AS3658F-BCTP datasheet(144/158 Pages) AMSCO

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AS3658

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

10.10 Touchpen Interface

The touchpen interface controls a resistive touchpen. It has the following features:

Low Power Pen Detect

Measure pen X,Y position

Measure pen pressure (Z-position)

Interrupt, if X,Y,Z data is available; one dedicated output – CURR4_GPIO4 can be configured to be used as

touchpen interrupt output and/or standard interrupt output XINT

The conversion interval can be adjusted

Up to 16 ADC conversion can be averaged internally

The sample time of the ADC can be adjusted

The pin CURR3_GPIO3 can be configured to enable/disable the ADC conversion (useful if the processor updates

the LCD to avoid parallel reading of the touchpen position)

The touchpen interface shares the pins with the SPDIF output and the I2S Output 3. If the touchpen interface is used,

the SPDIF and the I2S Output 3 cannot be used (and has to be disabled).

Note: The touchpen interface and the ‘General Purpose 10 Bit ADC’ can be used at the same time.

Figure 59. Touchpen Block diagram

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