains the company’s copyright and knowledge. You are advised not to use this
Guide for applications other than this product intent. Copies and disclosures to third parties of
this guide are strictly forbidden without written consent of Gunze Electronics USA Corporation.
Some alteration of the guide due to improvements of products may be made without prior notice.
For questions regarding this product, please contact Gunze Electronics USA co..
SPEC 8.2.00
1
Table of Contents
1. General
2. Features
(1) Power Supply
(2) External Conditions Frequency
(3) Electric Resolution
(4) Communication
(5) Output Rate
(6) Output Mode
(7) Adaptable Touch Panel
3. Pin Configuration
(1) Terminal Arrangement Diagram
(2) Function of Terminals
4. Connection for 12bit A/D Converter
5. Absolute Maximum Rating
6. External Circuits
7. Settings
8. Continuous Mode
9. Serial Communication (CRS1-656)
(1) Communication Setting
(2) Data Format
(3) Response Speed
(4) List of Commands
10. PS/2 Communication (CRS1-685)
(1) Communication Setting
(2) Data Format
11. Other Functions
(1) Calibration
(2) Stop Mode
(3) Mouse Emulation
12. Warranty
(1) Warranty Period
(2) Warranty Clause
Appendixes
* Sample Schematic for serial communication (CRS1-656)
* Sample Schematic for PS/2 communication (CRS1-685)
* Package Outline
* Storage and Soldering
SPEC 8.2.00
2
1. General
The CRS1 is an interface controller chip which senses pressed positions of a transparent
analog resistive touch panel and can eliminate unstable data (voltage value) generated by
softly pressing it or some external noises coming into the circuitry. By the internal filtering
process, all of the pressed positions can be sensed with a high degree of accuracy and these
data are sent to your host system with serial communication (CRS1-656) or PS/2
communication (CRS1-685).
2. Features
(1) Power Supply
2.7 to 5.5 Volts
3.3 to 5.5 Volts (when using a 12bit external A/D converter)
(2) External Clock Frequency
4 MHz
(3) Electric Resolution
10 bit (1024 x 1024) or 12 bit (4096 x 4096 : with an external ADC)
Note: These values are electrical resolutions for the controller. The physical resolution
of the touch panel key area is lower than that value and varies depending on
each touch panel.
(4) Communication
Serial Communication (CRS1-656) or PS/2 Communication (CRS1-685)
(5) Output Rate
5-1 Serial Communication (CRS1-656)
A. AHL Mode (Gunze original Mode)
87cps (Coordinate Per Second).
B. ELO Emulation Mode Limited command supported. (more likely to work with
80cps
Monitor Mouse for Windows supplied by ELO Touch Systems
through COM port.)
Under the condition of Baud Rate=9600bps,Parity=No,Data Length=8, and Stop Bit=1
5-2 PS/2 Communication (CRS1-685)
about 100PPS (PPS: point per second)
(6) Output Mode
Continuously (When pressing the touch Panel, continuous data is being received.)
(7) Adaptable Touch panel
4 & 8 - wire resistive analog touch panel made by Gunze. 8 - wire is highly recommended.
The CRS1 controller is recommended only for Gunze’s touch panels.
