WM9713 datasheet(45/111 Pages) WOLFSON

45 / 111 page

Preliminary Technical Data

WM9713L

PTD, March 2004, Rev 2.2

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

4:2

MCDTHR

000

Mic current detect threshold

000:100uA

001:200uA

….100uA steps up to

111:800uA

These values are for 3.3V supply and scale

with supply voltage (AVDD).

22h

1:0

MCDSCTR

Mic current detect short circuit threshold

00: 600uA

01: 1200uA

10: 1800uA

11: 2400uA

These values are for 3.3V supply and scale

with supply voltage (AVDD).

Table 24 Microphone Current Detect Control

MICROPHONE PGAS

The microphone pre-amps MPA and MPB drive into two microphone PGAs whose gain is controlled

by register 0Eh. The PGA signals can be routed into the headphone mixers and the mono mixer, but

not the speaker mixer (to prevent forming a feedback loop) controlled by register 10h. When the PGA

signals are not selected as an input to any of the mixers the outputs of the PGAs are muted

automatically.

When not in use the microphone PGAs can be powered down using the Powerdown register bits MA

and MB (register 3Eh, bits [3:2]).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

12:8

MICAVOL

01000

(0dB)

MICA input gain

00000: +12dB

… (1.5dB steps)

11111: -34.5dB

0Eh

Mic PGA

Volume

4:0

MICBVOL

01000

(0dB)

MICB input gain

00000: +12dB

… (1.5dB steps)

11111: -34.5dB

Table 25 Microphone PGA Volume Control

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

MA2M

Mute MICA path to mono mixer

1: Mute, 0: No mute (ON)

MB2M

Mute MICB path to mono mixer

1: Mute, 0: No mute (ON)

MIC2MBST

Mic to mono mixer boost

0: 0dB, 1: +20dB

4:3

MIC2H

Mic to headphone mixers select

00: MICA and MICB

01: MICA only

10: MICB only

11: none (mutes microphone PGAs)

10h

MIC Routing

2:0

MIC2HVOL

010

(0dB)

Mic PGA to headphone mixers gain

000: +6dB

… (3dB steps)

111: -15dB

Table 26 Microphone PGA Routing Control

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