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IMP692AMJA Datasheet(PDF) 1 Page - IMP, Inc |
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IMP692AMJA Datasheet(HTML) 1 Page - IMP, Inc |
1 / 10 page Key Features Applications x Embedded control systems x Battery–operated systems x Intelligent instruments x Wireless communication systems x PDAs and handheld equipment x µP/µC power supply monitoring x Design improvement over Maxim MAX690A/692A/802L/802M/805L — 70% lower current than Maxim: 100 µA maximum — RESET Operation to 1.1V x Two precision supply-voltage monitor options — 4.65V (IMP690A/802L/805L) — 4.40V (IMP692A/802M) x Battery-backup power switch on-chip x Watchdog timer: 1.6 second timeout x Power failure/low battery detection x Short-circuit protection and thermal limiting x Small 8-pin SO package x No external components x Specified over full temperature range Block Diagrams + – GND Unregulated DC Regulated +5V VOUT VCC WDI 3.6V Lithium Battery 0.1 µF PFO VBATT PFI R1 R2 RESET RESET VCC GND GND VCC CMOS RAM NMI I/O LINE 690A_01.eps IMP690A IMP690A IMP690A, 692A , 692A, 802L/M, 805L , 802L/M, 805L POWER MANAGEMENT µ µP P P Poow wer Suppl er Supply Super y Supervisor visor wit with Batt h Batter ery Bac y Backup Switc kup Switchh The IMP690A/IMP692A/IMP802L/IMP802M/IMP805L simplify power supply monitoring and control in microprocessor systems. Each circuit implements four functions: Reset control, watchdog monitoring, battery- backup 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 power- loss and brown-out situations. Additional monitoring capabilities can provide an early warning of unregulated power-supply loss before the voltage regulator drops out. The important features of these four functions are: a) 1.6 second watchdog timer to keep microprocessor responsive b) 4.40V or 4.65V VCC threshold for microprocessor reset at power-up and power-down c) SPDT (single-pole, double-throw) PMOS switch connects backup power to RAM if VCC fails d) 1.25V threshold detector for power loss or general purpose voltage monitoring While these features are pin–compatible with the industry standard power–supply supervisors offered by Maxim, the IMP devices are supe- rior replacements and can reduce power requirements by 70 percent when compared to Maxim MAX690/MAX692A/MAX802L/MAX802M/ MAX805L devices. Short-circuit and thermal protection have also been added. The IMP690A/IMP802L/IMP805L generate a reset pulse when the supply voltage drops below 4.65V, and the IMP692A/IMP802M generate a reset below 4.40V. The IMP802L/IMP802M have power–fail accuracy to ±2%. The IMP805L is the same as the IMP690A except that RESET is provided instead of RESET. IMP, Inc. San Jose, CA 408-432-9100/www.impweb.com + + + VCC VOUT 1 7 5 3 PFI WDI GND VBATT 8 2 6 4 PFO IMP690A, IMP692A, IMP802L, IMP802M, IMP805L RESET (RESET) ( ) IMP805L Battery-Switchover Circuit Reset Generator Watchdog Timer 3.5V 1.25V 1.25V 0.8V 690A_03.eps Typical Application |
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