HA16103 : Watchdog Timer

http://www.digchip.com/datasheet...s_ha03.php

http://www.digchip.com/datasheet...A16103.php

HA16103 FPJ/FPK
Watchdog Timer
Description
The HA16103FPJ/FPK monolithic voltage control is designed for microcomputer systems. In addition to voltage regulator, it includes watch dog timer function, power on reset function, and output voltage monitor function. It is suitable for battery use microcomputer systems.
Functions
· · · · 5 V regulated power supply Power on reset pulse generator Watch dog timer Low voltage inhibit protection
Features
· Wide operational supply voltage range (VCC = 6 to 40 V) · Various control signals are generated when microcomputer system runaway occurs. (NMI signal and STBY signal are generated by detecting voltage level, and RES signal is generated by monitoring the time after NMI signal is detected) · Regulated voltage, NMI detecting voltage, STBY detecting voltage are adjustable. · At low voltage and re-start, the delay time of RES signal is adjustable · Watchdog timer filtering uses the minimum clock input pulse width and maximum cycle detection method
Ordering Information
Type No. HA16103FPJ HA16103FPK Package FP-20DA FP-20DA
HA16103 FPJ/FPK
Pin Arrangement
NC P-RUN Rf Cf RR CR GND VOadj VOUT NC
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
NC STBY VSTBYadj RES NMI VNMIadj CRES V CC VCONT NC
(Top view)
2
HA16103 FPJ/FPK
Pin Functions
No. 1 2 3 4 5 6 7 8 Pin Name NC P-RUN Rf Cf RR CR GND Voadj Description NC pin P-RUN signal input pin for watchdog timer Connect resistor Rf. Frequency bandwidth of the filter circuit depends on Rf Connect resistor Cf. Frequency bandwidth of the filter circuit depends on Cf Connect resistor R R . Reset-signal power-on time depends on RR Connect resistor C R . Reset-signal power-on time depends on CR Ground 5-V reference voltage fine-tuning pin. Connect a resistor between this pin and GND. The value of output voltage is given by VOUT = {1 + 5.34/(R1 // 2.0)} × Voadj Unit for R1: k Connect the collector of an external PNP-type transistor. The pin supplies 5-V regulated voltage for internal circuit NC pin NC pin The external PNP-type transistor's base control pin Supply voltage pin. Operating supply voltage range is 6.0 to 40 V. If the voltage of VOUT pin declines to less than Detection voltage(1) (because of an instant power cut or other cause), NMI signals are generated. If tRES 0.5·Rf·CRES(sec) has passed since then, RES signals are generated. If the voltage of VOUT pin inclines to more than Detection voltage(1) (in case of re-start from LVI state), NMI signals are stop. tr 0.5·Rf·CRES(sec) has passed since then, RES signals are stop. Connect capacitor CRES between this pin and GND to adjust the RES signals delay time(t RES, tr ). If delay time is unnecessary, make this pin open (t RES = 2 µs typ. tr = 10 µs typ. at open) NMI detection voltage fine-tuning pin. Connect a resistor between this pin and VOUT pin or GND. The value of output voltage is given by VNMI = {1 + (R2 // 25.5)/(R3 // 10.6)} × V NMIadj. Unit for R2, R3: k NMI signal output pin. Connect to pin NMI of the microcomputer RES signal output pin. Connect to pin RES of the microcomputer STBY detection voltage tuning pin. Connect a resistor between this pin and VOUT or GND. The value of output voltage is given by VSTBY = 1.89 × {1 + 21/(7.9 + 8.85 // R4)} × V STBYadj Unit for R4: k STBY signal output pin. Connect to pin STBY of the microcomputer NC pin
9 10 11 12 13 14
VOUT NC NC VCONT VCC CRES
15
VNMIadj
16 17 18
NMI RES VSTBYadj
19 20
STBY NC
3