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HA16117FPBJ Datasheet

  • HA16117FPBJ

  • CMOS Watchdog Timer

  • 249.65KB

  • 31頁

  • HITACHI

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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
鈥?/div>
Power-on reset
錚?/div>
Sends a
RES
signal to the MPU for a fixed time at power-on
鈥?/div>
Watchdog timer (WDT)
錚?/div>
Monitors a P-RUN signal from the MPU and sends the MPU a
RES
signal if P-RUN departs from a
set frequency range
鈥?/div>
Auto-reset
錚?/div>
Outputs
RES
signals to the MPU at clocked intervals while P-RUN remains abnormal
鈥?/div>
Supply voltage supervision
錚?/div>
Outputs a low
RES
signal if the supply voltage (same as the MPU's V
CC
) falls below a low threshold
level (V
TL
). The threshold differs for different ICs in the series, allowing designers to choose an IC
matching system requirements (see ordering information)
Features
鈥?/div>
Low power consumption : Operating (ACC pin low) = 0.5 mW (Typ)
: Standby (ACC pin high) = 0.2 mW (Typ)
鈥?/div>
Watchdog timer on/off control by ACC input signal
鈥?/div>
Independent auto-reset high and low times (t
RH
and t
RL
)
鈥?/div>
Watchdog monitoring by frequency filtering (independent of duty cycle)
鈥?/div>
High-precision low voltage detection (鹵2%)
鈥?/div>
Space- and weight-saving 8-pin SOP package

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