AS3543 datasheet(65/92 Pages) AMSCO

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AS3543 3v2

Data Sheet - R e g i s t e r D e f i n i t i o n

Table 56. AudioSet2 Register

Name

Base

Default

AudioSet2

2-wire serial

00h

Offset: 15h

Second Audio Set Register

Control of various audio blocks. This register is reset at a AVDD27-POR.

Bit

Bit Name

Default

Access

Bit Description

BIAS_OFF

R/W

Power-down of the AGND bias if only digital data transfer and

PMU functions are used.

0: bias enabled

1: bias disabled, for power saving in non audio mode

SUM_OFF

R/W

0: Mixer stage enabled

1: Mixer stage powered down

SUM_AGC_OFF

R/W

Switches the signal limiter OFF (N20/N21)

0: automatic gain control for summing stage enabled

1: automatic gain control for summing stage disabled

SUM_HP_HIQ

R/W

0: mixer and headphone stage in low power mode

1: mixer and headphone stage in high quality mode

3:2

GAIN_STEP<1:0>

R/W

Sets the transition time of the auto fading for the output stage

00: 2ms/step

01: 4ms/step

10: 8ms/step

11: auto fading off

1:0

VMICS<1:0>

R/W

Sets the microphone supply output voltage

00: AVDD17*20/17

01: AVDD17*20/22

10: AVDD17*20/27

11: AVDD17*20/32

Table 57. AudioSet3 Register

Name

Base

Default

AudioSet3

2-wire serial

00h

Offset: 16h

Third Audio Set Register

Control of mixer stage inputs and headphone. This register is reset at a AVDD27-POR.

Bit

Bit Name

Default

Access

Bit Description

n/a

MICMIX_OFF

R/W

0: microphone input to ΣR and ΣL (N12/N13) on

1: microphone input to mixer disabled

n/a

ADCMIX_ON

R/W

0: ADC input to mixer disabled

1: ADC input to ΣR and ΣL (N12/N13) on

LINMIX_OFF

R/W

0: line input to ΣR and ΣL (N12/N13) on

1: line input to mixer disabled

HP_FASTSTART

R/W

0: normal operation

1: shortens delay for start-up when using 220nF on HPGND

HP_BIAS

R/W

0: 100%

1: 150%, increased bisas for lower noise and THD

HPCM_ON

R/W

0: headphone common mode buffer is switched off

1: headphone common mode buffer is powerd up

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