wm8802scft/v Wolfgang Knap, wm8802scft/v Datasheet - Page 12

• Manufacturer Part Number: wm8802scft/v
• Description: Digital Audio Interface Transceiver
• Manufacturer: Wolfgang Knap

WM8802
DEMODULATION FUNCTION MASTER/SLAVE SETTINGS ( CKST )
MODULATION FUNCTION AND GENERAL-PURPOSE I/O PORT SWITCHING ( INT )
w
Table 3 Master/Slave Switching
Table 4 Clock Pin State
The modulation function and the general-purpose I/O function share the same pin and therefore
cannot be used simultaneously.
Table 5 Modulation Function and General-Purpose I/O Switching
A master/slave function allows multi-channel synchronized transfer using multiple WM8802 devices.
A 10k
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.
A 10k
5.
RLRCK
RMCK
RBCK
PIN
INT STATE
Pull-down
pull-down
pull-down or a pull-up resistor should be connected to CKST to set this function.
pull-down or pull-up resistor can be connected to INT
Pull-up
Pull-up
CKST
MASTER MODE
Output
Output
Output
General-purpose I/O
Modulation f unction
Master mode
Slave mode
FUNCTION
MODE
SLAVE MODE
Input
Input
Low
to
select the function listed in Table
PP Rev 1.1 April 2004
Product Preview
12