Patent ID: 8134402
Filing Date: 2012-03-13
Classification: G01K

Abstract:
1. A circuit for temperature sensing, comprising: a comparator circuit that is arranged to provide a trigger signal by comparing a reference signal to a temperature sensor signal; a power-on-reset generator that is arranged to provide a power-on reset signal; a gate circuit that is arranged to provide an output signal by gating a gate input signal subject to control by a gate control signal, wherein the gate input signal is based at least in part on the trigger signal, and wherein the gate control signal is based at least in part on the power-on-reset signal; and a hysteresis-and-output-sensor circuit that is configured to control the reference signal in response to a sensed signal, wherein the sensed signal is based at least in part on the output signal, and wherein the hysteresis-and-output sensor circuit is arranged to disable a hysteresis at power up, wherein the comparison of the reference signal to the temperature signal made by the comparison circuit is a temperature comparison in which a determination is made as to whether a temperature has reached a predetermined level, wherein the predetermined level is modified by a predetermined amount when hysteresis is enabled.