Heat sensor circuit

A heat sensor circuit, comprising:

• a sensing pixel and a reference pixel;
• a sensing unit, wherein the sensing pixel is coupled with the reference pixel at a first input terminal of the sensing unit;
• and
• a voltage generating unit, comprising a plurality of switch circuits and a voltage dividing circuit that is coupled with the plurality of switch circuits, the voltage dividing circuit being further coupled between a first supply voltage and a second supply voltage,
• wherein a first switch circuit in the plurality of switch circuits is configured to output, according to the first supply voltage, a first voltage to the sensing pixel, a second switch circuit in the plurality of switch circuits is configured to output, according to the first supply voltage, a second voltage to the reference pixel, and a third switch circuit in the plurality of switch circuits is configured to output, according to the first supply voltage, a third voltage to a second input terminal of the sensing unit,
• wherein the sensing unit is further configured to generate an output voltage according to a voltage at the first input terminal and a voltage of the second input terminal.