AS3421 datasheet(37/61 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 27. ANC_L4 Register

Name

Base

Default

ANC_L4

2-wire serial

80h (OTP)

Offset: 14h

Left OTP Microphone Input Register (4th OTP option)

Configures the gain for the left microphone input. 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

TEST_BIT_7

for testing purpose only

6:0

MICL_VOL_OTP4

<6:0>

000 0000

R/W

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

0.375dB

00 0000: MUTE

00 0001: -11.25dB gain

00 0010: -10.875 dB gain

11 1110: 35.625dB gain

11 1111: 36 dB gain

Table 28. ANC_R4 Register

Name

Base

Default

ANC_R4

2-wire serial

00h (OTP)

Offset: 15h

Right OTP Microphone Input Register (4th OTP option)

Configures the gain for the left microphone input. 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

ALT3_LOCK

R/W

0: additional bits can be fused inside register 14h & 15h

1: OTP fusing for register 14h & 15h gets locked, no more changes can be

done.

6:0

MICR_VOL_OTP4

<6:0>

000 0000

R/W

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

0.375dB

00 0000: MUTE

00 0001: -11.25dB gain

00 0010: -10.875 dB gain

11 1110: 35.625dB gain

11 1111: 36 dB gain

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