WM8994 Datasheet, PDF (272/359 Pages) Wolfson Microelectronics plc – Multi-Channel Audio Hub CODEC for Smartphones

WM8994
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
1 = Enabled (provided VMID_SEL > 00)
2 STARTUP_BIA
0
Enables the Start-Up bias current generator
S_ENA
0 = Disabled
1 = Enabled
1
BIAS_SRC
0
Selects the bias current source
0 = Normal bias
1 = Start-Up bias
0
VMID_DISCH
0
Connects VMID to ground
0 = Disabled
1 = Enabled
Register 39h AntiPOP (2)
Production Data
REFER TO
REGISTER BIT
LABEL
DEFAULT
DESCRIPTION
ADDRESS
R58 (3Ah)
MICBIAS
7:6 MICD_SCTHR
[1:0]
00
MICBIAS Short Circuit Current threshold
00 = 300uA
01 = 600uA
10 = 1200uA
11 = 2400uA
These values are for AVDD1=3.0V and scale
proportionally with AVDD1.
5:3
MICD_THR
[2:0]
000 MICBIAS Current Detect threshold
00X = 150uA
01X = 300uA
10X = 600uA
11X = 1200uA
These values are for AVDD1=3.0V and scale
proportionally with AVDD1.
2
MICD_ENA
0
MICBIAS Current Detect / Short Circuit Threshold
enable
0 = Disabled
1 = Enabled
1
MICB2_LVL
0
Microphone Bias 2 Voltage Control
0 = 0.9 * AVDD1
1 = 0.65 * AVDD1
0
MICB1_LVL
0
Microphone Bias 1 Voltage Control
0 = 0.9 * AVDD1
1 = 0.65 * AVDD1
Register 3Ah MICBIAS
REFER TO
REGISTER BIT
ADDRESS
R59 (3Bh) 3:1
LDO 1
LABEL
DEFAULT
DESCRIPTION
LDO1_VSEL
[2:0]
110 LDO1 Output Voltage Select
2.4V to 3.1V in 100mV steps
000 = 2.4V
001 = 2.5V
010 = 2.6V
011 = 2.7V
100 = 2.8V
101 = 2.9V
110 = 3.0V
w
REFER TO
PD, April 2012, Rev 4.4
272