TSC2000 datasheet(8/38 Pages) TI1

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TSC2000

SBAS257

FIGURE 1. Typical Circuit Configuration.

OVERVIEW

The TSC2000 is an analog interface circuit for human inter-

face devices. A register-based architecture eases integration

with microprocessor-based systems through a standard SPI

bus. All peripheral functions are controlled through the reg-

isters and onboard state machines.

The TSC2000 consists of the following blocks (refer to the

block diagram on the front page):

•

Touch Screen Interface

•

Battery Monitors

•

Auxiliary Inputs

•

Temperature Monitor

•

Current Output D/A Converter

Communication to the TSC2000 is via a standard SPI serial

interface. This interface requires that the Slave Select signal be

driven LOW to communicate with the TSC2000. Data is then

shifted into or out of the TSC2000 under control of the host

microprocessor, which also provides the serial data clock.

Control of the TSC2000 and its functions is accomplished by

writing to different registers in the TSC2000. A simple com-

mand protocol is used to address the 16-bit registers. Reg-

isters control the operation of the A/D converter and D/A

converter.

The result of measurements made will be placed in the

TSC2000’s memory map and may be read by the host at any

time. Three signals are available from the TSC2000 to indicate

that data is available for the host to read. The DAV output

indicates that an A/D conversion has completed and that data

is available. The PENIRQ output indicates that a touch has

been detected on the touch screen. A typical application of the

TSC2000 is shown in Figure 1.

Auxiliary Input

Pen Interrupt Request

Serial Data Out

Data Available

Serial Data In

Slave Select

Serial Clock

µF

(Optional)

+2.7V to +3.3V

Touch

Screen

0.1

µF

X+

Y+

X–

Y–

GND

BAT1

BAT2

REF

AUX1

AUX2

ARNG

OUT

PENIRQ

MISO

DAV

MOSI

SCLK

TSC2000

µF

(Optional)

0.1

µF

Main

Battery

Secondary

Battery

LCD Contrast

Voltage

Regulator

RRNG

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