HA16129FPJ Datasheet, PDF (16/23 Pages) Hitachi Semiconductor – Single Watchdog Timer

HA16129FPJ
System Circuit Examples
• Example of a basic system
1 P-RUN
180k
2 Rf
3300p
0.1µ
1500p
3 Cf
180k
4 R_R
5 C_R
390k ^{6 RT}
7 C_RES
8 GND
9 Voadj
10 OUTE
PORT
STBY 20
STBY
STBYadj 19
RES 18
RES
NMI 17
NMI
NMIadj 16
V_CC
PORT
NMIsns 15
V_OUT 14
CONT 13
+_200µ
(5 V)
To other power supplies
CS 12
V_CC 11
IGN
0.2 SW.
+
DS
BATTERY
• Example of a system using a backup circuit and a primary voltage monitoring circuit
1 P-RUN
180k
2 Rf
3300p
0.1µ
1500p
3 Cf
180k
4 R_R
5 C_R
390k ^{6 RT}
7 C_RES
8 GND
9 Voadj
10 OUTE
STBY 20
STBYadj 19
RES 18
NMI 17
NMIadj 16
NMIsns 15
V_OUT 14
CONT 13
CS 12
V_CC 11
R2
+
200µ
R1
0.2
PORT
STBY
RES
NMI
V_CC PORT
To other power supplies
Q1
(5V)
R4
D1
R3
Q2
Primary detection
D_S
IGN _R5
SW.
+ _BATTERY
D_Z
Backup circuit
D_S: Schottky diode
D_Z: Zener diode
Rev.3.00 Jun 15, 2005 page 16 of 22