WM8802
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DEVICE DESCRIPTION
INITIAL SYSTEM SETTINGS
SYSTEM RESET (XMODE)
The system operates normally when XMODE is set to High after applying a supply voltage of 3.0V or
greater. Following power ON, the system is reset by setting XMODE to Low again.
A 10kΩ pull-down or pull-up resistor can be used to set EMPHA/UO, AUDIO /VO, CKST and
INT for the following:
•
•
•
chip address
demodulation function master or slave
modulation function or general-purpose I/O function settings
If EMPHA/UO, AUDIO /VO, CKST , and INT are not pulled up or down, their state is undefined. A
pull-up or pull-down resistor should always be connected to these pins.
SETTING
PINS
Chip address
EMPHA/UO, AUDIO /VO
CKST
Demodulation function master or slave
Modulation function or general-
purpose I/O function
INT
Table 1 Pin Names and Settings
Normal system operation range
Setting completed
3.3V
3.0V
DVDD
XMODE
Setting input
state
Setting input
Undefined
Output state
Output state
Set pin state
state
Min 200 µs
Figure 3 Setting Timing Chart of Function Setting Input Pins
PP Rev 1.1 April 2004
10
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
