Measuring PIC Vdd with no external components using the FVR

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Microchip’s Application Note AN1333 hints at a useful technique for measuring the Vdd of a PIC using only the internal Fixed Voltage Reference (FVR) module. This page explores how to use this for a rough measurement of the current Vdd, saving pins and reducing complexity. The application note says that: For unregulated applications, the supply voltage can be determined from a conversion of…

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