The IMP690A/IMP692A/IMP802L/IMP802M/IMP805L simplify power supply monitoring and control in microprocessor systems. Each circuit implements four functions: Reset control, watchdog monitoring, batterybackup switching and power-failure monitoring. In addition to microprocessor reset under powerup and power-down conditions, these devices provide battery-backup switching to maintain control in powerloss and brown-out situations. Additional monitoring capabilities can provide an early warning of unregulated power-supply loss before the voltage regulator drops out.

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Key Features

◆ Design improvement over Maxim

??? MAX690A/692A/802L/802M/805L

??? — 70 lower current than Maxim:

??????? 100μA maximum

??? — RESET Operation to 1.1V

◆ Two precision supply-voltage monitor options

??? — 4.65V (IMP690A/802L/805L)

??? — 4.40V (IMP692A/802M)

◆ Battery-backup power switch on-chip

◆ Watchdog timer: 1.6 second timeout

◆ Power failure/low battery detection

◆ Short-circuit protection and thermal limiting

◆ Small 8-pin SO package

◆ No external components

◆ Specified over full temperature range

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Applications

◆ Embedded control systems

◆ Battery–operated systems

◆ Intelligent instruments

◆ Wireless communication systems

◆ PDAs and handheld equipment

◆ μP/μC power supply monitoring

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