CRS1 ETC-unknow, CRS1 Datasheet - Page 12

• Manufacturer Part Number: CRS1
• Description: An Analog Touch Panel Controller Chip Through Serial Crs1-656 ,ps/2 Crs1-685
• Manufacturer: ETC-unknow

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.
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;
display monitor in the X direction is;
in the Y direction is;
We strongly recommend you to match the pressed position data with the displayed position
The constant value in direct proportion of the resolution between the touch panel and the
II. User-Calibration
[
8 wires Touch Panel ]

2(V) / 5(V) x 1023 = 409 , (409-20) x (1023 / (1000-20)) = 406
Point-A
CX=(DXb-DXa)/(Xb-Xa) ---------------------- A)
CY=(DYb-DYa)/(Yb-Ya) ---------------------- B)
Point-B

SPEC 8.2.00
*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
y U
y U ref
y L ref
y L
x R ref
x L ref
x L
x R
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