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MIC706P Datasheet(PDF) 6 Page - Micrel Semiconductor |
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MIC706P Datasheet(HTML) 6 Page - Micrel Semiconductor |
6 / 8 page 6 the WDI pin will reset the watchdog timer. The output of the watchdog timer (WDO) will remain high if WDI sees a valid transition within the watchdog timeout period. If VCC falls below the reset threshold voltage then WDO goes low immediately regardless of WDI. Likewise, WDO goes high immediately after VCC exceeds the reset threshold. WDO can be connected to MR to generate a reset pulse upon watchdog timeout. Microprocessor Reset The RESET pin is asserted whenever VCC falls below the reset threshold voltage or when MR goes low. The reset pin remains asserted for a period of 200ms after VCC has risen above the reset threshold voltage and MR goes high. The reset function ensures the microprocessor is properly reset and powers up into a known condition after a power failure. RESET will remain valid with VCC as low as 1.4V. Power Fail Warning An additional comparator which is independent of other functions on the MIC706/MIC708 is provided for early warning of power failure. An external voltage divider can be used to compare unregulated DC to an internal 1.25V reference. The voltage divider ratio on the input of the power fail comparator (PFI) can be chosen so as to trip the power fail comparator a few milliseconds before VCC falls below the maximum reset threshold voltage. The output of the power fail comparator (PFO) can be used to interrupt the microprocessor when used in this mode and execute shut-down procedures prior to power loss. Watchdog Timer The microprocessor can be monitored by connecting the WDI pin (watchdog input) to a bus line or I/O line. If a transition doesn’t occur on the WDI pin within the watchdog timeout period, then WDO will go low. A minimum pulse of 50ns (4.5V supply) or 100ns (2.7V supply) or any transition low-to-high or high-to-low on + - 1.25V R1 R2 Unregulated DC PFO PFI Figure 3. Power Fail Comparator Circuit Description Figure 4. Reset Timing Diagram VCC MR RESET VRT tMR tMD tRS tRS WDO MIC706P/R/S/T, MIC708R/S/T µP Supervisory Circuits |
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