Datasheet

25
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TSC2000
SBAS257
FIGURE 14. Z-Coordinate Reading Initiated by Host.
Screen
Touch
Host Writes A/D
Converter
Control Register
Issue Interrupt
PENIRQ
Go to Host-Controlled
Conversion
Touch Screen Scan
Z-Coordinate
Host Initiated
No
No
Yes
Yes
Yes
No
No
Is Data
Averaging Done
Is Panel Voltage
Stabilization Done
Turn On Drivers: Y+, X–
Start Clock
Reset PENIRQ
Store Z
1
-Coordinates
in Z
1
-Register
Power Up A/D Converter
Are Drivers On
Start Clock
Convert Z
1
-Coordinates
Yes
No
Is Data
Averaging Done
Store Z
2
-Coordinates
in Z
2
-Register
Power Down A/D Converter
Issue Data Available
Convert Z
2
-Coordinates
Is PSM = 1
Done
Done
Turn Off Clock