Patent ID: 9594099
Date: 2017-03-14
CPC Classifications: G01R

Claim:
1. A method for detecting a brown-out condition, comprising: providing a comparator having a first input, a second input, and an output, a latch having a first input, a second input, and an output, a first delay circuit having a first input, a reset input, and an output, and a second delay circuit having a first input, a reset input, and an output, the output of the comparator coupled to the first input of the latch, the first input of the first delay circuit coupled to the output of the latch, the first input of the second delay circuit coupled to the output of the first delay circuit, the output of the latch coupled to the reset input of the first delay circuit and to the reset input of the second delay circuit through an inverter, and the output of the second delay circuit is coupled to the second input of the latch; generating a comparison voltage at the output of the comparator by comparing a first voltage appearing at the first input of the comparator with a reference voltage appearing at the second input of the comparator; latching the comparison voltage to the first input of a first delay circuit; starting the first delay circuit in response to the latched comparison voltage to generate a first delayed latched comparison voltage, after a first delay time, at the first input of a second delay circuit; starting the second delay circuit to generate a second delayed latched comparison voltage, after a second delay time, at the second input of the latch; detecting a fault condition in response to the comparison voltage being at a first level.