LM4931

SNAS251E – APRIL 2004 – REVISED MAY 2013

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Table 1. SYSTEM CONTROL TABLE

Address

Register Name

Description

00000000

BASIC_CONFIG

Controls the output mode configuration

00000001

VOICE_CONFIG

Controls the settings for the voice codec

00000010

MIC_GAIN

Controls the gain and muting of the

microphone pre-amplifier

00000011

HP_GAIN

Controls the gain and muting of the

headphone amplifier

00000100

LS_GAIN

Controls the gain and muting of the

loudspeaker amplifier

00000101

PLL_M

Sets the PLL input divider

00000110

PLL_N

Sets the PLL feedback divider

00000111

PLL_P

Sets the PLL output divider

00001000

CLK_MUX

Configures the clock divider

00001001

INTERFACES

Controls the format of the PCM, I2S and

GPIO interfaces

00001010

PMC_CONFIG

Controls the power management functions

Basic Configuration Register

This register used to configure the basic function of the chip.

Table 2. DEFAULT CHART FOR BASIC_CONFIG (00h)

DATA BIT

7

6

5

4

3

2

1

0

DEFAULT

0

0

0

0

0

0

0

0

Table 3. BASIC_CONFIG (00h) (SET = LOGIC 1, CLEAR = LOGIC 0)

Address

Register

Description

3:0

MODE

The LM4931 can be placed in one of several modes that dictate the basic operation. When a new

mode is selected the LM4931 will change operation silently and will reconfigure the power

management profile automatically. The modes are described as follows(1):

3:0

Mono Speaker

Headphone Left

Headphone

Comment

Amplifier Source Source

Right Source

0000

None

None

None

Powerdown mode

0001

None

None

None

Standby mode

0010

Voice

None

None

Mono speaker

mode

0011

None

Voice

Voice

Headphone call

mode

0100

Voice

Voice

Voice

Conference call

mode

0101

Audio (L+R)

None

None

L+R mixed to mono

speaker

0110

None

Audio (Left)

Audio (Right)

Headphone stereo

audio

0111

Audio (L+R)

Audio (Left)

Audio (Right)

L+R mixed to mono

speaker + stereo

headphone audio

1000

Audio (Left)

Voice

Voice

Mixed mode

1001

Voice + Audio

Voice

Voice

Mixed mode

(Left)

1010

Voice

Audio (Left)

Audio (Left)

Mixed mode

(1)

Modes 8, 9, and 10 are only available if the sample rate of the I2S is an integer multiple of the sample rate of the PCM. For example,

48kHz (I2S) and 8kHz (PCM) would be acceptable.

12

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