HA16117F Overview
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...
HA16117F Key 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
- Function Power supply voltage input Watchdog timer (WDT) input Connected capacitor C F determines WDT filter characteris
HA16117F Applications
- 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 diffe