AR1011-ISLASHML datasheet(10/61 Pages) MICROCHIP

10 / 61 page

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

DS40001393C-page 10

 2009-2016 Microchip Technology Inc.

3.2

4, 5, 8-Wire Sensor Selection

The desired sensor type of 4/8-wire or 5-wire is

hardware selectable using pin M2.

If 4/8-wire has been hardware-selected, then the

choice of 4-wire or 8-wire is software-selectable via the

TouchOptions Configuration register.

When 4/8-wire is hardware-selected, the controller

defaults to 4-wire operation. If 8-wire operation is

desired, then the TouchOptions Configuration register

must be changed.

3.3

4-Wire Touch Sensor Interface

Sensor tail pinouts can vary by manufacturer and part

number. Ensure that 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.

Connections to a 4-wire touch sensor are as follows

(See Figure 3-2).

FIGURE 3-2:

4-WIRE TOUCH SENSOR INTERFACE

Tie unused controller pins 5WSX-, SX+, SY-, and SY+

to VSS.

See

Section 3.8

“ESD

Considerations”

and

Section 3.9 “Noise Considerations”

for important

information regarding the capacitance of the controller

schematic hardware.

TABLE 3-1:

4/8-WIRE vs. 5-WIRE

SELECTION

Type

M2 pin

4/8-wire

VSS

5-wire

VDD

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