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AS3418

Datasheet

• PUBLIC

DS000507

• v4-00 • 2020-Jan-23

│ 52

Addr: 0x03

MODE_REG1

Bit

Bit Name

Default

Access

Bit Description

0: MIC charge pump bypass function disabled

1: MIC charge pump bypass function enabled

ANCMON_MI

CS_CP_ON

R/W

This bit controls the microphone supply charge

pump. The microphone charge pump has a second

function besides the bias voltage generation for

microphones. It is also used to disable the integrated

music bypass switch if the AS3418 is active. In case

the integrated bypass switch is used in an application

this bit must not be set to ‘0’.

0: Microphone supply charge pump disabled

1: Microphone supply charge pump enabled

WARNING: Microphone supply is also used for

disabling the Bypass switch. If Microphone supply is

disabled an external supply is required.

ANCMON_MI

CS_LDO_ON

R/W

This bit controls the microphone supply. In case this

bit is set to ‘1’ the microphone supply voltage

regulator (MICS output pin) is powered up.

0: Microphone supply switched off

1: Microphone supply switched on

ANCMON_MI

C_ON

R/W

This bit powers up the microphone preamplifier.

0: Microphone preamplifier disabled

1: Microphone preamplifier enabled

ANCMON_HP

H_ON

R/W

This bit allows the user to power down headphone

amplifier in case it is not used in the final application

in order to save system power.

0: Headphone amplifier disabled

1: Headphone amplifier enabled

Figure 71:

MICS_VOLTAGE Register Description

Addr: 0x04

MICS_VOLTAGE

Bit

Bit Name

Default

Access

Bit Description

MICS_LDO_C

V_MODE

Signals if the MICS_LDO is in constant voltage

mode.

1: Constant voltage mode active

0: Constant voltage mode inactive

MICS_LDO_C

D_MODE

Signals if the microphone supply is in constant drop

mode

1: Constant drop mode active

0: Constant drop mode inactive

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