TSC2014IYZGR datasheet(13/62 Pages) TI2

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PINTDAV

I C

Serial

Interface

and

Control

VDD/REF

X+

X-

Y+

Y-

AUX

TEMP

Mux

PENIRQ

DAV

SAR

ADC

Internal

Clock

Touch

Screen

Drivers

Interface

RESET

AD0

SCL

SDA

TSC2014

www.ti.com

SBAS484B – SEPTEMBER 2010 – REVISED DECEMBER 2016

Product Folder Links: TSC2014

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7 Detailed Description

7.1 Overview

The TSC2014 is an analog interface circuit for a human interface touch screen device. A register-based

architecture eases integration with microprocessor-based systems through a standard I2C bus. All peripheral

functions are controlled through the registers and onboard state machines. The TSC2014 features include:

•

Very low-power touch screen controller

•

Very small onboard footprint

•

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

•

Ability to work on very low supply voltage

•

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

•

Miniature, yet complete; requires no external supporting component.

•

Enhanced ESD protection

The TSC2014 consists of the following blocks (refer to the block diagram.

•

Touch Screen Interface

•

Auxiliary Input (AUX)

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Temperature Sensor

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Acquisition Activity Preprocessing

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Internal Conversion Clock

•

I2C Interface

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 TSC2014 supports the resistive 4-wire configurations, as shown in Figure 16. The circuit determines location

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

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