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