WM8522 datasheet(19/39 Pages) WOLFSON

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Pre-Production

WM8522

PP Rev 3.1 May 2006

SOFTWARE CONTROL INTERFACE OPERATION

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

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.

CONTROL INTERFACE REGISTERS

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.

BIT

LABEL

DEFAULT

DESCRIPTION

0000010

DAC Channel Control

ATC

Attenuator Control Mode:

0: Right channels use right

attenuations

1: Right channels use left

attenuations

WM8522 Datasheet(PDF) 19 Page - Wolfson Microelectronics plc