资 源 简 介
This device combines four popular funcTIons, Power-on ResetControl, Watchdog TImer, Supply Voltage Supervision, andBlock Lock Serial EEPROM Memory in one package. ThiscombinaTIon lowers system cost, reduces board spacerequirements, and increases reliability.Applying power to the device acTIvates the power-on resetcircuit which holds RESET active for a period of time. Thisallows the power supply and oscillator to stabilize before theprocessor can execute code.The Watchdog Timer provides an independent protectionmechanism for microcontrollers. When the microcontroller fails torestart a timer within a selectable time out interval, the deviceactivates the RESET signal. The user selects the intervalfrom three preset values. Once selected, the interval doesnot change, even after cycling the power.The device’s low VCC detection circuitry protects the user’ssystem from low voltage conditions, resetting the systemwhen VCC falls below the minimum VCC trip point. RESET isasserted until VCC returns to the proper operating level andstabilizes. Five industry standard VTRIP thresholds areavailable, however, Intersil’s unique circuits allow the thresholdto be reprogrammed to meet custom requirements or to finetunethe threshold for applications requiring higher precision.