SPEC 8.2.00
3
3. Pin Configuration
(1) Terminal Arrangement Diagram
(2) Function of Terminals
TERMINAL
IN/OUT
NAME
V CC
FUNCTION
POWER SUPPLY
PIN
FUNCTION
8
SET FOR COM / PS2
TERMINAL
NAME
SET 0
VSS
11
SET FOR COM. SPEED
IN/OUT
PIN
IN
12
SET 1
IN
13
GND
REF. VOLTAGE FOR A/D
CONVERTER
R4.7k PULL DOWN
V REF
5
SET FOR RESOLUTION
SET 2
IN
14
CNVSS
7
SET 3
IN
15
TOUCH PANEL CONTROL
SEL1
OUT
21
SET FOR GUNZE / ELO
SET FOR COMMUNICATION
FORMAT / STOP MODE
SET 4
IN
16
TOUCH PANEL CONTROL
SEL2
OUT
22
SERIAL DATA RECEIVE 4
RxD
IN
26
SERIAL DATA TRANSMISION
TOUCH PANEL CONTROL
SEL3
OUT
23
TOUCH PANEL CONTROL
SEL4
OUT
24
TOUCH PANEL CONTROL
TxD
OUT
27
PS2DATAIN
IN
3
PS2 CLOCK IN
PS2CLKIN
IN
4
3
PS2 DATA IN
3
SEL5
OUT
25
1
ANALOG INPUT
ANIN1
IN
31
PS2 DATA OUT
PS2DATAOUT
OUT
19
ANALOG INPUT1
ANIN2
IN
32
PS2 CLOCK OUT
PS2CLKOUT
OUT
18
ANALOG INPUT1
ANIN3
IN
1
RESET
~RESET
IN
6
1
ANIN4
IN
2
STOP MODE RELEASING
SBCAN
IN
17
~ADCS
OUT
20
CLOCK IN
XIN
9
CLOCK OUT
IOUT
10
ANALOG INPUT
EXTERNAL A/D CONTROL2
2
EXTERNAL A/D CONTROL
ADCLK
OUT
28
EXTERNAL A/D CONTROL2
ADDATA
IN
29
EXTERNAL A/D CONTROL2
ADCTRL
OUT
30
Footnote 1 : VSS for 12bit resolution with external A/D converter.
Footnote 2: open for 10 bit resolution.
Footnote 3: open for the CRS1-656 in serial communication.
Footnote 4: Vss for the CRS1-685 in PS/2 communication.
SPEC 8.2.00
4
4. Connection for 12 bit A/D Converter
In the case of 12 bit resolution, need to wire lines with a A/D converter
(Burr-Brown ADS7841) below.
A/D CONVERTER
CRS1
DCLK
16
28 ADCLK
~CS
15
20 ~ADCS
DIN
14
30 ADCTRL
12
29
DOUT
ADDATA
* When using the external A/D converter, ANIN 1,2,3,4 should be connected to Vss.
5. Absolute Maximum Rating
ITEM
SYMBOL
POWER VOLTAGE
CONDITION
RATING
UNIT
VCC
- 0.3 ~ 7.0
V
INPUT VOLTAGE
VIN
VSS - 0.3 ~ VCC + 0.3
V
OUTPUT VOLTAGE
VOUT
VSS - 0.3 ~ VCC + 0.3
V
POWER CONSUMPTION
PD
300
mW
POWER CURRENT
I CC
3.5 - 6.5
150
mA
OPERATING TEMPERATURE
TOPR
- 20o ~ 85o
o
STORAGE TEMPERATURE
TSTG
- 40o ~ 125o
o
Ta = 25 C
4Mhz - 5v
STOP MODE
µA
C
C
6. External Circuits
i) Resonator
ii) External Clock
Fig-2 Clock Generating Circuit
Fig-1 Reset Circuit
7. Settings
SET 0
Mode
OPEN
Serial (CRS1-656)
SHORT
PS/2 (CRS1-685)
SET 1 (only for CRS1-656) OPEN
9600bps
Speed
* ELO Driver requires 9600bps
SHORT
19200bps
SET 2
Resolution
SHORT
12bit
OPEN
10bit
SPEC 8.2.00
5
SET 3 (only for CRS1-656) OPEN
Gunze
Emulation Mode
SHORT
ELO Emulation
SET 4 (only for CRS1-656) OPEN
Gunze Mode
Stop Prohibited
ELO Emulation Mode
Binary
SHORT
Stop Permitted
ASCII
* ELO Driver Requires Binary
8. Continuous Mode
When pressing the touch panel, the controller generates X-Y coordinates of the pressed
position. If you maintain a continuous press, the controller keeps generating a string of data
continuously. When releasing the press, a single data is generated. See below.
Touching the panel
Generating the data
Touch Data
Release Data
9. Serial Communication (CRS1-656)
(1) Communication Setting
! Baud Rate: 9600, 19200 bps (ELO Mode: 9600 bps)
! Data Bits : 8 bit
: unidentified
! Parity
! Stop Bit : 1 bit
(2) Data Format
A. AHL Mode (Gunze original Mode)
Header
("T" or "R")
X Data
(4 bytes)
Comma
Y Data
CR
","
(4 bytes)
(0D H )
11 bytes/data are sent by 8 bits ASCII Format.
