AS3421 datasheet(30/61 Pages) AMSCO

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AS3421 AS3422

Datasheet - R e g i s t e r D e s c r i p t i o n

Table 16. MIC_L Register

Name

Base

Default

MIC_L

2-wire serial

00h

Offset: 08h

Left Microphone Input Register

Configures the gain for the left microphone input and defines the microphone operation mode. This

Bit

Bit Name

Default

Access

Bit Description

MIC_MODE

R/W

Selects the microphone input mode

0: single ended stereo mode

1: mono differential mode

6:0

MICL_VOL<6:0>

000 0000

R/W

Volume settings for left microphone input, adjustable in 127 steps of

0.375dB

00 0000: MUTE

00 0001: -11.25 dB gain

00 0010: -10.875 dB gain

11 1110: 35.625 dB gain

11 1111: 36 dB gain

Table 17. MIC_R Register

Name

Base

Default

MIC_R

2-wire serial

00h

Offset: 09h

Right Microphone Input Register

Configures the gain for the right microphone input and enables register 08h & 09h. This register is reset at

POR.

Bit

Bit Name

Default

Access

Bit Description

MIC_REG_ON

R/W

Defines which registers are used for the microphone settings.

0: settings of register 30h and 31h are used

1: settings of register 08h and 09h are used

6:0

MICR_VOL<6:0>

000 0000

R/W

Volume settings for right microphone input, adjustable in 127 steps of

0.375dB

00 0000: MUTE

00 0001: -11.25B gain

00 0010: -10.875 dB gain

11 1110: 35.625 dB gain

11 1111: 36 dB gain

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