WM8985_07 WOLFSON [Wolfson Microelectronics plc], WM8985_07 Datasheet - Page 88

• Manufacturer Part Number: WM8985_07
• Description: Multimedia CODEC With Class D Headphone and Line Out
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM8985
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VMID
Table 51 VMID Impedance Control
BIASEN
Table 52 Analogue Bias Control
The analogue circuitry will not operate unless VMID is enabled. The impedance of the VMID resistor
string, together with the decoupling capacitor on the VMID pin will determine the start-up time of the
VMID circuit.
The analogue amplifiers will not operate unless BIASEN is enabled.
R1 (01h)
Power
management 1
R1 (01h)
Power
management 1
REGISTER
REGISTER
ADDRESS
ADDRESS
1:0
3
BIT
BIT
VMIDSEL
BIASEN
LABEL
LABEL
0
DEFAULT
00
DEFAULT
Analogue amplifier bias control
0 = disabled
1 = enabled
Reference string impedance to VMID pin
00 = off (250k Ω VMID to AGND1)
01=75k Ω
10=300k Ω
11=5k Ω
DESCRIPTION
DESCRIPTION
PP, Rev 3.5, March 2007
Pre-Production
88