TSC2000_08 datasheet(21/35 Pages) TI

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TSC2000

SBAS257

FIGURE 10. X- and Y-Coordinate Touch Screen Scan, Initiated by Host.

Screen

Touch

Issue Interrupt

PENIRQ

Go to Host-Controlled

Conversion

Touch Screen Scan

X and Y

Host Initiated

Done

Yes

Is Data

Averaging Done

Is Screen

Touched

Is Panel Voltage

Stabilization Done

Turn On Drivers: Y+, Y–

Start Clock

Reset PENIRQ

Store Y-Coordinates in

Y-Register

Power Down A/D Converter

Power Up A/D Converter

Reset PENIRQ and

Scan Trigger

Turn Off Clock

Convert Y-Coordinates

Is PSM = 1

Yes

Is Screen

Touched

Yes

Is Panel Voltage

Stabilization Done

Convert X-Coordinates

Turn On Drivers: X+, X–

Power Up A/D Converter

Yes

Is Data

Averaging Done

Store X-Coordinates

in X-Register

Power Down A/D Converter

Turn Off Clock

Issue Data Available

Done

Host Writes A/D

Converter

Control Register

Conversion Controlled by TSC2000 Initiated By

Host Responding to PENIRQ

In this mode, the TSC2000 will detect when the touch panel is

touched and cause the PENIRQ line to go LOW. The host will

recognize the interrupt request, and then write to the A/D

Converter Control register to select one of the touch screen

scan functions. The conversion process then proceeds as

described above, and as outlined in Figures 10 through 14.

The main difference between this mode and the previous

mode is that the host, not the TSC2000, decides when the

touch screen scan begins.

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