有关CPU电源运用的监视和系统管理设备:使用X40420,X40421作为一个电池备份开关

CPU Supervisor and System Management Devices for Battery Applications: Using the X40420, X40421 as a Battery Backup Switch
CPU Supervisor and System Management Devices for Battery
Applications: Using the X40420, X40421 as a Battery Backup Switch

Application Note July 15, 2005 AN164.0
Author: Carlos Martinez


Introduction
The X40420, X40421 devices have a Power On Reset (POR)
circuit, low voltage monitors for two supplies, an automatic
switch between a main voltage source and a backup supply, a
watchdog timer, 4kbits of EEPROM and a fault detection
register. Some of these