Failure determination circuit, physical quantity measurement device, electronic apparatus, vehicle, and failure determination method

A failure determination method comprising:

• comparing, by a determination circuit, a signal based on a first digital signal obtained by A/D converting a first analog signal that is based on a first physical quantity measurement signal by a first A/D conversion circuit and a signal based on a second digital signal obtained by A/D converting a second analog signal by a second A/D conversion circuit and determining a failure of the first A/D conversion circuit in a failure determination circuit which includes the first A/D conversion circuit that continuously A/D converts the first analog signal based on the first physical quantity measurement signal, a switching circuit that receives a plurality of signals including the second analog signal based on a first physical quantity measurement signal and a first reference voltage and outputs the plurality of signals in a time division manner, a second A/D conversion circuit that A/D converts the output of the switching circuit, and the determination circuit that compares an output signal of the first A/D conversion circuit and an output signal of the second A/D conversion circuit;
• determining, by a self-determination circuit, failure of the second A/D conversion circuit based on the signal obtained by A/D converting the first reference voltage by the second A/D conversion circuit,
• wherein a selection signal is further input to the switching circuit, and
• selecting any of a plurality of signals including the second analog signal that is input and the first reference voltage according to the selection signal and outputting the selected signal.