AS3658F-BCTP datasheet(145/158 Pages) AMSCO

Part #	AS3658F-BCTP

Description	Power and Audio Management Unit for Portable Devices

PDF	158 Pages

Scroll/Zoom	100%

Manufacturer	AMSCO [ams AG]

Direct Link	http://www.ams.com

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AS3658

Data Sheet Confidential - Deta il ed Descri ption - System Functi ons

The touchpen controller is operating according to the following state diagram:

Figure 60. Touchpen State diagram

10.10.1 Software guidelines

1. Setup the configuration registers (tpen – control 1..3) according the hardware

2. Enable receiving of touchpen interrupts (either through XINT or GPIO4_CURR4)

3. Upon receiving of a touchpen interrupt, readout tpen_xmsb, tpen_ymsb (and if required tpen_pressmsb and

tpen_xypresslsb) with a single I2C blockread. This ensured, that the x,y,z is correctly readout and all data belong

to one single touchpen x,y,z conversion

4. Perform all the required processing with the data (e.g. accept a pen-down only if the pen is forced onto the

touchscreen with a minimum pressure [z-position])

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AS3658F-BCTP Datasheet(PDF) 145 Page - ams AG