HA16103 Datasheet, PDF (3/21 Pages) Hitachi Semiconductor – Watchdog Timer

HA16103 FPJ/FPK
Pin Functions
No.
Pin Name
1
NC
2
P-RUN
3
Rf
4
Cf
5
R_R
6
C_R
7
GND
8
Voadj
9
V_OUT
10
NC
11
NC
12
V_CONT
13
V_CC
14
C_RES
15
V_NMIadj
16
NMI
17
RES
18
V_STBYadj
19
STBY
20
NC
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 R_R
Connect resistor C_R. Reset-signal power-on time depends on C_R
Ground
5-V reference voltage fine-tuning pin. Connect a resistor between this pin and
GND. The value of output voltage is given by
V_OUT = {1 + 5.34/(R1 // 2.0)} × Voadj Unit for R1: kΩ
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 V_OUT pin declines to less than Detection voltage(1) (because of
an instant power cut or other cause), NMI signals are generated.
If t_RES ≈ 0.5•Rf•C_RES(sec) has passed since then, RES signals are generated.
If the voltage of V_OUT pin inclines to more than Detection voltage(1) (in case of
re-start from LVI state), NMI signals are stop. t_r ≈ 0.5•Rf•C_RES(sec) has passed
since then, RES signals are stop. Connect capacitor C_RES between this pin and
GND to adjust the RES signals delay time(t_RES, t_r). If delay time is unnecessary,
make this pin open (t_RES = 2 µs typ. t_r = 10 µs typ. at open)
NMI detection voltage fine-tuning pin. Connect a resistor between this pin and
V_OUT pin or GND. The value of output voltage is given by
V_NMI = {1 + (R2 // 25.5)/(R3 // 10.6)} × V . _NMIadj Unit for R2, R3: kΩ
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
V_OUT or GND. The value of output voltage is given by
V_STBY = 1.89 × {1 + 21/(7.9 + 8.85 // R4)} × V_STBYadj Unit for R4: kΩ
STBY signal output pin. Connect to pin STBY of the microcomputer
NC pin
3