Production Data
WM8750L
POWER MANAGEMENT
The WM8750L has two control registers that allow users to select which functions are active. For
minimum power consumption, unused functions should be disabled. To avoid any pop or click noise,
it is important to enable or disable functions in the correct order (see Applications Information).
VMIDSEL is the enable for the Vmid reference, which defaults to disabled and can be enabled as a
50k potential divider or, for low power maintenance of Vref when all other blocks are disabled, as a
500k potential divider.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R25 (19h)
VMIDSEL
Vmid divider enable and select
8:7
00
Power
00 – Vmid disabled (for OFF mode)
Management
(1)
01 – 50k divider enabled (for
playback/record)
10 – 500k divider enabled (for low-power
standby)
11 – 5k divider enabled (for fast start-up)
VREF (necessary for all other functions)
0 = Power down
1 = Power up
VREF
AINL
6
5
4
3
2
1
8
7
6
5
4
3
2
0
0
0
0
0
0
0
0
0
0
0
0
0
Analogue in PGA Left
0 = Power down
1 = Power up
AINR
Analogue in PGA Right
0 = Power down
1 = Power up
ADCL
ADCR
MICB
ADC Left
0 = Power down
1 = Power up
ADC Right
0 = Power down
1 = Power up
MICBIAS
0 = Power down
1 = Power up
R26 (1Ah)
DACL
DACR
LOUT1
ROUT1
LOUT2
ROUT2
MONO
DAC Left
Power
Management
(2)
0 = Power down
1 = Power up
DAC Right
0 = Power down
1 = Power up
LOUT1 Output Buffer*
0 = Power down
1 = Power up
ROUT1 Output Buffer*
0 = Power down
1 = Power up
LOUT2 Output Buffer*
0 = Power down
1 = Power up
ROUT2 Output Buffer*
0 = Power down
1 = Power up
MONOOUT Output Buffer and Mono Mixer
0 = Power down
1 = Power up
PD, Rev 4.4, August 2012
51
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
