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.

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

Applications

◆ Embedded control systems

◆ Battery–operated systems

◆ Intelligent instruments

◆ Wireless communication systems

◆ PDAs and handheld equipment

◆ µP/µC power supply monitoring