WM8956 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'WM8956' PDF : 80 Pages View PDF
WM8956
Production Data
To avoid clipping at speaker supply, SPKVDD1 and SPKVDD2 must be high enough to support the
peak output voltage when using DCGAIN and ACGAIN functions. The peak output voltage is
AVDD*(DCGAIN+ACGAIN)/2.
DCGAIN should normally be set to the same value as ACGAIN.
See "Volume Updates" for more information on volume update bits, zero cross and timeout operation.
See "Class D Speaker Outputs" for more information on class D speaker operation.
OUT3 OUTPUT
The OUT3 pin can drive a 16 or 32 headphone or a line output or be used as a pseudo-ground for
capless headphone drive (see Headphone Output section). It can also drive out a mono mix of left
and right output mixers (See Output Signal Path).
ENABLING THE OUTPUTS
Each analogue output of the WM8956 can be independently enabled or disabled. The analogue mixer
associated with each output is powered on or off along with the output pin. All outputs are disabled by
default. To save power, unused outputs should remain disabled.
REGISTER
ADDRESS
R26 (1Ah)
Power
Management
(2)
BIT
LABEL
6
LOUT1
5
ROUT1
4
SPKL
3
SPKR
DEFAULT
0
0
0
0
R49 (31h)
Class D
Control (1)
1
OUT3
0
7:6 SPK_OP_EN 00
[1:0]
Note: All “Enable” bits are 1 = ON, 0 = OFF
DESCRIPTION
LOUT1 Output Enable
ROUT1 Output Enable
SPK_LP and SPK_LN Volume Control
Enable
SPK_RP and SPK_RN Volume Control
Enable
OUT3 Enable
Enable Class D Speaker Outputs
00 = Off
01 = Left speaker only
10 = Right speaker only
11 = Left and right speakers enabled
Table 20 Analogue Output Control
w
PD, November 2011, Rev 4.1
34
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