WM1811A Datasheet, PDF (41/328 Pages) Wolfson Microelectronics plc – Multi-Channel Audio Hub CODEC for Smartphones

Production Data
WM1811A
MICBIAS2 (eg. for a digital microphone supply), then the respective MICBIAS generator must be
configured in Bypass mode.
The MICBIAS configuration is illustrated in Figure 10.
Figure 10 MICBIAS Generator
REGISTER
ADDRESS
R1
(0001h)
Power
Managem
ent (1)
BIT
LABEL
5 MICB2_ENA
4 MICB1_ENA
R61
(003Dh)
MICBIAS
1
5 MICB1_RATE
4 MICB1_MODE
3:1 MICB1_LVL [2:0]
0 MICB1_DISCH
R62
(003Eh)
MICBIAS
w
5 MICB2_RATE
DEFAULT
DESCRIPTION
0
Microphone Bias 2 Enable
0 = Disabled
1 = Enabled
0
Microphone Bias 1 Enable
0 = Disabled
1 = Enabled
1
Microphone Bias 1 Rate
0 = Fast start-up / shut-down
1 = Pop-free start-up / shut-down
1
Microphone Bias 1 Mode
0 = Regulator mode
1 = Bypass mode
100
Microphone Bias 1 Voltage Control
(when MICB1_MODE = 0)
000 = 1.5V
001 = 1.8V
010 = 1.9V
011 = 2.0V
100 = 2.2V
101 = 2.4V
110 = 2.5V
111 = 2.6V
1
Microphone Bias 1 Discharge
0 = MICBIAS1 floating when disabled
1 = MICBIAS1 discharged when disabled
1
Microphone Bias 2 Rate
0 = Fast start-up / shut-down
1 = Pop-free start-up / shut-down
PD, November 2013, Rev 4.1
41