Microprocessor and regulator form in-range voltage monitor

Posted on Mar 26, 2013

Low-cost microprocessor supervisors reset controllers when power-supply voltages fall below given levels. As added protection, you can also reset the microcontroller when the power supply is too high by combining a low-cost shunt-voltage regulator with a supervisor that has a manual reset input. A simple overvoltage/undervoltage-protection circuit is easy to make (Figure 1). The circuit`s output is active (low) when the monitored supply voltage, VCC, is outside a predefined range.

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