X5001

® X5001 Data Sheet May 30, 2006 FN8125.1 CPU Supervisor FEATURES 200ms power-on reset delay Low VCC detection and reset assertion —Five standard reset threshold voltages —Adjust low VCC reset threshold voltage using special programming sequence —Reset signal valid to VCC = 1V Selectable nonvolatile watchdog timer —0.2, 0.6, 1.4 seconds —Off selection —Select settings through software Long battery life with low power consumption —<50µA max standby current, watchdog on —<1µA max standby current, watchdog off 2.7V to 5.5V operation SPI mode 0 interface Built-in inadvertent write protection —Power-up/power-down protection circuitry —Watchdog change latch High reliability Available packages www.DataSheet4U.com —8 Ld TSSOP —8 Ld SOIC —8 Ld PDIP Pb-free plus anneal available (RoHS compliant) BLOCK DIAGRAM Watchdog Transition Detector SI SO SCK CS/WDI Data Register Command Decode & Control Logic DESCRIPTION This device combines three popular functions, Poweron Reset, Watchdog Timer, and Supply Voltage Supervision in one package. This combination lowers system cost, reduces board space requirements, and increases reliability. The watchdog timer provides an independent protection mechanism for microcontrollers. During a system failure, the device will respond with a RESET signal after a selectable time out interval. The user selects the interval from three preset values. Once selected, the interval does not change, even after cycling the power. The user’s system ...