WM8351 Datasheet, PDF (67/330 Pages) Wolfson Microelectronics plc – Wolfson AudioPlus™ Stereo CODEC with Power Management

Production Data
WM8351
13.4.5 MICROPHONE BIASING
The WM8351 provides a programmable, low-noise bias voltage for condenser electret microphones
on the MICBIAS pin.
ADDRESS BIT
LABEL
DEFAULT
DESCRIPTION
R8 (08h)
4 MICB_ENA
0
Microphone bias enable
Power Mgmt 1
0 = OFF (high impedance output)
R74 (4Ah)
Mic Bias
Control
15 MICB_ENA
1 = ON
This bit can be accessed through R8 or
through R74. Reading from or writing to
either register location has the same effect.
14 MICB_SEL
0
Microphone bias voltage control:
0 = 0.9 * AVDD
1 = 0.75 * AVDD
Note: MICB_ENA can be accessed through R8 or through R74. Reading from or writing to either
register location has the same effect.
Table 23 Controlling the Microphone Bias Voltage
w
PD, April 2012, Rev 4.5
67