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MIC708R Datasheet(PDF) 8 Page - Micrel Semiconductor |
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MIC708R Datasheet(HTML) 8 Page - Micrel Semiconductor |
8 / 10 page Micrel, Inc. MIC706P/R/S/, MIC708R/S/T Application Information An additional comparator which is independent of the other functions on the MIC706P and 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 shutdown procedures prior to power loss. Hysteresis can be added to this comparator with external resistors, as is commonly done with any comparator. Figure 2. Power-Fail Comparator Watchdog Timer The microprocessor can be monitored by connecting the WDI pin (watchdog input) to a bus line or an I/O line. If a transition doesn't occur on the WDI pin within in the watchdog timeout period, then /WDO will go low. A minimum pulse of 100ns or any transition low-to-high or high-to-low on 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 period. If VCC falls below the reset threshold voltage, then /WDO goes low immediately regardless of WDI. /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. May 28, 2014 8 Revision 2.0 |
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