LM4931ITLSLASHNOPB datasheet(13/50 Pages) TI2

13 / 50 page

LM4931

www.ti.com

SNAS251E – APRIL 2004 – REVISED MAY 2013

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

SOFTRESET

If set, resets the LM4931, excluding the I2C/SPI registers and PLL. SOFTRESET should be cleared

to resume normal operation.

DAC_

Disables the audio DAC dither.

DITHER_OFF

BYPASS_BYPASS

If set the power management and control circuit will assume that bypass is at VDD/2 even when

such condition is false(2).

RSVD

RESERVED(3)

(2)

It is recommended to alter this bit only while the part is in Powerdown mode.

(3)

Reserved bits should be set to zero when programming the associated register.

Voice Codec Configuration Register

This register configures the voiceband codec, sidetone attenuation, and selected control functions.

Table 4. DEFAULT CHART FOR VOICE_CONFIG (01h)

DATA BIT

DEFAULT

Table 5. VOICE_CONFIG (01h) (SET = LOGIC 1, CLEAR = LOGIC 0)

Address

Description

3:0

SIDETONE_ATTEN

Programs the attenuation of the digital sidetone. Attenuation is set as follows:

3:0

Sidetone

3:0

Sidetone Attenuation

Attenuation

0000

Mute

1000

–9dB

0001

–30dB

1001

–6dB

0010

–27dB

1010

–3dB

0011

–24dB

1011

0dB

0100

–21dB

1100

0dB

0101

–18dB

1101

0dB

0110

–15dB

1110

0dB

0111

–12dB

1111

0dB

AUTO_SIDE

This will automatically disable the sidetone when in a VOICE over loudspeaker mode except when

the headphone is connected and the loudspeaker is muted by the HP_SENSE control.

RSVD

RESERVED(1)

VADC_DITHER_OFF

Disables the Voice ADC dither.

VDAC_DITHER_OFF

Disables the Voice DAC dither.

(1)

Reserved bits should be set to zero when programming the associated register.

Microphone Gain Registers

This register is used to control the gain of the microphone preamplifier.

Table 6. DEFAULT CHART FOR MIC_GAIN (02h)

DATA BIT

DEFAULT

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