HA16117F Series
Pin Arrangement
VCC 1
P-RUN 2
CF 3
CR 4
8 Tadj
7 ACC
6 GND
5 RES
(Top view)
Pin Description
Pin No.
Symbol
Function
1
VCC
Power supply voltage input
2
P-RUN
Watchdog timer (WDT) input
3
CF
Connected capacitor CF determines WDT filter characteristic
(normal frequency range)
4
CR
Connected capacitor CR determines tON for power-on reset and tOFF, tRH,
and tRL for auto-reset
5
RES
Reset signal output from WDT and voltage supervision circuits
6
GND
Ground
7
ACC
WDT on/off control input (on when ACC is low)
8
Tadj *
For adjusting tRH and tOFF (divide VCC to get the adjustment voltage)
Note: The low-voltage threshold cannot be modified by changing the external resistors connected to the Tadj pin.
Rev.3.00 Jun 15, 2005 page 2 of 30