WM8959 Wolfson Microelectronics Ltd., WM8959 Datasheet - Page 116

• Manufacturer Part Number: WM8959
• Description: Mobile Multimedia DAC with Dual-mode Class AB/D Speaker Driver
• Manufacturer: Wolfson Microelectronics Ltd.

WM8959
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POWER MANAGEMENT
POWER MANAGEMENT REGISTERS
The WM8959 has three control registers that allow users to select which functions are active. For
minimum power consumption, unused functions should be disabled. To minimise pop or click noise,
it is important to enable or disable functions in the correct order. See “Pop Suppression Control” for
further details of recommended control sequences.
REGISTER
ADDRESS
R1 (1h)
R2 (02h)
12
11
10
9
8
4
2:1
0
15
14
13
11
9
BIT
SPK_ENA
(rw)
OUT3_ENA
(rw)
OUT4_ENA
(rw)
LOUT_ENA
(rw)
ROUT_ENA
(rw)
MICBIAS_ENA
(rw)
VMID_MODE
[1:0]
(rw)
VREF_ENA
(rw)
PLL_ENA
(rw)
TSHUT_ENA
(rw)
TSHUT_OPDIS
(rw)
OPCLK_ENA
(rw)
AINL_ENA
(rw)
LABEL
DEFAULT
0b
0b
0b
0b
0b
0b
00b
0b
0b
0b
1b
0b
0b
SPKMIX Mixer, Speaker PGA and Speaker
Output Enable
0 = disabled
1 = enabled
OUT3 and OUT3MIX Enable
0 = disabled
1 = enabled
OUT4 and OUT4MIX Enable
0 = disabled
1 = enabled
LOUT (Left Headphone Output) Enable
0 = disabled
1 = enabled
ROUT (Right Headphone Output) Enable
0 = disabled
1 = enabled
MICBIAS Enable
0 = OFF (high impedance output)
1 = ON
Vmid Divider Enable and Select
00 = Vmid disabled (for OFF mode)
01 = 2 x 50kΩ divider (Normal mode)
10 = 2 x 250kΩ divider (Standby mode)
11 = 2 x 5kΩ divider (for fast start-up)
VREF Enable (Bias for all analogue
functions)
0 = VREF bias disabled
1 = VREF bias enabled
PLL Enable
0 = disabled
1 = enabled
Thermal Sensor Enable
0 = Thermal sensor disabled
1 = Thermal sensor enabled
Thermal Shutdown Enable
(Requires thermal sensor to be enabled)
0 = Thermal shutdown disabled
1 = Thermal shutdown enabled
GPIO Clock Output Enable
0 = disabled
1 = enabled
Left Input Path Enable
(Enables AINLMUX, INMIXL, DIFFINL and
RXVOICE input to AINLMUX)
0 = disabled
1 = enabled
DESCRIPTION
PP, May 2008, Rev 3.1
Pre-Production
116