Cirrus Logic CS42L73 - Manual (Page 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
L
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.
7 6 5 4 3 2 1 0
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
L
Range
0 Disabled Heavy R
L
 R
L(max)
with SPK_LITE_LOAD = 0 b
1 Enabled Light R
L
 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 .
1
SDET_AMUTE Reaction To MIC2 Short Detect Events
0 No reaction
1 MIC2 fed Input Path(s) is (are) automatically muted