TSC2000IPW datasheet(20/34 Pages) TI

20 / 34 page

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TSC2000

SBAS257

FIGURE 9. X-, Y-, and Z-Coordinate Touch Screen Scan, Initiated by Touch.

Screen

Touch

Issue Interrupt

PENIRQ

Go to Host-Controlled

Conversion

Touch Screen Scan

X, Y, and Z

PENIRQ Initiated

Done

Yes

Is Data

Averaging Done

Is Screen

Touched

Is Panel Voltage

Stabilization Done

Turn On Drivers: Y+, Y–

Start Clock

Store Y-Coordinates in

Y-Register

Power Down A/D Converter

Power Up A/D Converter

Reset PENIRQ and

Scan Trigger

Turn Off Clock

Done

Reset PENIRQ and

Scan Trigger

Turn Off Clock

Convert Y-Coordinates

Is PSM = 1

Yes

Is Panel Voltage

Stabilization Done

Convert Z

1-Coordinates

Turn On Drivers: Y+, X–

Power Up A/D Converter

Yes

Is Data

Averaging Done

Done

Yes

Is Screen

Touched

Is Data

Averaging Done

Yes

Convert Z

2-Coordinates

Store Z

2-Coordinates

in Z

2-Register

Reset PENIRQ and

Scan Trigger

Power Down A/D Converter

Turn Off Clock

Issue Data Available

Is Screen

Touched

Yes

Is Panel Voltage

Stabilization Done

Convert X-Coordinates

Turn On Drivers: X+, X–

Power Up A/D Converter

Is Data

Averaging Done

Store X-Coordinates

in X-Register

Power Down A/D Converter

Store Z

1-Coordinates

in Z

1-Register

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