WM8523GEFLSLASHV datasheet(17/51 Pages) WOLFSON

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Production Data

WM8523

PD, Rev 4.1, August 2011

DEVICE DESCRIPTION

INTRODUCTION

The WM8523 provides high fidelity, 2Vrms ground referenced stereo line output from a single supply line

with minimal external components. The integrated DC servo eliminates the requirement for external

mute circuitry by minimising DC transients at the output during power up/down. The device is well-suited

to both stereo and multi-channel systems.

The device supports all common audio sampling rates between 8kHz and 192kHz using common MCLK

fs rates. Master and slave modes are available.

The WM8523 supports both hardware and software control modes.

In hardware control mode, the digital audio interface format is switchable between 16 to 24bits LJ, RJ

and I2S. Mute and de-emphasis control pins are also available.

In software control modes the digital audio interface is highly programmable, with four control interface

addresses to allow multiple WM8523 devices to be configured independently.

SOFTWARE CONTROL INTERFACE

Software Control Mode is selected by logic 1 or 0 on the CIFMODE pin. The logic level is referenced to

the LINEVDD power domain. When software mode is selected, the associated multi-function control

pins are defined as described in Table 6.

PIN NAME

PIN NUMBER

DESCRIPTION

TSSOP

QFN

SDOUT

I2C Mode - Device Address[1]

SPI Mode - Serial Data Output

SDA

Serial Data Input

SCLK

Serial Data Clock

¯ ¯

I2C Mode - Device Address[0]

SPI Mode - Chip Select

CIFMODE

Control Interface Mode

0 = I2C Mode

1 = SPI Mode

Z = Hardware Mode

Table 6 Software Control Pin Configuration

In software control mode, the WM8523 is controlled by writing to its control registers. Readback is

available for all registers, including device ID and power management status bits. The control interface

can operate as an I

2C or SPI control interface: register read-back is provided on the bi-directional pin

SDA in I2C mode, and on the SDOUT pin in SPI mode. The WM8523 software control interface is

supplied by the LINEVDD power domain.

The available software control interface modes are summarised as follows:



I2C mode uses pins SCLK and SDA.



SPI mode uses pins CS

¯ ¯ , SCLK and SDA and SDOUT.

I2C mode is selected by setting the CIFMODE pin to logic 0. When CIFMODE is set to logic 1, SPI mode

is selected.

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