WM8804 datasheet(18/66 Pages) WOLFSON

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WM8804

Production Data

PD Rev 4.1 September 2007

SOFTWARE REGISTER RESET

Writing to register 0000000 will reset the WM8804. This will reset all register bits to their default

values. The WM8804 is powered down by default so writing to this register will power down the

device.

DEVICE ID AND REVISION IDENTIFICATION

Registers 0,1 and 2 can be read to identify the device ID and IC revision number. Refer to Table 12

for details.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

RESET

N/A

Writing to this register will apply a

reset to the device.

R00

RST/DEVID1

00h

7:0

DEVID1[7:0]

00000101

Reading from this register will return

the second part of the device ID

00000101 = 0x05

R01

DEVID2

01h

(read only)

7:0

DEVID2[7:0]

10001000

Reading from this register will return

the first part of the device ID

10001000 = 0x88

R02

DEVREV

02h

3:0

DEVREV

[3:0]

N/A

Reading from this register will return

the device revision.

0x1 = revision 1

Table 12 Software Reset Register and Device ID

HARDWARE CONTROL MODE

The WM8804 can be operated in either software or hardware control modes. The method of control

is determined by sampling the state of the SDIN pin during power up or hard reset. If SDIN is LOW

during power up or hardware reset, the WM8804 will be switched into hardware control mode.

SDIN

Hardware control Mode

Software control Mode

Table 13 Hardware / Software Mode Configuration

In hardware control mode the user has limited control over the configuration of the device. Most of

the features will assume default values but some can be configured using external pins. When the

device is configured in hardware control mode, all functions of the device are powered up.

The clock and data recovery module requires a 12 MHz crystal derived clock reference as the

default values for this module cannot be altered in hardware control mode.

MASTER / SLAVE MODE SELECTION

The WM8804 can be configured in either master or slave mode. In software control mode this is set

by writing to AIF_MS in the AIFRX register. In hardware control mode this is controlled by sampling

the SCLK pin on power up or hardware reset.

(HARDWARE

MODE)

(SOFTWARE

MODE)

SCLK

AIF_MS

Slave mode

Master mode

Table 14 Master / Slave Mode Configuration in Hardware Mode

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