* An example in Continuous Mode
T0273, 0581
Press
T0273,0582
T0272,0581
*
*
Continuing to press
*
T0273,0582
R0273,0581
Release
!
!
!
T as a header for pressing the touch panel, and R as a header for releasing it
Position values of both X and Y are from 0 to 1023 in decimal
The origin of X and Y axes is at the bottom left corner with proper line connections.
Note: By our experiment, the active position value is approximately from 20 to 1000 in usual.
SPEC 8.2.00
6
B. ELO Emulation Mode
! Binary Format
Byte
1
Lead-In-Byte (55h)
2
Touch Data Flag (54h)
3
Touch Status
4
X Lower Data (8 bit)
5
X Upper Data (4 bit)
6
Y Lower Data (8 bit)
7
Y Upper Data (4 bit)
8
Z Lower Data (FFh)
9
Z Upper Data (0h)
10
SumCheck
*Touch Status:FirstTouch 01h
MiddleTouch 02h
Release
04h
*SumCheck means all additions from
Byte 1 to Byte 9 and AAh.
*Z data is unavailable and fixed 255.
!
ASCII Format
18 bytes/data are sent by 8 bits ASCII Format.
X Data
(4 bytes)
Space
Y Data
(4 bytes)
Z Data
(4 bytes)
Space
Space T / U
CR
(0D H )
(3) Response Speed
Touch Panel
Output
about 17 mS
about 12 mS
Note:
Data shown are based on the following settings:
Baud Rate ------------- 9600bps
Parity ------------------ Unidentified
Data Bits -------------- 8 Bit
Stop Bit --------------- 1 Bit
SPEC 8.2.00
7
(4) List of Commands
A. AHL Mode (Gunze original Mode)
Command
RE
Actuation
Reset
Note: If the controller receives the command while sending data, the data may be affected.
DI
Diagnose the controller board. If normal, it returns Pass $$$$.
* $ stands for space.
SR
Stop sending transmission. Commands can be received while running.
* While in data transmission, the transmission stops from the next data.
BR
Resume sending transmission
CTRL-S
(Same as "SR")
CTRL-Q
(Same as "SR")
VE
Return software version "V1.0$$"
* $ stands for space.
LF
Make data delimiter CR (0D H) and LF (0A H)
CR
Make data delimiter CR (0D H)
XL
Return X-Low reference data (calibration data) <e g.> "0012"
*Reference Data are the data of an electrode voltage of the touch panel. The X-Low
Reference Data are the data expressing an electrode voltage of the lower potential when
the panel in X direction is electrically impressed.
XH
Return X-High reference data (calibration data) <e g.> "1002"
YL
Return Y-Low reference data (calibration data)
YH
Return Y-High reference data (calibration data)
SPEC 8.2.00
8
Note: i. Send command by ASCII Format.
ii. When sending command, add CR (0DH) at the end.
iii. Either capital letters or small letters are good.
Command is executed immediately upon receiving it. Even if CRS1 is transmitting
data, commands are received, and commands commanding response (e g. "DI", "VE" &.c)
produce responding data followed by transmission of interrupted position data.
<Example> "DI" Command case
:
:
T0381, 0892
T0381, 0892
T0380, 0892
Pass
T0380, 0892
T0381, 0892
:
v.
Responding data to the command are usually attached by CR (0DH) at the end
vi. If a command is not duly received or if the command is not contained in the commands
list, such the command is ignored (without output).
vii. Take longer time than 15 mS between a command and the following command.
B. ELO Emulation Mode
Binary Mode
i. Acknowledge ( a )
ii. Diagnostic ( d )
iii. ID ( i )
iv. Owner ( o )
v. Quiet ( q )
vi. Select Stop Mode ( z ) *Gunze original command
SPEC 8.2.00
9
10. PS/2 Communication (CRS1-685)
Communication is established by the clock line and the data line in synchronous
with clock signal.
Recommendation driver software is T5SETUP.EXE under Windows95.
Caution :Some computers can not be used through PS/2 port with the CRS1 controller,
because its function is hardware oriented.
