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WM8351 Datasheet(PDF) 67 Page - Wolfson Microelectronics plc

Part # WM8351
Description  Wolfson AudioPlus??Stereo CODEC with Power Management
PDF  330 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8351 Datasheet(HTML) 67 Page - Wolfson Microelectronics plc

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Production Data
WM8351
w
PD, April 2012, Rev 4.5
67
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)
Power Mgmt 1
4
MICB_ENA
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.
R74 (4Ah)
Mic Bias
Control
15
MICB_ENA
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



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