Patent ID: 9698771
Date: 2017-07-04
CPC Classifications: G06F,H03K

Claim:
1. A circuit, comprising: a power on reset (POR) circuit configured to monitor a supply voltage and output a POR signal in response to a comparison of the supply voltage to a POR threshold voltage; a first voltage monitoring circuit configured to monitor an input voltage and output a first voltage monitoring signal in response to a comparison of the input voltage to a first voltage monitoring threshold; an analog multiplexer circuit having a first input configured to receive the supply voltage and a second input configured to receive a variable test voltage, said analog multiplexer having an output providing said input voltage to the first voltage monitoring circuit, said analog multiplexer further having a control input configured to receive a control signal for selecting between the first and second inputs; and logic circuitry configured to logically combine the POR signal and the first voltage monitoring signal.