AS3421 datasheet(40/61 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 33. MIC_MON Register

Name

Base

Default

MIC_MON

2-wire serial

00h (OTP)

Offset: 32h

OPT Microphone Monitor Mode Register

Configures the gain for the microphone input in monitor mode. This is a special register, writing needs to

be enabled by writing 10b to Reg 3Fh first. This register is reset at POR and gets loaded with the OTP

fuse contents.

Bit

Bit Name

Default

Access

Bit Description

MON_MODE

R/W

0: monitor mode is working with fixed microphone gain

1: monitor mode uses adjustable gain via the VOL pin

6:0

MIC_MON_OTP

<6:0>

000 0000

R/W

Volume settings for microphone input during monitor mode, adjustable in

127 steps of 0.375dB. If MON_MODE bit is set to 1 the gain can be further

adjusted via the VOL pin.

00 0000: MUTE

00 0001: -11.25dB gain

00 0010: -10.875 dB gain

11 1110: 35.625dB gain

11 1111: 36 dB gain

Table 34. AUDIO_SET Register

Name

Base

Default

AUDIO_SET

2-wire serial

00h (OTP)

Offset: 33h

OPT Audio Setting Register

Configures the audio settings. This is a special register, writing needs to be enabled by writing 10b to Reg

3Fh first. This register is reset at POR and gets loaded with the OTP fuse contents.

Bit

Bit Name

Default

Access

Bit Description

NO_PB_MODE

R/W

This bit defines if the low power music playback mode is enabled or not. In

case the bit is set to ‘0’, music playback mode can be entered by pulling the

ANC_CSDA pin low. In case the bit is set to ‘1’ the music playback mode is

disabled. Pulling the ANC_CSDA pin low has no influence.

0: Music playback mode enabled

1: Music playback mode disabled

VOL_BUTTON_MODE

R/W

If bit is set to ‘1’ the ANC_CSDA pin allows the user to control the line input

gain via push-buttons. If bit is set to ‘0’, the volume control is disabled.

Please mind that if VOL_BUTTON_MODE bit is set to ‘1’ entering music

playback mode via ANC_CSDA pin is not possible any more.

0: Volume mode via push-button disabled

1: Volume mode via push-button enabled

LINE_GAIN_+3dB_OTP

R/W

Selects the line input operating gain range. If this bit is set the gain range of

the line input amplifiers is shifted by +3dB.

0: Line Input gain range from -46.5dB...0dB

1: Line Input gain range from -43.5dB...+3dB

MIC_MODE_OTP

R/W

0: microphone input stage operating in single ended mode

1: normal operating in mono balanced

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