In the case of note book type computer, you should set up its internal pointing device
prohibited because of conflict with the CRS1 and that device.
(1) Communication Setting
! Data length
:8bit
! Parity
:Odd
! Stop bit
: 1bit
(2) Data Format
1st byte
2nd
byte
3rd byte
M SB
1
1
0
X9
X2
T/R
X8
X1
Y5
X7
Y0
Y4
X6
Y9
Y3
X5
Y8
Y2
[T/R] 1: Touching 0: Releasing
[X9-X0]X position data X9: MSB X0: LSB
[Y9-Y0]Y position data Y9: MSB Y0: LSB
*X and Y data consist of 10bit.
*The range of X and Y data are from 0h to 3FFh( 00 0000 0000
SPEC 8.2.00
X4
Y7
Y1
•
LSB
X3
Y6
Y0
---11 1111 1111
•
).
10
11. Other Functions
(1) Calibration
I. Auto-Calibration
Vref 1
Wiring Section
Key Area
Vref 2
Wiring Section
Illustration : Equivalent Circuit of Touch Panel
Generally, touch panels have an equivalent circuit as the illustration above shows.
When a DC voltage is applied to both terminal ends of the touch panel, the total voltage
drop across the circuit is equal to the sum of the voltage drops of a key area and both wiring
sections. Each voltage drop will vary when any resistance varies. It means that a position
shift on the monitor will occur even on the same point to be pressed if any resistance changes.
On the contrary, the combination of the controller and a 8-wire touch panel has an
auto-calibration function which eliminates the resistance of both wiring sections by reading
reference voltage, such as Vref 1, Vref 2. Those reference data are detected when powering on,
sending reset command(only in serial communication), or returning from Stop Mode, and
stored in the controller memory during powering on. After those processes, the controller
generates data which are adjusted from 0 to 1023 over the key area. Therefore, you can get
very stable data in various environmental conditions for a long period of time in use.
Difference between 4-wire touch panel and 8-wire touch panel
[ 4 wires Touch Panel ]
xL
xR
yU
yL
The controller outputs the digital position data converted from the analog voltage of the
pressed position. For example, when the analog voltage of the pressed point is 2(V) for
applying 5(V) to the terminals, “409” is the outputted data. 2(V) / 5(V) x 1023 = 409
SPEC 8.2.00
11
[ 8 wires Touch Panel ]
x L ref
xL
xR
x R ref
yU
y U ref
y L ref
yL
The controller reads reference voltages (xRref, xLref, yUref, yLref) and outputs a
compensated pressed position data calculated on the basis with xRref=0, xLref=1023,
yUref=0, yLref=1023. For example, when the analog voltage of the pressed point is 2(V)
for applying 5(V) to the terminals and xRref=20, xLref=1000, “406” is the outputted data.
2(V) / 5(V) x 1023 = 409 , (409-20) x (1023 / (1000-20)) = 406
II. User-Calibration
We strongly recommend you to match the pressed position data with the displayed position
data by calculating relative positions on your system, so-called User-Calibration. You need to
make it at least for the initial use or the time of recognizing an offset between a pressed position
and a displayed one for any touch panels, even though they are totally in the same design.
An example of User Calibration is shown below;
Point-B !
! Point-A
*Position data of point-A : (Xa,Ya)
*Position data of point-B : (Xb,Yb)
Presumption : Xa<Xb and Ya<Yb
*Displayed position of point-A : (DXa,DYa)
*Displayed position of point-B : (DXb,DYb)
Presumption : DXa<DXb and DYa<DYb
The constant value in direct proportion of the resolution between the touch panel and the
display monitor in the X direction is;
CX=(DXb-DXa)/(Xb-Xa) ---------------------- A)
in the Y direction is;
CY=(DYb-DYa)/(Yb-Ya) ---------------------- B)
SPEC 8.2.00
12
Consequently, the relationship between an arbitrary position on the touch panel(Xn,Yn) and
an displayed position on the monitor(DXn,DYn) is;
DXn=DXa+CX*(Xn-Xa) ------------------------- C)
DYn=DYa+CY*(Yn-Ya) ------------------------- D)
With the execution of Use Calibration, first of all, get the data Xa,Ya,Xb,Yb by pressing
two points of the touch panel on the display monitor, and store them in the host system. Second
of all, obtain the constant values of CX and CY from Eq.(A) and (B), and store them in the host
systemwith DXa and DYa.
