topic Re: RT117x: temperature sensor in LPADC in i.MX RT Crossover MCUs

RT117x: temperature sensor in LPADC

mastupristi — Mon, 03 Apr 2023 09:27:50 GMT

I read that there is a temperature sensor connected to the internal inputs of LPADC1:

I couldn't find any other details on how to use it and how to convert the numerical value to Celsius degrees, though.

Where can I find this information?

Re: RT117x: temperature sensor in LPADC

Miguel04 — Tue, 04 Apr 2023 17:57:46 GMT

Hi @mastupristi

There is more information on the reference manual chapter 22.3.2 Temperature Sensing. Also, the sdk has examples

Best Regards, Miguel.

Re: RT117x: temperature sensor in LPADC

mastupristi — Wed, 05 Apr 2023 07:01:12 GMT

Hello Miguel,

I don't know if that helps me.

I am perfectly aware of the existence of the TMPSNS peripheral, but my question was a different one.

Since it is clearly stated in the Reference Manual that it is possible to "read" a temperature sensor using the ADC, I would have been pleased to also find an explanation of how to convert the raw number to Celsius degrees.

Should I perhaps use the same conversion as described in the TMPSNS chapter?

in my case ts_25c is 1902.0f ts_meas (from ADC) is 0x39d.

And with this data, if I haven't miscalculated, I should get -65 degrees, but I can assure you that we are at about 20