WM8731 Wolfson Microelectronics Ltd., WM8731 Datasheet - Page 43

• Manufacturer Part Number: WM8731
• Description: WM8731 : Low Power Audio Codec With Integrated Headphone Driver
• Manufacturer: Wolfson Microelectronics Ltd.

WM8731
3-WIRE (SPI COMPATIBLE) SERIAL CONTROL MODE
The WM8731 can be controlled using a 3-wire serial interface. SDIN is used for the program data,
SCLK is used to clock in the program data and CSB is use to latch in the program data. The 3-wire
interface protocol is shown in Figure 31.
Figure 31 3-Wire Serial Interface
Notes:
1.
2.
3.
2-WIRE SERIAL CONTROL MODE
The WM8731 supports a 2-wire MPU serial interface. The device operates as a slave device only.
The WM8731 has one of two slave addresses that are selected by setting the state of pin 15, (CSB).
Figure 32 2-Wire Serial Interface
Notes:
Table 24 2-Wire MPU Interface Address Selection
1.
2.
SCLK
SDIN
B[15:9] are Control Address Bits
B[8:0] are Control Data Bits
CSB is edge sensitive not level sensitive. The data is latched on the rising edge of CSB.
B[15:9] are Control Address Bits
B[8:0] are Control Data Bits
SCLK
SDIN
CSB
START
CSB STATE
0
1
B15
R ADDR
B14
B13
B12
R/W
B11
ACK
B10
ADDRESS
0011010
0011011
B9
DATA B15-8
B8
B7
B6
ACK
B5
B4
DATA B7-0
B3
AI Rev 2.3 August 2001
B2
Advanced Information
B1
ACK
B0
STOP
43