IMP1832 3.3V uP Power Supply Monitor and Reset Circuit
●Push-Button Reset
●Push-Pull Reset Outputs
■The IMP1832 microprocessor supervisor can halt and restart a “hungup” or “stalled” microprocessor, restart a microprocessor after a power failure, and debounce a manual push-button microprocessor reset switch. The IMP1832 features over 40% lower supply current than the pin compatible Dallas Semiconductor DS1832.
■Precision temperature compensated reference and comparator circuits monitor the 3.3V, VCC input voltage. During power-up or when the VCC power supply falls outside selectable tolerance limits, both RESET and RESET become active. When VCC rises above the threshold voltage, the reset signals remain active for an additional 250ms minimum, allowing the power supply and system microprocessor to stabilize. The trip point tolerance signal, TOL, selects the trip level tolerance to be either 10- or 20-percent.
■RESET and RESET outputs are push-pull.
■A debounced manual reset input, PBRST, activates the reset outputs for a minimum period of 250ms.
■Also included is a watchdog timer to stop and restart a microprocessor that is “hung-up”. Three watchdog timeout periods are selectable: 150ms, 610ms and 1,200ms. If the ST input is not strobed LOW before the time-out period expires, a reset is issued.
■Devices are available in 8-pin DIP, 8-pin SO and compact 8-pin MicroSO packages.
●Key Features
■Pin compatible with the Dallas Semiconductor DS1832
◆Over 40% lower supply current
■3.3V supply monitor
■Push-pull output
■Selectable watchdog period
■Debounce manual push-button reset input
■Precision temperature-compensated voltage reference and comparator
■Power-up, power-down and brownout detection
■250ms minimum reset time
■Active LOW and HIGH reset signal
■Selectable trip point tolerance: 10% or 20%
■Low-cost 8-pin DIP/SO and 8-pin MicroSO packages
■Wide operating temperature –40°C to +85°C
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Power Supply Monitor 、 Reset Circuit 、 microprocessor supervisor |
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Datasheet |
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Please see the document for details |
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MicroSO;DIP;SO |
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English Chinese Chinese and English Japanese |
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08/08/05 |
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Revision:A |
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131 KB |
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