WM8802SCFV datasheet(12/65 Pages) WOLFSON

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WM8802

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PP Rev 1.1 April 2004

DEMODULATION FUNCTION MASTER/SLAVE SETTINGS ( CKST )

A master/slave function allows multi-channel synchronized transfer using multiple WM8802 devices.

A 10k

Ω pull-down or a pull-up resistor should be connected to CKST to set this function.

Set the master mode when using only one WM8802. When using multiple WM8802 devices, set one

to the master mode and the others to slave mode.

In order to perform multi-channel transfer when using multiple WM8802 devices, RBCK and RLRCK

(output) should be connected as the master and RLRCK (input) as the slave. XMCK of the master

device should be connected to XIN of the slave device. The same polarity should be set for RBCK

and RLRCK and the same frequency for XIN and XMCK.

Some of the output data maybe dropped or read twice on the slave side if the input data sampling

frequency or the phase between the master and slave differ. This can also be true if the clock

sources differ even though the sampling frequencies are the same. This phenomenon can be

checked using the INT pin and the micro-controller interface.

CKST

MODE

Pull-down

Master mode

Pull-up

Slave mode

Table 3 Master/Slave Switching

MASTER MODE

SLAVE MODE

RMCK

Output

Low

RBCK

Output

Input

RLRCK

Output

Input

Table 4 Clock Pin State

MODULATION FUNCTION AND GENERAL-PURPOSE I/O PORT SWITCHING ( INT )

The modulation function and the general-purpose I/O function share the same pin and therefore

cannot be used simultaneously.

A 10k

Ω pull-down or pull-up resistor can be connected to INT to select the function listed in Table

INT STATE

FUNCTION

pull-down

Modulation f unction

Pull-up

General-purpose I/O

Table 5 Modulation Function and General-Purpose I/O Switching

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