Cirrus-logic CS42L73 Manuale Utente Scaricare il pdf (Pagina 86)

86 DS882F1

CS42L73

6.8 Output Load, Mic Bias, and MIC2 Short Detect Configuration (Address 0Ah)

6.8.1 VP Supply Minimum Voltage Setting

Configures the mic bias generation circuitry to accept the VP supply with the specified minimum value.

Notes:

•Refer to “Recommended Operating Conditions” on page 19 for definitions of the lower and

higher minimum voltages.

•Note 3 on page 19 explains how to use the VP_MIN control.

• See “Mic BIAS Characteristics” on page 26 details how selecting the lower minimum volt-

age mode reduces the mic biases PSRR.

• If a mic path is active, it is recommended that the path be muted before changing the VP_

MIN setting to avoid audible artifacts.

6.8.2 Speakerphone Light Load Mode Enable

Configures the Speakerphone Driver to minimize power consumption. When the CS42L73 Speakerphone

output is used as a line driver to a light load, such as an external amplifier, quiescent power consumption

is reduced by setting this control.

Note: R

is defined in spec. table “Serial Port-to-Mono Speakerphone Output Characteristics” on

page 31

6.8.3 Mic Bias Output Control

Sets the mode for the MIC1_BIAS and MIC2_BIAS device outputs.

Note: If either PDN or PDN_MICx_BIAS are set to powered down, the MICx_BIAS output will be Hi-Z,

regardless of the MIC_BIAS_CTRL setting.

6.8.4 Short Detect Automatic Mute Control

Configures the reaction to MIC2 Short Detect events.

76543210

Reserved VP_MIN SPK_LITE_

LOAD

MIC_BIAS_

CTRL

SDET_AMUTE Reserved Reserved Reserved

VP_MIN VP Supply Minimum Voltage

0 Lower Voltage

1 Higher Voltage

SPK_LITE_LOAD Light Load Mode Speakerphone Loading Applicable R

Range

0 Disabled Heavy R

 R

L(max)

with SPK_LITE_LOAD = 0 b

1 Enabled Light R

 R

L(min)

with SPK_LITE_LOAD = 1 b

MIC_BIAS_CTRL Mic 1 and 2 Bias Status (When Powered Up)

0 Output Voltage as per “Mic BIAS Characteristics” on page 26.

SDET_AMUTE Reaction To MIC2 Short Detect Events

0 No reaction

1 MIC2 fed Input Path(s) is (are) automatically muted

1 2 ... 81 82 83 84 85 86 87 88 89 90 91 ... 138 139

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