wm8918 Wolfson Microelectronics plc, wm8918 Datasheet - Page 132

• Manufacturer Part Number: wm8918
• Description: Ultra Low Power Dac For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

WM8918
REGISTER BITS BY ADDRESS
Register 00h SW Reset and ID
Register 04h Bias Control 0
Register 05h VMID Control 0
R6 (06h) Mic
w
Bias Control
Bias Control
REGISTER
REGISTER
REGISTER
REGISTER
ADDRESS
ADDRESS
ADDRESS
ADDRESS
SW Reset
Control 0
R0 (00h)
R4 (04h)
R5 (05h)
and ID
VMID
0
0
15:0
BIT
BIT
BIT
BIT
2:1
6:4
3:2
0
6
0
VMID_BUF_EN
SW_RST_DEV
VMID_RES[1:0
MICDET_THR[
MICSHORT_T
VMID_ENA
BIAS_ENA
_ID1[15:0]
LABEL
LABEL
LABEL
LABEL
HR[1:0]
2:0]
A
]
1000_1001
_0000_010
DEFAULT
DEFAULT
DEFAULT
DEFAULT
000
00
00
0
0
0
0
Writing to this register resets all registers to their
default state.
Reading from this register will indicate Device ID
8904h.
Enables the Normal bias current generator (for all
analogue functions)
0 = Disabled
1 = Enabled
Enable VMID buffer to unused Inputs/Outputs
0 = Disabled
1 = Enabled
VMID Divider Enable and Select
00 = VMID disabled (for OFF mode)
01 = 2 x 50k divider (for normal operation)
10 = 2 x 250k divider (for low power standby)
11 = 2 x 5k divider (for fast start-up)
Enable VMID master bias current source
0 = Disabled
1 = Enabled
MICBIAS Current Detect Threshold (AVDD = 1.8V)
000 = 0.070mA
001 = 0.260mA
010 = 0.450mA
011 = 0.640mA
100 = 0.830mA
101 = 1.020mA
110 = 1.210mA
111 = 1.400mA
Values scale with AVDD.
MICBIAS Short Circuit Threshold (AVDD = 1.8V)
00 = 0.520mA
01 = 0.880mA
10 = 1.240mA
11 = 1.600mA
Values scale with AVDD.
DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION
PD, Rev 4.0, September 2010
REFER TO
REFER TO
REFER TO
REFER TO
Production Data
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