TEMPERATURE SENSOR USING A CONTROLLED OSCILLATOR
Apparatuses, systems, and methods for temperature sensors are provided, including temperatures sensors using a controlled oscillator. An exemplary temperature sensor may comprise: a clock generating circuit comprising: a bandgap circuit to generate a first input signal that varies based on a temperature; a first controlled oscillator configured to receive the first input signal and generate a first clock signal; a first counter configured to receive the first clock signal and a first enable signal, wherein the first counter generates a first count signal based on the first clock signal and the first enable signal; a processor and a non-transitory memory including computer coded instructions, the computer coded instructions, with the processor, cause the processor to: determine the temperature based at least on the first count signal; and generate a temperature signal based at least on the temperature, wherein the temperature signal is a binary signal.
1 . A temperature sensor comprising:
a clock generating circuit comprising:
a bandgap circuit configured to generate a first input signal that varies based on a temperature;
one or more controlled oscillators including a first controlled oscillator configured to receive the first input signal and generate a first clock signal;
one or more counters including a first counter configured to receive the first clock signal from the clock generating circuit and a first enable signal for a first time period, wherein the first counter is further configured to generate at least a first count signal based at least on the first clock signal and the first enable signal;
at least one processor and at least one non-transitory memory including computer coded instructions thereon, the computer coded instructions, with the at least one processor, cause the processor to:
determine the temperature based at least on the first count signal; and
generate a temperature signal based at least on the temperature, wherein the temperature signal is a binary signal.
2 . The temperature sensor of claim 1 , wherein a value of the first count signal during the first time period an exponential power of 2.
3 . The temperature sensor of claim 2 , wherein to determine the temperature based at least on the first count signal the computer coded instructions, with the at least one processor, further cause the processor to perform a binary shift of the first count signal.
4 . The temperature sensor of claim 1 , wherein the first enable signal is based on a reference clock signal.
5 . The temperature sensor of claim 5 further comprising a clock divider, and wherein a reference clock signal is provided to the clock divider to generate the first enable signal.
6 . The temperature sensor of claim 1 , wherein the computer coded instructions, with the at least one processor, further cause the processor to generate the first enable signal.
7 . The temperature sensor of claim 1 , wherein the first input signal is linearly dependent based on a temperature.
8 . The temperature sensor of claim 7 , wherein the first input signal varies proportionally to absolute temperature or varies negatively-proportionally to absolute temperature.
9 . The temperature sensor of claim 1 , wherein the bandgap circuit is further configured to generate a second input signal that varies based on the temperature;
wherein the one or more controlled oscillators include a second controlled oscillator configured to receive the second input signal and generate a second clock signal;
wherein the one or more counters include a second counter configured to receive the second clock signal from the clock generating circuit and the first enable signal, wherein the second counter is further configured to generate at least a second count signal based at least on the second clock signal and the first enable signal; and
wherein to determine the temperature based at least on the first count signal and the second count signal.
10 . The temperature sensor of claim 1 , wherein to determine the temperature is further based at least on a gamma signal and an offset signal.
11 . A method comprising:
generating, with a clock generating circuit, a first clock signal, wherein generating the first clock signal comprises:
generating, with a bandgap circuit, a first input signal, wherein the first input signal varies based on a temperature;
receiving the first input signal at a first controlled oscillator of one or more controlled oscillators;
generating the first clock signal with the first controlled oscillator based on the first input signal;
receiving, at a first counter of one or more counters, the first clock signal and a first enable signal for a first time period;
generating, with the first counter, a first count signal based at least on the first clock signal and the first enable signal;
determining the temperature based at least on the first count signal; and
generating a temperature signal based at least on the temperature, wherein the temperature signal is a binary signal.
12 . The method of claim 11 , wherein a value of the first count signal during the first time period an exponential power of 2.
13 . The method of claim 12 , wherein determining the temperature based at least on the first count signal the computer coded instructions comprises a binary shift of the first count signal.
14 . The method of claim 11 , wherein the first enable signal is based on a reference clock signal.
15 . The method of claim 11 further comprising:
generating, by a clock divider, the first enable signal based on the reference clock signal.
16 . The method of claim 11 further comprising generating, by a processor, the first enable signal, and wherein generating the temperature signal is by the processor.
17 . The method of claim 11 , wherein the first input signal is linearly dependent based on a temperature.
18 . The method of claim 11 , wherein the first input signal varies proportionally to absolute temperature or varies negatively-proportionally to absolute temperature.
19 . The method of claim 11 further comprising:
generating, with the clock generating circuit, a second clock signal, wherein generating the second clock signal comprises:
generating, with the bandgap circuit, a second input signal, wherein the second input signal varies based on the temperature;
receiving the second input signal at a second controlled oscillator of the one or more controlled oscillators;
generating a second clock signal with the second controlled oscillator based on the second input signal;
receiving, at a second counter of one or more counters, the second clock signal and the first enable signal for a first time period;
generating, with the second counter, a second count signal based at least on the second clock signal and the first enable signal; and
wherein determining the temperature is further based at least on the second count signal.
20 . The method of claim 11 , wherein determining the temperature based at least on the first count signal is further based at least on a gamma signal and an offset signal.