TSC2007 datasheet(12/43 Pages) TI2

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PENIRQ

I C

Serial

Interface

and

Control

SCL

SDA

A[0:1]

X+

X-

Y+

Y-

AUX

TEMP

Mux

VDD/REF

GND

SAR

ADC

Internal

Clock

Touch

Screen

Drivers

Interface

TSC2007-Q1

SBAS545A – SEPTEMBER 2011 – REVISED DECEMBER 2016

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7 Detailed Description

7.1 Overview

The TSC2007-Q1 is an analog interface circuit for a human interface touch screen devices. All peripheral

functions are controlled through the command byte and onboard state machines. The TSC2007-Q1 features

include:

•

Very low-power touch screen controller

•

Very small onboard footprint

•

Relieves host from tedious routine tasks by preprocessing, thus saving resources for more critical tasks

•

Ability to work on very low supply voltage

•

Minimal connection interface allows easy isolation and reduces the number of dedicated I/O pins required

•

Miniature, yet complete; requires no external supporting components

•

Enhanced electrostatic discharge (ESD) protection

The TSC2007-Q1 consists of the following blocks (see Functional Block Diagram):

•

Touch Screen Sensor Interface

•

Auxiliary Input (AUX)

•

Temperature Sensor

•

Acquisition Activity Preprocessing

•

Internal Conversion Clock

•

I2C Interface

Communication with the TSC2007-Q1 is done through an I2C serial interface. The TSC2007-Q1 is an I2C slave

device; therefore, data are shifted into or out of the TSC2007-Q1 under control of the host microprocessor, which

also provides the serial data clock.

Control of the TSC2007-Q1 and its functions is accomplished by writing to the command register of an internal

state machine. A simple command protocol compatible with I2C is used to address this register.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Touch Screen Operation

A resistive touch screen operates by applying a voltage across a resistor network and measuring the change in

resistance at a given point on the matrix where the screen is touched by an input (stylus, pen, or finger). The

change in the resistance ratio marks the location on the touch screen.

The TSC2007-Q1 supports resistive 4-wire configurations, as shown in Figure 35. The circuit determines location

in two coordinate pair dimensions, although a third dimension can be added for measuring pressure.

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