WM8522 Wolfson Microelectronics plc, WM8522 Datasheet - Page 19

• Manufacturer Part Number: WM8522
• Description: 24-bit, 192khz 6-channel Dac With 1.7vrms Line Driver
• Manufacturer: Wolfson Microelectronics plc

Production Data
SOFTWARE CONTROL INTERFACE OPERATION
CONTROL INTERFACE REGISTERS
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The WM8522 is controlled using a 3-wire serial interface in software mode or pin programmable in
hardware mode.
The control mode is selected by the state of the MODE pin.
3-WIRE (SPI COMPATIBLE) SERIAL CONTROL MODE
SDIN/DM is used for the program data, SCLK/IWL is used to clock in the program data and CSB/I2S
is used to latch the program data. SDIN/DM is sampled on the rising edge of SCLK/IWL. The 3-wire
interface protocol is shown in Figure 18.
Figure 18 3-Wire SPI Compatible Interface
ATTENUATOR CONTROL MODE
Setting the ATC register bit causes the left channel attenuation settings to be applied to both left and
right channel DACs from the next audio input sample. No update to the attenuation registers is
required for ATC to take effect.
1.
2.
3.
REGISTER ADDRESS
DAC Channel Control
B[15:9] are Control Address Bits
B[8:0] are Control Data Bits
CSB/I2S is edge sensitive – the data is latched on the rising edge of CSB/I2S.
0000010
BIT
3
LABEL
ATC
DEFAULT
0
Attenuator Control Mode:
0: Right channels use right
1: Right channels use left
attenuations
attenuations
DESCRIPTION
PD, Rev 4.1, July 2009
WM8522
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