WM9712L datasheet(70/77 Pages) WOLFSON

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WM9712L

Production Data

PD Rev 4.5 August 2006

controls the input signal of the auxiliary DAC.

REG

ADDR

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

XSLE

Selects input for AUXDAC. 0=from AUXDACVAL (for DC

signals), 1=from AC-Link slot (for AC signals)

14:12

AUXDACSLT

000 (Slot 5)

Selects input slot for AUXDAC (with XSLE=1)

64h

11:0

AUXDACVAL

000000000

AUXDAC Digital Input for AUXDAC (with XSLE=0). 000h=

minimum, FFFh=full-scale

Auxiliary DAC

Registers 76h, 78h and 7Ah

control the touchpanel interface.

REG

ADDR

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

POLL

Writing “1” starts a measurement (this bit resets itself)

14:12

ADCSEL

000 (none)

Selects measurement type

COO

0 (OFF)

Enables co-ordinate mode

CTC

0 (polling)

Enables continuous conversions

9:8

00 (93.75Hz)

Controls conversion rate in continuous mode

7:4

DEL

0000 (20.8

µs)

Controls touchpanel settling time

SLEN

Enables slot readback of touchpanel data

76h

2:0

SLT

Selects time slot for readback of touchpanel data

15:14

PRP

Selects mode of operation. 00=OFF, 01=pen detect with

wake-up, 10=pen detect without wake-up, 11=running

RPR

Selects wake-up mode. 0=AC-Link only, 1=AC-Link and

WM9712L auto-wake-up

45W

0 (4-wire)

Selects 4-wire or 5-wire touchpanel

PDEN

0 (always)

Selects when touchpanel measurements take place.

0=always, 1=only when pen is down

WAIT

Controls data readback from register 7Ah. 0=overwrite old

data with new, 1=wait until old data has been read

PIL

0 (200

µA)

Controls current used for pressure measurement. 1=400

µA

7:6

MSK

00 (OFF)

Controls MASK feature

78h

5:0

RPU

000001 (64k

Ω)

Controls internal pull-up resistor for pen-down detection

PNDN

0 (pen up)

Indicates pen status.

14:12

ADCSRC

000 (none)

Indicates measurement type

7Ah

read

only

11:0

ADCD

000h

Returns data from touchpanel / AUXADC

Touchpanel

Interface

are read-only registers that indicate to the driver that the codec is a WM9712L.

REG

ADDR

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

15:8

F7:0

57h

ASCII character “W” for Wolfson

7Ch

7:0

S7:0

4Dh

ASCII character “M”

15:8

T7:0

4Ch

ASCII character “L”

7Eh

7:0

REV7:0

12h

12 for WM9712L

Intel’s AC’97

Component

Specification,

Revision 2.2,

page 50

WM9712L Datasheet(PDF) 70 Page - Wolfson Microelectronics plc

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