DYNAMIC BROWN-OUT THRESHOLD VOLTAGE FOR POWER CONTROL

摘要

A method of operating a power up circuit is disclosed. The method includes receiving an input voltage and creating a plurality of sample voltages from the input voltage. One of the sample voltages is selected and compared to a reference voltage. The power up circuit produces a brown-out signal in response to the step of comparing.

主权项

1. A circuit, comprising:
a plurality of series-connected elements coupled to receive an input voltage and produce a plurality of sample voltages; a plurality of switching devices arranged to select at least one of the sample voltages; a counter arranged to provide a signal to control the plurality of switching devices; and a comparator circuit arranged to compare the at least one of the sample voltages to a reference voltage and produce a power fail signal.