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SP693AEP Datasheet(PDF) 10 Page - Sipex Corporation |
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SP693AEP Datasheet(HTML) 10 Page - Sipex Corporation |
10 / 24 page Date: 4/18/05 SP691A/693A/800L/800M Low Power Microprocessor Supervisor with Battery Switch-Over © Copyright 2005 Sipex Corporation 10 The SP691A/693A/800L/800M devices are microprocessor ( µP) supervisory circuits that monitor the power supplied to digital circuits such as microprocessors, microcontrollers, or memory. The SP691A/693A/800L/800M series is an ideal solution for portable, battery- powered equipment that require power supply monitoring. The SP691A/693A/800L/800M watchdog functions will continuously oversee the operational status of a system. Implementing the SP691A/693A/800L/800M series will reduce the number of components and overall complexity in a design that requires power supply monitoring circuitry. The operational features and benefits of this series are described in more detail below. Figure 17. Typical Application Circuit of the SP691A/693A/800L/800M RESET NMI I/O LINE VCC RESET PFO WDI GND VBATT R2 R1 Unregulated DC Regulated +5V VCC PFI µP CMOS RAM1 to RAMn CEOUT BATT ON VOUT Address Decode BUS CEIN Backup Supply VCC A0-A15 0.1µF alarm system status indicator WDO LOWLINE The SP691A/693A/800L/800M series is a complete µP supervisor IC and provides the following main functions: 1) µP reset ➡ Reset output is asserted during power fluxiations such as power-up, power-down, and brown out conditions, and is guaranteed to be in the correct state for VCC down to 1V, even with no battery in the circuit. 2) µP reset ➡ Reset output is pulsed if the optional watchdog timer has not been toggled within a specified time. 3) Power Fail Comparator ➡ Provides for power-fail warning and low-battery detection, or monitors another power supply. FEATURES THEORY OF OPERATION |
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