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These devices combine four popular funcTIons, PoweronReset Control, Watchdog TImer, Supply VoltageSupervision, and Block Lock Protect Serial EEPROMMemory in one package. This combinaTIon lowers systemcost, reduces board space requirements, andincreases reliability.Applying power to the device acTIvates the power-onreset circuit which holds RESET/RESET active for aperiod of time. This allows the power supply and oscillatorto stabilize before the processor can execute code.The Watchdog Timer provides an independent protectionmechanism for microcontrollers. When the microcontrollerfails to restart a timer within a selectable time outinterval, the device activates the RESET/RESET signal.The user selects the interval from three preset values.Once selected, the interval does not change, even aftercycling the power.The device’s low VCC detection circuitry protects theuser’s system from low voltage conditions, resettingthe system when VCC falls below the minimum VCCtrip point. RESET/RESET is asserted until VCC returnsto proper operating level and stabilizes. Five industrystandard VTRIP thresholds are available, however,Intersil’s unique circuits allow the threshold to be reprogrammedto meet custom requirements or to fine-tunethe threshold for applications requiring higher precision.
