AS3658F-BCTP datasheet(147/158 Pages) AMSCO

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Table 183. Touchpannel Control Register Bits

Addr:112

Touchpad – control 1

This register controls the different modes of the Touchpad

Bit

Bit Name

Default

Access

Description

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Revision 1v13

146 - 157

AS3658

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

tpen_on

R/W

Enables Touch Pen Function

OFF (No wakeup on pen down)

Pen Detect enabled

wakes up Pen

Digitizer

Check Pen_Status -> if pen-

detect or tpen_soc_pd=1 and tpen_soc=1

then perform X,Y,Z measurements

2:1

tpen_convint

R/W

Conversion Interval Timer

No delay between conversions

every 512 clock periods (0,5 ms) ADC –

Averaging limited to max. 4

every 1024 clock periods (1ms) ADC –

Averaging limited to max. 8

every 10240 clock periods (10ms)

tpen_soc

R/W

Start Conversion (x,y, and z conversion)

No Conversion if pen down detected

Start Conversion if pen down detected or

tpen_soc_pd=1 and tpen_on=1 (X, Y and

Z-Pressure Measurement)

5:4

tpen_avg

R/W

Averaging of x and y measurement

no averaging

4 measurements (per channel)

8 measurements (per channel)

16 measurements (per channel)

tpen_eoc

R/W

ADC - End of Conversion bit

TP in Power down or Conversion ongoing

Valid TP data available (x,y, and pressure)

generates an interrupt on GPIO4_CURR4

and/or XINT; the interrupt is released when

the readout from the tpen_xmsb is started

tpen_st_pen

Pen status

penup

pendown

AS3658F-BCTP Datasheet(PDF) 147 Page - ams AG

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