wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 67

• Manufacturer Part Number: wm8351
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

Production Data
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13.4.5
The WM8351 provides a programmable, low-noise bias voltage for condenser electret microphones
on the MICBIAS pin.
R8 (08h)
Power Mgmt 1
R74 (4Ah)
Mic Bias
Control
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
ADDRESS
MICROPHONE BIASING
BIT
15
14
4
MICB_ENA
MICB_ENA
MICB_SEL
LABEL
DEFAULT
0
0
Microphone bias enable
0 = OFF (high impedance output)
1 = ON
This bit can be accessed through R8 or
through R74. Reading from or writing to
either register location has the same effect.
Microphone bias voltage control:
0 = 0.9 * AVDD
1 = 0.75 * AVDD
DESCRIPTION
PD, June 2009, Rev 4.1
WM8351
67