• Microcontroller Brown-out detection
  Most of microcontrollers have On-chip Brown-out detection, which monitors supply voltage level while operating. Brown-out circuit is simply nothing more than comparator, which compares supply voltage to a fixed trigger level.
  Mostly all microcontrollers have built in Brown-out detection (BOD) circuit, which monitors supply voltage level during operation. BOD circuit is nothing more than comparator, which compares supply voltage to a fixed trigger level.If microcontroller doesn’t have On-Chip Brown-Out detector, then there can be external circuit used :The circuit above illustrates the brown out detect
  embedded-general
  in Public bookmarks with brown-out detection detector level monitor supply voltage

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