After all of those processes, you can obtain accurate pressed positions on the display monitor
(DXn,DYn) by getting the pressed data(Xn,Yn) and utilizing Eq.(C) and (D) while in ordinary
operation. User Calibration should be done whenever you press the touch panel.
(2) Stop Mode
Stop Mode is a low power consumption mode that the touch panel controller is providing.
In the case of setting Stop Mode on, it becomes in low power consumption state when not
pressing the touch panel or not sending any commands to it for more than 30 seconds. During
the state, no serial command is accepted. Sending Reset command or feeding a signal to
SBSCAN terminal of the controller in low power consumption state make the controller resume.
In the case of setting Stop Mode off, reading the reference voltages of Auto Calibration is made
only when powering on or sending Reset command.
(3) Mouse Emulation
Gunze Electronics USA co. provides several device drivers for mouse emulation with
PC/AT of IBM or IBM compatible computers and our controllers. Those drivers enable
you to utilize the touch panel like a mouse on your system.
We are providing device drivers as follows;
Serial Communication (CRS1-656)
TT-DOS
under MS-DOS
TT-OS/2
under OS/2
TT-WIN
under Windows3.1
TT-WIN95 under Windows95/98
TT-WIN
under WindowsNT
PS/2 Communication (CRS1-685)
TT-WIN95PS/2 under Windows95/98
SPEC 8.2.00
13
12. Warranty
(1) Warranty Period
One year after delivery
(2) Warranty Clause
Within the warranty period, in such a case of malfunction or breakdown caused by
Gunze‘s failure, the product is exchanged or repaired.
The following cases are exceptions to the warranty coverage.
(i) After the product is delivered, such damage or breakdown from failing
or collision which is caused by user‘s mishandling.
(ii) Such damage or breakdown caused by natural or manmade disaster.
(iii)Such damage or breakdown caused by alternation or repair of product
which is made by the party other than Gunze.
(iv)Such damage or breakdown caused by use or handling of the product
in such a manner as against the instructions of this guide.
Note: The warranty is limited to only the product itself and does not cover any subsequent
damage, breakdown or loss which might be caused by malfunction of the product.
We can not repair or exchange of the product on the site it is installed.
SPEC 8.2.00
14
Appendixes
*Sample Schematic for Serial Communication (CRS1-656)
SPEC 8.2.00
15
Appendixes
*Sample Schematic for PS/2 Communication (CRS1-685)
SPEC 8.2.00
16
Appendixes
*Package Outline
SPEC 8.2.00
17
Appendixes
*Storage and Soldering
SMT(Surface Mount Type) ICs are sensitive for thermal stress with package absorbing
moisture. So you should keep them not to absorb ambient moisture before soldering.
MP(Moisture Proof) bags prevent ICs from absorbing moisture during transportation
and storage at warehouses or factories.
1. Storage
a) The unopened MP bag kept at 5 to 40’C / 20 to 80%RH could prevent moisture within two
years.
b) After opening MP bags, you should store ICs at 30’C / 70%RH or under and solder them
within four days.
c) When you must open MP bags temporarily, opening time should be within ten minutes.
And then, you should fold the opening side of bags into two and close them with adhesive
tape.
d) Over the time period above, you are recommended to bake ICs at 125’C in 20 to 24 hours
before using. (Four times maximum, less than 96 hours totally)
2. Recommended temperature profile of soldering
(1) Reflow soldering method
As for Infrared Reflow and Air Reflow, see Fig-1, and as for VPS Reflow, see Fig-2.
Those temperature profiles show the temperature on the IC surface.
You can apply a maximum of four times.
SPEC 8.2.00
18
(2) Wave soldering method
See Fig-3. The preheat temperature is depending on the type of flux.
The temperature profile shows the temperature on the IC surface.
You can apply just a time.
3. Cleaning
If you need to clean the boards with solvents after soldering, you should pay attention to
administrative guidance and regulation, residual ionic(non ionic) contamination, and solvent
resistance of parts.
SPEC 8.2.00
19