LM4931 datasheet(13/47 Pages) NSC

Part #	LM4931

Description	Audio Subsystem with Mono High Efficiency Loudspeaker and Stereo Headphone Amplifiers

PDF	47 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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13 / 47 page

System Control (Continued)

When the part is configured as an I

2C device then the LM4931 will respond to one of two addresses, according to the ADDR input.

If ADDR is low then the address portion of the I

2C transaction should be set to write to 0010000. When ADDR is high then the

address input should be set to write to 1110000. The LM4931 uses the following 11 registers to store configuration information:

SYSTEM CONTROL TABLE

Address

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, I

2S and GPIO interfaces

00001010

PMC_CONFIG

Controls the power management functions

LM4931 Datasheet(PDF) 13 Page - National Semiconductor (TI)

LM4931 Datasheet(HTML) 13 Page - National Semiconductor (TI)

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