Digital_power_monitor_with_early_warning

Published:2009/7/24 12:21:00 Author:Jessie | From:SeekIC

This circuit shows a DS1236 that is used to control a digital-system power supply. The DS1236 generates a nonmaskable interrupt (NMI ) for early warning of power failure to a microprocessor. A precision comparator monitors the voltage level at the In pin, relative to an internal reference. The In pin is a high-impedance input that allows for a user-defined sense point. An external resistor voltage divider interfaces with voltage signals. The sense point can be taken from the 5-V supply or from a higher voltage level that is closer to the main system power input. Because the In trip point VTP is 2.54 V，the proper values for R1 and R2 can be determined by the equations. Dallas Semiconductors, Product Data Book, 1992/1993, p. 7-74.



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