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PDF HA16117FPB Data sheet ( Hoja de datos )
| Número de pieza | HA16117FPB | |
| Descripción | CMOS Watchdog Timer | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HA16117F Series
CMOS Watchdog Timer
Description
The HA16117F Series of ICs make a micro-processor (MPU) system fail-safe by monitoring its power
supply to detect voltage drops, and monitoring a P-RUN (program running) pulse to detect system crashes.
Also referred to as watchdog timers, these devices are essential in systems that aim for high levels of crash
protection. Fabricated by a CMOS process, they consume little power and are ideally suited for battery-
operated systems.
These ICs are available in versions for industrial and communications equipment and automotive
applications, as well as for consumer products.
Functions
• Power-on reset
Sends a RES signal to the MPU for a fixed time at power-on
• Watchdog timer (WDT)
Monitors a P-RUN signal from the MPU and sends the MPU a RES signal if P-RUN departs from a
set frequency range
• Auto-reset
Outputs RES signals to the MPU at clocked intervals while P-RUN remains abnormal
• Supply voltage supervision
Outputs a low RES signal if the supply voltage (same as the MPU's VCC) falls below a low threshold
level (VTL). The threshold differs for different ICs in the series, allowing designers to choose an IC
matching system requirements (see ordering information)
Features
• Low power consumption : Operating (ACC pin low) = 0.5 mW (Typ)
: Standby (ACC pin high) = 0.2 mW (Typ)
• Watchdog timer on/off control by ACC input signal
• Independent auto-reset high and low times (tRH and tRL)
• Watchdog monitoring by frequency filtering (independent of duty cycle)
• High-precision low voltage detection (±2%)
• Space- and weight-saving 8-pin SOP package
1 page  
HA16117F Series
Electrical Characteristics
(VCC = 5 V, Ta = 25°C, CF = 0.01 µF, CR = 0.1 µF, R1 = 510 kΩ, R2 = 750 kΩ)
Item
General
Operating supply current
Symbol Min
Typ Max
ICC1 —
100 —
ICC2 —
200 600
Standby supply current
ISTBY
—
43 100
Low Low voltage HA16117FPA/FPAJ VTL 4.3 4.4 4.5
voltage
threshold
detector level
HA16117FPB/FPBJ
4.1 4.2 4.3
HA16117FPC/FPCJ
3.9 4.0 4.1
ACC
P-RUN
input
WDT
RES
output
Constant
range
Hysteresis width
Low input voltage
High input voltage
Low input voltage
High input voltage
Power-on reset time
Reset-clock off time
Reset low time
Reset high time
Low setup time
High setup time
RES low voltage
RES high voltage
Reset function starting voltage
Constant range of R1 and R2
VHYS
50
100 150
VIL1
—
—
0.8
VIH1 2.0
—
—
VIL2
—
—
0.8
VIH2 2.0
—
—
tON 24 40 56
tOFF *1
78
130 182
tRL 12 20 28
tRH 36 60 84
tSL 1
——
tSH — — 1
VOL — — 0.4
VOH —
VCC —
VRES
—
0.8 1.4
K
0.55 0.6
0.8
Operating supply voltage range
VCCRNG
VTL
—
6.0
Note: 1. Reset-clock off time tOFF is provided a shown in the under figure.
Unit
µA
µA
µA
V
Test Conditions
VACC = 0 V,
fP-RUN = 100 Hz
VACC = 0 V,
fP-RUN = 20 kHz
VACC = 12 V
When VCC drops
V
V
mV
V
V
V
V
ms
ms
ms
ms P-RUN pin = 0 V
ms
ms
V IOL = 1 mA
V Open
V
— K =R2 / (R1 + R2)
V
f = 500 Hz, Duty = 50%
P-RUN
RES
tOFF
5
5 Page 
HA16117F Series
4. With a 150 kHz P-RUN signal
When fP-RUN is 100 kHz or above, the WD duty (D = 100 × (T − t2)/2T) is 25% or below.
Therefore, CR is discharged, and the RES signal is output at the instant that the pin potential
falls to the comparator circuit threshold value (VTL = 1.6 V).
P-RUN
Q
Q
A
CF
H
L
H
L
H
L
H
L
5V
3.6 V
0.9 V
0V
H
WD
L
5V
6.6 µs (150 kHz)
2T
t1 5 µs
3.2 V
CR
1.6 V
B
C
RES
0V
H
L
H
L
H
L
11
11 Page | ||
| Páginas | Total 31 Páginas | |
| PDF Descargar | [ Datasheet HA16117FPB.PDF ] | |
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