WM8533 datasheet(15/41 Pages) WOLFSON

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Production Data

WM8533

PD, July 2012, Rev 4.0

DEVICE DESCRIPTION

INTRODUCTION

The WM8533 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 ratios. Master and slave modes are available.

The WM8533 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 I

2S, and a mute control pin is also available.

In software control modes, the digital audio interface is fully programmable, with two control interface

addresses to allow multiple WM8533 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 DBVDD power domain. When software mode is selected, the associated multi-function control

pins are defined as described in Table 6.

PIN NAME

REF

DESCRIPTION

SDA

Serial Data Input

SCLK

Serial Data Clock

¯¯

2C Mode - Device Address

SPI Mode - Chip Select

CIFMODE

Control Interface Mode

0 = I

2C Mode

1 = SPI Mode

Z = Hardware Mode

Table 6 Software Control Pin Configuration

In software control mode, the WM8533 is controlled by writing to its control registers. Readback is

available for all registers, including device ID and power management status bits, in I

2C control mode

only. 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 I

2C mode. Note that Readback is not available in SPI mode.

The WM8533 software control interface is supplied by the DBVDD power domain.

The available software control interface modes are summarised as follows:



2C mode uses pins SCLK and SDA.



SPI mode uses pins CS

¯¯ , SCLK and SDA.

2C mode is selected by setting the CIFMODE pin to logic 0.

SPI mode is selected by setting the CIFMODE pin to logic 1.

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