Production Data
WM8737L
Figure 15 DSP Mode A Slave Mode
Figure 16 DSP Mode B Slave Mode
AUDIO INTERFACE CONTROL
The register bits controlling audio format, word length and master/slave mode are summarised below.
Note that dynamically changing the software format may cause erroneous operation of the interfaces
and is therefore not recommended.
All ADC data is signed 2’s complement. The length of the digital audio data is programmable at
16/20/24 or 32 bits, as shown below. The ADC digital filters process data using 24 bits. If the
WM8737L is programmed to output 16 or 20 bit data then it strips the LSBs from the 24 bit data. If the
device is programmed to output 32 bits then it packs the LSBs with zeros.
REGISTER
ADDRESS
BIT
LABEL
FORMAT
DEFAULT
10
DESCRIPTION
R7 (07h)
1:0
Audio Data Format Select
11: DSP Mode
10: I2S Format
Digital Audio
Interface
Format
01: Left justified
00: Right justified
Audio Data Word Length
11: 32 bits (see Note)
10: 24 bits
3:2
WL
10
01: 20 bits
00: 16 bits
PD, Rev 4.4, January 2012
27
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
