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MIC1832N Datasheet(PDF) 6 Page - Micrel Semiconductor |
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MIC1832N Datasheet(HTML) 6 Page - Micrel Semiconductor |
6 / 8 page 6 Power Monitor The RST and RST pins are asserted whenever VCC falls below the reset threshold voltage as determined by the TOL pin. A 5% tolerance level (2.88V reset threshold voltage) can be selected by connecting the TOL pin to ground and a 10% tolerance (2.55V reset threshold voltage) can be selected by connecting the TOL pin to VCC. The reset pins will remain asserted for a period of 250ms after VCC has risen above the reset threshold voltage. The reset function ensures the microprocessor is properly reset and powers up into a known condition after a power failure. RST will remain valid with VCC as low as 1.4V. Watchdog Timer The microprocessor can be monitored by connecting the ST pin (watchdog input) to a bus line or I/O line. If a high-to-low transition doesn’t occur on the ST pin within the watchdog timeout period (determined by TD pin, see Table 1), the RST and RST pins will be asserted resulting in a microprocessor reset. RST and RST will remain asserted for at least 250ms when this occurs. A minimum pulse of 75ns or any transition high-to-low on the ST pin will reset the watchdog timer. The watchdog timer will be reset if ST sees a valid transition within the watchdog timeout period. Pushbutton Reset Input The PBRST input can be driven with a manual pushbutton switch or with external logic signals. The input is internally debounced and requires an active low signal to force the reset outputs into their active states. The PBRST input will recognize any pulse that is 20ms in duration or greater and will ignore all pulses that are less than 1ms in duration. Figure 1. Power-Up/Power-Down Sequence Circuit Description 8++ 456 456 J427 8++62 J42, 8++62 Figure 3. Pushbutton Reset Figure 2. Watchdog Input RST RST tRST tPDLY PBRST tPB J6, 56 J56 Note: The maximum time between high-to-low transitions (tTD) on the watchdog input (ST) is determined by the voltage applied to the TD pin. If the watchdog input sees a high-to-low transition prior to the timeout period, the watchdog timer will be reset. MIC1832 µP Supervisory Circuit |
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Similar Description - MIC1832N |
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