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HA16117FB fiches techniques PDF

Hitachi Semiconductor - CMOS Watchdog Timer

Numéro de référence HA16117FB
Description CMOS Watchdog Timer
Fabricant Hitachi Semiconductor 
Logo Hitachi Semiconductor 





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HA16117FB fiche technique
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

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