wm9713 Wolfson Microelectronics plc, wm9713 Datasheet - Page 65

• Manufacturer Part Number: wm9713
• Description: Ac?97 Audio + Touchpanel Codec
• Manufacturer: Wolfson Microelectronics plc

Pre-Production
TOUCHPANEL INTERFACE
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The WM9713L includes a touchpanel driver and digitiser circuit for use with 4-wire or 5-wire resistive
touchpanels. The following functions are implemented:
X co-ordinate measurement
Y co-ordinate measurement
Pen down detection, with programmable sensitivity
Touch pressure measurement (4-wire touchpanel only)
Auxiliary measurement from COMP1/AUX1 (pin 29), COMP2/AUX2 (pin 30), or
The touchpanel digitiser uses a very low power, 12-bit successive approximation type ADC. The
same ADC can also be used for battery and auxiliary measurements (see the “Battery Alarm and
Battery Measurement” and “Auxiliary ADC Inputs” sections).
An on-chip switch matrix connects each touchpanel terminal to the supply voltage TPVDD, to ground
(TPGND), or to the ADC input, as required.
Figure 24 Touchpanel Switch Matrix
WIPER/AUX4 (pin 12)
PP Rev 3.2 September 2008
WM9713L
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