AS3517H-ECTP datasheet(63/94 Pages) AMSCO

63 / 94 page

AS3517 V17

Data Sheet, Confidential

www.austriamicrosystems.com

Table 55 MIC2_R Register

Name

Base

Default

MIC2_R

2-wire serial

00h

Right Microphone Input 2 Register

Offset: 08h

Configures the gain from microphone 2 amplifier output up to mixer input (Σ).

This register is reset when the block is disabled in AudioSet1 register (14h) or at a

DVDD-POR. The register cannot be written when the block is disabled.

Bit

Bit Name

Default

Access

Bit Description

MIC2_AGC_OFF

R/W

Control of limiter AGC (automatic gain control). Limits high

dynamic range of electrete/MEMS microphone (e.g. user

shouts or blows into microphone)

0: automatic gain control enabled

1: automatic gain control disabled

6:5

PRE2_Gain

R/W

Sets the gain of the microphone 2 preamplifier (gain from

microphone inputs to N5)

00: gain set to 28 dB

01: gain set to 34 dB

10: gain set to 40 dB

11: reserved, do not use.

4:0

M2R_VOL

00000

R/W

volume settings for right microphone input 2, adjustable in 32

steps @ 1.5dB; gain from microphone amplifier (N4) to mixer

input (N12)

11111: 6 dB gain

11110: 4.5 dB gain

00001: -39 dB gain

00000: -40.5 dB gain

Table 56 MIC2_L Register

Name

Base

Default

MIC2_L

2-wire serial

00h

Left Microphone Input 2 Register

Offset: 09h

Configures the gain from microphone 2 amplifier output up to mixer input (Σ) and

controls MUTE switch E.

This register is reset when the block is disabled in AudioSet1 register (14h) or at a

DVDD-POR. The register cannot be written when the block is disabled.

Bit

Bit Name

Default

Access

Bit Description

M1SUP_OFF

R/W

0: microphone 2 supply enabled

1: microphone supply disabled

MUTE_OFF_D

R/W

Control of MUTE switch D

0: microphone input 2 set to mute

1: normal operation

RDET2_OFF

R/W

Disables the microphone 2 detect function (30kOhm pull-up

from MIC1S to AVDD) to use the terminal as ADC-10 input

0: microphone 1 detection enabled

1: microphone detection disabled

4:0

M2L_VOL

00000

R/W

volume settings for left microphone 2 input, adjustable in 32

steps @ 1.5dB; gain from microphone amplifier (N4) to mixer

input (N13)

11111: 6 dB gain

11110: 4.5 dB gain

00001: -39 dB gain

00000: -40.5 dB gain

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