NJU26209
- 8 -
Ver.2008-12-04
Pin setting
The NJU26209 operates default command setting after resetting the NJU26209. In addition, the NJU26209
restricts operation at power on by setting PROC pin and MUTEb pin. These pins are input pin. However, these pins
operate as bi-directional pins. Connect with V
DDIO
or V
SSIO
through 3.3k
Ω
resistance.
Table 7 Pin setting
Pin No.
Symbol
Setting
Function
“High”
The NJU26209 operates default setting after reset.
13 PROC
“Low”
The NJU26209 does not operate after reset. Sending start
command is required for starting operation.
“High”
Master volume is set 0dB after reset.
11 MUTEb
“Low”
Master volume is set mute after reset.
WatchDog Clock
The NJU26209 outputs clock pulse through WDC (Pin No.12) during normal operation. The WDC clock is useful
to check the status of the NJU26209 operation. For example, a microcomputer monitors the WDC clock and checks
the status of the NJU26209. When the WDC clock pulse is lost or not normal clock cycle, the NJU26209 does not
operate correctly. Then reset the NJU26209 and set up the NJU26209 again. The WDC clock is able to be variable
for 0msec to 100msec by command. Default setting of WDC clock is 100msec.
The WDC pin is open drain output. The WDC pin setting (Table 8)
Table 8 WDC pin setting
Note:
The cycle of WDC output is rough. Because WDC output inserts in the process of sound processing.
In slave mode, when there is no input of BCKI/LRI, WDC can’t output.
It is required to set up a sampling rate correctly.
Pin No. Symbol
Setting
WDC pin is used.
Connect with V
DDIO
through 3.3k
Ω
resistance.
12 WDC
WDC pin is not used.
Connect with V
SSIO
through 3.3k
Ω
resistance.
Do not open WDC pin.
