AR1011 datasheet(5/61 Pages) MICROCHIP

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 2009-2016 Microchip Technology Inc.

DS40001393C-page 5

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

2.0

BASICS OF RESISTIVE

SENSORS

2.1

Terminology

ITO (Indium Tin Oxide) is the resistive coating that

makes up the active area of the touch sensor. ITO is a

transparent semiconductor that is sputtered onto the

touch sensor layers.

Flex or Film or Topsheet is the top sensor layer that a

user touches. Flex refers to the fact that the top layer

physically flexes from the pressure of a touch.

Stable or Glass is the bottom sensor layer that

interfaces against the display.

Spacer Adhesive is a frame of adhesive that connects

the flex and stable layers together around the perimeter

of the sensor.

Spacer

Dots

maintain

physical

and

electrical

separation between the flex and stable layers. The dots

are typically printed onto the stable layer.

Bus Bars or Silver Frit electrically connect the ITO on

the flex and stable layers to the sensor’s interface tail.

Bus bars are typically screen printed silver ink. They

are typically much lower in resistivity than the ITO.

X-Axis is the left and right direction on the touch sensor.

Y-Axis is the top and bottom direction on the touch

sensor.

Drive Lines supply a voltage gradient across the

sensor.

2.2

General

Resistive 4, 5, and 8-wire touch sensors consist of two

facing conductive layers, held in physical separation

from each other. The force of a touch causes the top

layer to deflect and make electrical contact with the

bottom layer.

Touch position measurements are made by applying a

voltage gradient across a layer or axis of the touch

sensor. The touch position voltage for the axis can be

measured using the opposing layer.

A comparison of typical sensor constructions is shown

below in Table 2-1.

The

AR1000

Series

Resistive

Touch

Screen

Controllers will work with any manufacturers of analog

resistive 4, 5 and 8-wire touch screens. The

communications and decoding are included, allowing

the user the quickest simplest method of interfacing

analog resistive touch screens into their applications.

The

AR1000

Series

was

designed

with

understanding of the materials and processes that

make up resistive touch screens. The AR1000 Series

Touch Controller is not only reliable, but can enhance

the reliability and longevity of the resistive touch

screen, due to its advanced filtering algorithms and

wide range of operation.

TABLE 2-1:

SENSOR COMPARISON

Sensor

Comments

4-Wire

Less expensive than 5-wire or 8-wire

Lower power than 5-wire

More linear (without correction) than

5-wire

Touch inaccuracies occur from flex layer

damage or resistance changes

5-Wire

Maintains touch accuracy with flex layer

damage

Inherent nonlinearity often requires touch

data correction

Touch inaccuracies occur from resistance

changes

8-Wire

More expensive than 4-wire

Lower power than 5-wire

More linear (without correction) than

5-wire

Touch inaccuracies occur from flex layer

damaged

Maintains touch accuracy with resistance

changes

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