WM9713LGEFLSLASHV datasheet(64/111 Pages) WOLFSON

64 / 111 page

WM9713L

Preliminary Technical Data

PTD, March 2004, Rev 2.2

POWER MANAGEMENT

To save power, the touchpanel digitiser and the pen-down detector can be independently disabled

when they are not used. The power consumption of the pen-down detector is normally negligible,

except when the pen is down.

The pen ADC is powered-down using PADCPD, register 3Ch bit 15.

The state of the digitiser and pen down detector is controlled by the following bits.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

3Ch

PADCPD

1 = off

Pen ADC power down

15:14

PRP

Pen ADC/AUX ADC enable

00 – Pen digitiser off, pen detect off, no

wake-up on pen down (default)

01 – Pen digitiser powered off, pen detect

enabled, touchpanel digitiser wakes up

(changes to state 11) on pen-down

10 – Pen digitiser off, pen detect enabled,

no wake-up on pen down

11 – Pen digitiser and pen detect enabled

78h

RPR

Wake-up on pen-down mode

0: Wake-up the AC-Link only (hold

SDATAIN high until controller sends warm

reset or cold reset)

1: Wake-up the WM9713L without waiting

for a reset signal from the controller

Table 46 Touchpanel Digitiser Control (Power Management)

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