AR1010T-ISLASHML datasheet(14/70 Pages) MICROCHIP

14 / 70 page

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

DS41393B-page 14

Preliminary

 2009-2012 Microchip Technology Inc.

3.5

8-Wire Touch Sensor Interface

Sensor tail pinouts can vary by manufacturer and part

number. Ensure both sensor tail pins for one sensor

axis (layer) are connected to the controller’s X-/X+ pins

and the tail pins for the other sensor axis (layer) are

connected to the controller’s Y-/Y+ pins.

The controller’s X-/X+ and Y-/Y+ pin pairs do not need

to connect to a specific sensor axis. The orientation of

controller pins X- and X+ to the two sides of a given

sensor axis is not important. Likewise, the orientation of

controller pins Y- and Y+ to the two sides of the other

sensor axis is not important.

The 8-wire sensor differs from a 4-wire sensor in that

each edge of an 8-wire sensor has a secondary

connection brought to the sensor’s tail. These

secondary connections are referred to as “sense” lines.

The controller pins associated with the sense line for an

8-wire sensor contain an ‘S’ prefix in their respective

names. For example, the SY- pin is the sense line

connection associated with the main Y- pin connection.

Consult with the sensor manufacturer’s specification to

determine which member of each edge connected pair

is the special 8-wire “sense” connection. Incorrectly

connecting the sense and excite lines to the controller

will adversely affect performance.

The controller requires that the main and “sense” tail

pin pairs for sensor edges be connected to controller

pin pairs as follows:

• Y- and SY-

• Y+ and SY+

• X- and 5WSX-

• X+ and SX+

Connections to a 8-wire touch sensor are shown in

Figure 3-4 below.

FIGURE 3-4:

8-WIRE TOUCH SENSOR INTERFACE

See

Section 3.8

“ESD

Considerations”

and

Section 3.9 “Noise Considerations” for important

information regarding the capacitance of the controller

schematic hardware.

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