WM8775 Datasheet, PDF (20/39 Pages) Wolfson Microelectronics plc – 24 BIT 96 KHZ ADC WITH 4 CHANNEL I/P MULTIPLEXER

WM8775
Production Data
Figure 19 DSP/PCM Mode Audio Interface (mode B, LRP=0, Slave)
CONTROL INTERFACE OPERATION
The WM8775 is controlled using a 3-wire serial interface in a SPI compatible configuration or
a 2-wire serial interface mode. The interface type is selected by the MODE pin as shown in
Table 9.
MODE
Control Mode
0
2 wire interface
1
3 wire interface
Table 9 Control Interface Selection via MODE pin
3-WIRE (SPI COMPATIBLE) SERIAL CONTROL MODE
DI is used for the program data, CL is used to clock in the program data and CE is used to latch the
program data. DI is sampled on the rising edge of CL. The 3-wire interface protocol is shown in
Figure 20.
CE
CL
DI
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
Figure 20 3-Wire SPI Compatible Interface
1. B[15:9] are Control Address Bits
2. B[8:0] are Control Data Bits
3. CE is edge sensitive – the data is latched on the rising edge of CE.
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PD, Rev 4.4, October 2008
20