Patent ID: 7119526
Filing Date: 2006-10-10
Classification: G05F

Abstract:
1. An integrated circuit with a voltage monitor circuit, for monitoring the supply voltage of the integrated circuit, which integrated circuit is processor based, comprising: a processor; an bandgap circuit having first and second pn junctions, said bandgap circuit driven by the supply voltage to be monitored; a first node associated with said first pn junction for providing a first voltage and driven by the supply voltage to be monitored, which said first voltage varies as a function of the voltage to be monitored at a first rate; a second node associated with said second pn junction that provides a second voltage and driven by the supply voltage to be monitored, which said second voltage varies as a function of the voltage to be monitored at a second rate different than said first rate; and a comparator circuit having a first input coupled to a voltage produced by said first node, and a second input coupled to a voltage produced by said second node to determine when said first and second voltages are within a predetermined separation and polarity, and provide as an output a reset signal to the processor.