Temperature sensor circuit

A temperature sensor circuit, comprising:

• a temperature sensing module which is sensitive to temperature changes;
• a first current generator and a second current generator configured such that when the first current generator generates a first negative temperature coefficient current negatively related to temperature according to a temperature sensed by the temperature sensing module, the second current generator generates a first positive temperature coefficient current positively related to temperature according to the temperature sensed by the temperature sensing module, and when the first current generator generates a second positive temperature coefficient current positively related to temperature according to the temperature sensed by the temperature sensing module, the second current generator generates a second negative temperature coefficient current negatively related to temperature according to the temperature sensed by the temperature sensing module;
• a first current controlled oscillator and a second current controlled oscillator configured such that when the first current controlled oscillator oscillates according to the first negative temperature coefficient current and outputs the first negative temperature coefficient oscillation signal, the second current controlled oscillator oscillates according to the first positive temperature coefficient current and outputs the first positive temperature coefficient oscillation signal, and when the first current controlled oscillator oscillates according to the second positive temperature coefficient current and outputs a second positive temperature coefficient oscillation signal, the second current controlled oscillator oscillates according to the second negative temperature coefficient current and outputs a second negative temperature coefficient oscillation signal;
• and
• a first counter and a second counter configured such that when the first counter calculates the first period accumulation number of the first negative temperature coefficient oscillation signal, the second counter calculates the second period accumulation number of the first positive temperature coefficient oscillation signal, and when the first counter calculates the third period accumulation number of the second positive temperature coefficient oscillation signal, the second counter calculates the fourth period accumulation number of the second negative temperature coefficient oscillation signal, and a temperature value is acquired based on the first period accumulation number, the second period accumulation number, the third period accumulation number, and the fourth period accumulation number,
• wherein the temperature sensing module comprises a plurality of transistors, a first resistor and a second resistor, each of the resistors including a first terminal and a second terminal, a first one of the plurality of transistors being connected to a first node, another one of the plurality of transistors being connected to a fourth node, and the remaining transistors being connected to the first terminal of the first resistor, the second terminal of the first resistor being connected to a second node, the first terminal of the second resistor being connected to a third node, and the second terminal of the second resistor being connected to ground.

A temperature sensor circuit, comprising:

• a temperature sensing module which is sensitive to temperature changes;
• a current generator configured to generate a positive temperature coefficient current positively related to temperature and a negative temperature coefficient current negatively related to temperature according to a temperature sensed by the temperature sensing module respectively;
• a current controlled oscillator configured to oscillate according to the positive temperature coefficient current and the negative temperature coefficient current respectively, and to output a positive temperature coefficient oscillation signal and a negative temperature coefficient oscillation signal respectively;
• and
• a counter configured to receive a clock signal and calculate a first period accumulation number of the negative temperature coefficient oscillation signal and a second period accumulation number of the positive temperature coefficient oscillation signal in the same number of clock signal periods respectively, and to acquire a temperature value based on the first period accumulation number and the second period accumulation number,
• wherein the temperature value is proportional to
• CNT
• ptat
• CNT
• ptat
• +
• CNT
• ctat
• ,
• wherein, CNTctat is the first period accumulation number and CNTptat is the second period accumulation number.