Device and method for sensing temperature based on resistor-capacitor digital-to-analog-converter

A temperature sensing method of a temperature sensing device which includes a first sensing circuit including a first resistor and a plurality of first capacitors selectively connected to the first resistor and a second sensing circuit including a second resistor and a plurality of second capacitors selectively connected to the second resistor, the temperature sensing method comprising:

• charging at least one of the plurality of first capacitors with a power supply voltage based on a first control signal and discharging at least one of the plurality of second capacitors to a ground voltage based on the first control signal;
• discharging at least one of the plurality of first capacitors to the ground voltage through the first resistor and a first node based on a second control signal and charging at least one of the plurality of second capacitors with the power supply voltage through the second resistor and a second node based on the second control signal;
• outputting, at a comparator, a comparison signal based on a comparison of a first voltage of the first node and a second voltage of the second node according to a clock signal;
• and
• outputting, at a successive approximation register (SAR) logic circuit, digital data obtained based on based on a comparison of the comparison signal in a successive approximation register manner.

A system on chip (SoC) comprising:

• a processor core configured to receive a power supply voltage from a power management integrated circuit;
• a first sensing circuit comprising a first resistor whose resistance value linearly changes based on a temperature of the processor core and a first capacitor circuit selectively connected to the first resistor;
• a second sensing circuit comprising a second resistor whose resistance value linearly changes based on the temperature of the processor core and a second capacitor circuit selectively connected to the second resistor;
• a comparator circuit configured to output a comparison signal obtained based on a comparison of a first voltage of a first node and a second voltage of a second node;
• and
• a successive approximation register (SAR) logic circuit configured to output digital data obtained based on a comparison of the comparison signal in a successive approximation register manner,
• wherein the first capacitor circuit comprises a plurality of first capacitors,
• wherein the first sensing circuit is configured to charge at least one of the plurality of first capacitors with the power supply voltage based on a first control signal, and discharged to a ground voltage through the first resistor and the first node based on a second control signal,
• wherein the second capacitor circuit comprises a plurality of second capacitors, and
• wherein the second sensing circuit is configured to discharge at least one of the plurality of second capacitors to the ground voltage based on the first control signal, and charged with the power supply voltage through the second resistor and the second node based on the second control signal.