HIT HA16103PJ, HA16103FPK, HA16103FPJ Datasheet
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. Package
HA16103FPJ FP-20DA
HA16103FPK FP-20DA
HA16103 FPJ/FPK
2
Pin Arrangement
P-RUN
GND
NC
NC 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20 NC
(Top view)
Rf
Cf
R
C
R
R
V
Oadj
V
OUT
STBY
V
RES
NMI
C
V
V
NC
STBYadj
V
NMIadj
RES
CONT
CC
HA16103 FPJ/FPK
3
Pin Functions
No. Pin Name Description
1 NC NC pin
2 P-RUN P-RUN signal input pin for watchdog timer
3 Rf Connect resistor Rf. Frequency bandwidth of the filter circuit depends on Rf
4 Cf Connect resistor Cf. Frequency bandwidth of the filter circuit depends on Cf
5R
R
Connect resistor RR. Reset-signal power-on time depends on R
R
6C
R
Connect resistor CR. Reset-signal power-on time depends on C
R
7 GND Ground
8 Voadj 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
9V
OUT
Connect the collector of an external PNP-type transistor. The pin supplies 5-V
regulated voltage for internal circuit
10 NC NC pin
11 NC NC pin
12 V
CONT
The external PNP-type transistor’s base control pin
13 V
CC
Supply voltage pin. Operating supply voltage range is 6.0 to 40 V.
14 C
RES
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
, tr). If delay time is unnecessary,
make this pin open (t
RES
= 2 µs typ. tr = 10 µs typ. at open)
15 V
NMIadj
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
16 NMI NMI signal output pin. Connect to pin NMI of the microcomputer
17 RES RES signal output pin. Connect to pin RES of the microcomputer
18 V
STBYadj
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
19 STBY STBY signal output pin. Connect to pin STBY of the microcomputer
20 NC NC pin
HA16103 FPJ/FPK
4
Block Diagram
Error
amplifier
Comparator
for STBY
Starter circuit
Reference
voltage
generator
Delay
circuit
Comparator
for RES
Comparator
for NMI
Power on reset
and automatic
reset circuit
Band-pass
filter circuit
Watchdog
timer
3
R
f
4
C
15 5 6
7
GND
17
C
RES
RES
V
STBYadj
18
16
NMI
14
19
STBY
V
CC
912
V
CONT
13
8
P-RUN
2
5.34 k
2 k
3.3 k
Ω
Ω
V
OUT
V
oadj
Ω
R
R
C
R
V
NMIadj
f
V
OUT
3.3 k
Ω
3.3 k
Ω
+
1000 pF
HA16103 FPJ/FPK
5
Functional Description
Stabilized Power Supply Function
The stabilized power supply includes the following features:
• Wide range of operating input voltage from 6 V to 40 V to provide stabilized voltages
• Availability of any output current, by simply replacing the external transistor
• Fine adjustment of output voltage
Figure 1 shows the fine adjustment circuit of the output circuit. Select the resistor R1 as shown in
equation 1.
Add a resistor between GND and Voadj to increase the output voltage.
HA16103
To microcomputer system
C1
100 µF
V
CC
V
GND
V
Q1
BATT
CONT
V
OUT
R
1
Vout = (1+ ) Voadj ⋅ ⋅ ⋅ ⋅ Equation 1
5.34
R // 2.0
×
1
(Voadj 1.31V)
(R1: kΩ)
Figure 1 Fine Adjustment Circuit of Output Voltage
0510
5
4
3
2
1
1 A
(Ta = 25°C)
Input voltage V
CC
(V)
Output voltage (V)
I = 0.1 A
OUT
0.5 A
1 : 1
Figure 2 Output Voltage Characteristic
HA16103 FPJ/FPK
6
Power-On Reset Function
The system contains the power-on reset function required when a microcomputer is turned on.
The reset period may be set with external components RR and CR. Equation 2 specifies how to determine
the reset period (ton) and figure 3 shows the characteristic of the circuit.
RES
HA16103
RC
t = 0.46 x C x R x Vout(s) ⋅ ⋅ ⋅ ⋅ Equation 2
R : Ω
R
R
on
RR
R
200 m
180 m
160 m
140 m
120 m
100 m
80 m
60 m
40 m
20 m
0
Resistance R
R
(Ω)
(Ta = 25°C)
VCC = 12 V
CR = 0.22 µF
CR = 0.1 µF
CR = 0.047 µF
100 k 500 k200 k
Power-on time ton (s)
Figure 3 Characteristic of Power-On Reset Circuit
HA16103 FPJ/FPK
7
Watchdog Timer Function
The system contains a bandpass filter for pulse width detection, which outputs a reset pulse when input
pulses are not at the preselected frequency (at either a higher or lower frequency).
The RC characteristic of the bandpass filter may be set with external components Rf and Cf. Equation 3
specifies how to determine the minimum pulse width (tmin) for runaway detection of the bandpass filter,
and figure 4 shows the characteristic of the filter.
HA16103
Rf Cf
tmin = Cf x Rf x 0.11 (s) ⋅ ⋅ ⋅ ⋅ Equation 3
Rf : Ω
2.0 m
1.8 m
1.6 m
1.4 m
1.2 m
1.0 m
0.8 m
0.6 m
0.4 m
0.2 m
Resistance Rf (Ω)
Cf = 0.022 µF
Cf = 0.01 µF
Cf = 0.0047 µF
100 k 500 k
Runaway-detection minimum pulse width tmin (s)
200 k
(Ta = 25°C)
P—Run pulse duty ratio 50% (fixed)
V = 12 V
C = 0.1 F
R = 180 k
CC
R
R
Ω
µ
Figure 4 Characteristic of Power-On Reset Circuit
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