WM9714CLGEFLSLASHV datasheet(48/120 Pages) CIRRUS

48 / 120 page

WM9714L

Rev 4.0

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

22h

4:2

MCDTHR

000

Mic Detect Threshold Control

000 = 100µA

… (100µA steps)

111 = 800µA

Note: These values are for 3.3V supply and

scale with supply voltage (AVDD).

1:0

MCDSCTR

Mic Detect Short Circuit Threshold

Control

00 = 600µA

01 = 1200uA

10 = 1800uA

11 = 2400µA

Note: These values are for 3.3V supply and

scale with supply voltage (AVDD).

Table 25 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. If 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

0Eh

Mic PGA

Volume

12:8

MICAVOL

01000

(0dB)

MICA PGA Volume Control

00000 = +12dB

… (1.5dB steps)

11111 = -34.5dB

4:0

MICBVOL

01000

(0dB)

MICB PGA Volume Control

00000 = +12dB

… (1.5dB steps)

11111 = -34.5dB

Table 26 Microphone PGA Volume Control

WM9714CLGEFL/V Datasheet(PDF) 48 Page - Cirrus Logic

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