wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 251

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

Production Data
Register 4Ah Mic Bias Control
w
REGISTER
ADDRESS
R74 (4Ah)
Mic Bias
Control
BIT
4:2
1:0
15
14
7
MCDSCTHR[1:0]
MIC_DET_ENA
MCDTHR[2:0]
MICB_ENA
MICB_SEL
LABEL
DEFAULT
000
00
0
0
0
Microphone bias enable
0 = OFF (high impedance output)
1 = ON
Microphone bias voltage control:
0 = 0.9 * AVDD
1 = 0.75 * AVDD
Enable MIC detect:
0 = Disabled
1 = Enabled
Threshold for bias current detection
000 = 160μA
001 = 330μA
010 = 500μA
011 = 680μA
100 = 850μA
101 = 1000μA
110 = 1200μA
111 = 1400μA
These threshold currents scale proportionally with
AVDD. The values given are for AVDD=3.3V.
Threshold for microphone short-circuit detection
00 = 400μA
01 = 900μA
10 = 1350μA
11 = 1800μA
These threshold currents scale proportionally with
AVDD. The values given are for AVDD=3.3V.
DESCRIPTION
PD, June 2009, Rev 4.1
REFER TO
WM8351
251