WM8955BL Wolfson Microelectronics, WM8955BL Datasheet - Page 35

• Manufacturer Part Number: WM8955BL
• Description: Stereo DAC
• Manufacturer: Wolfson Microelectronics

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Production Data
POWER MANAGEMENT
The WM8955BL 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)
Table 26 Power Management
R25 (19h)
Power
Manageme
nt (1)
R26 (1Ah)
Power
Manageme
nt (2)
Note:
* The left mixer is enabled when LOUT1=1 or LOUT2=1. The right mixer is enabled when
ROUT1=1 or ROUT2=1.
REGISTER
ADDRESS
8:7
6
8
7
6
5
4
3
2
1
BIT
VMIDSEL
VREF
DACL
DACR
LOUT1
ROUT1
LOUT2
ROUT2
MOUT
OUT3
LABEL
00
0
0
0
0
0
0
0
0
0
DEFAULT
VMID resistor divider select
00 – VMID disabled
01 – 50kΩ divider enabled
10 – 500kΩ divider enabled
11 – 5kΩ divider enabled (for fast start-up)
VREF (necessary for all other functions)
DAC Left Enable
0=off
1=on
DAC Right Enable
0=off
1=on
LOUT1 Output Buffer* Enable
0=off
1=on
ROUT1 Output Buffer* Enable
0=off
1=on
LOUT2 Output Buffer* Enable
0=off
1=on
ROUT2 Output Buffer* Enable
0=off
1=on
MONOOUT Output Buffer and Mono Mixer
Enable
0=off
1=on
OUT3 Output Buffer Enable
0=off
1=on
DESCRIPTION
PD Rev 4.1 February 2007
WM8955BL
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