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ADM9690

Part Number	ADM9690
Manufacturer	Analog Devices
Description	Power Supply and Watchdog Timer Monitoring Circuit
Published	Mar 23, 2005
Detailed Description	a FEATURES Precision Voltage Monitor (4.31 V) Watchdog Timeout Monitor Selectable Watchdog Timeout—0.75 ms, 1.5 ms, 12.5...
Datasheet	ADM9690 PDF File

Overview

a FEATURES Precision Voltage Monitor (4.
31 V) Watchdog Timeout Monitor Selectable Watchdog Timeout—0.
75 ms, 1.
5 ms, 12.
5 ms, 25 ms Two RESET Outputs APPLICATIONS Microprocessor Systems Computers Printers Controllers Intelligent Instruments Power Supply and Watchdog Timer Monitoring Circuit ADM9690 FUNCTIONAL BLOCK DIAGRAM VCC VMON 4.
31V ADM9690 OSC SEL1 OSC SEL2 WATCHDOG TIMEBASE RESET(1) TIMER RESET(2) TIMER RESET(1) RESET(2) WATCHDOG INPUT (WDI) WATCHDOG TRANSITION DETECTOR GND GENERAL DESCRIPTION The ADM9690 contains a voltage monitoring comparator and a watchdog timer monitor.
It is designed to monitor the 5 V power supply to a microprocessor and the microprocessor operation via a watchdog function.
The voltage monitoring comparator monitors the voltage on VMON.
If it drops outside tolerance, as will happen during a power-fail, two reset signals are generated.
Both reset signals go active (low) simultaneously.
They will remain active while VMON is below the threshold, a...

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ADM9690 Power Supply and Watchdog Timer Monitoring Circuit - Analog Devices

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