Methods and systems for voltage reference power detection

摘要

Methods and systems for detection and monitoring of power supply voltage and voltage reference circuitry are provided. In one embodiment of the invention, a first signal is set to be proportional to a power supply voltage in response to a determination from control circuitry that an output voltage of bandgap voltage reference circuitry is less than a first threshold voltage. The first signal is set to a logic low level in response to a determination from control circuitry that the output voltage of the bandgap voltage reference circuit is greater than the first threshold voltage, wherein the first threshold voltage is less than a bandgap reference voltage. A value of a reset signal is determined based at least in part on the first signal.

主权项

1. A method for determining a value of a reset signal, the method comprising:
setting a first signal to be proportional to a power supply voltage in response to a determination from control circuitry that an output voltage of bandgap voltage reference circuitry is less than a first threshold voltage; setting the first signal to a logic low level in response to a determination from the control circuitry that the output voltage of the bandgap voltage reference circuit is greater than the first threshold voltage, wherein: the first threshold voltage is less than a bandgap reference voltage; and determining the value of the reset signal based at least in part on the first signal.