TSC2301_15 Datasheet, PDF (48/94 Pages) Texas Instruments – PROGRAMMABLE TOUCH SCREEN CONTROLLER

TSC2301
SLAS371D – SEPTEMBER 2002 – REVISED AUGUST 2004
Screen
Touch
Touch Screen Scan Z Coordinate Host Initiated
Issue Interrupt
PENIRQ
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N
Is PENSTS =1
Go To Host
Controlled
Conversion
Host Writes A/D
Converter Control
Register
Reset PENIRQ
DONE
N
Are Drivers On
Start Clock
Power up ADC
Convert Z1
coordinates
Start Clock
Turn On Drivers: Y+, X -
N
Is Panel
Voltage
Stabilization
Done
Y
N
Is Data
Averaging
Done
Y
Store Z1 Coordinates
in Z1 Register
Convert Z2
coordinates
N
Is Data
Averaging
Done
Y
Store Z2 Coordinates
in Z2 Register
Power Down ADC
Set /DAV = 0
Turn off clock
DONE
Figure 57. Z Coordinate Reading Initiated by Host
Conversion Controlled by the Host
In this mode, the TSC2301 detects when the touch panel is touched and causes the PENIRQ line to go low. The
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