Measuring temperature using the sensor in nRF52832

RE: Measuring temperature using the sensor in nRF52832

jinvers — Mon, 11 Nov 2024 09:41:15 GMT

Ok. Thank you very much.

Regards,

Joel

RE: Measuring temperature using the sensor in nRF52832

Hung Bui — Mon, 11 Nov 2024 08:40:57 GMT

Hi Joel,
You are right. The spec stated that "Linearity compensation can be implemented if required by the application." So yes, calibration maybe needed. But it's lineal offset so it should straight forward.

RE: Measuring temperature using the sensor in nRF52832

jinvers — Thu, 07 Nov 2024 16:23:16 GMT

Hi,
Thank you.
The chip is assembled in a PCB and perhapsis measuring some degrees more than ambient. I suppose it will be necessary some calibration or offset compensation.

Regards,

Joel

RE: Measuring temperature using the sensor in nRF52832

Hung Bui — Thu, 07 Nov 2024 15:20:38 GMT

Hi,
If you look at the specification you can find that the unit of TEMP peripheral is 0.25oC. 112 = 28oC which is quite high, but maybe it's just because in Spain it is warmer than in Norway?

RE: Measuring temperature using the sensor in nRF52832

jinvers — Thu, 07 Nov 2024 14:04:03 GMT

In fact the raw data fluctuates between 104 and 112.

Regards,

Joel

RE: Measuring temperature using the sensor in nRF52832

jinvers — Thu, 07 Nov 2024 14:00:00 GMT

Hi,

I'm sorry. I sent you the raw data of 115. What is the conversion rate?
Regards,

Joel

RE: Measuring temperature using the sensor in nRF52832

Hung Bui — Thu, 07 Nov 2024 13:41:38 GMT

Hi Joel,
What's the raw value you have ?
Could you try to test on a DK ? Do you have another board to test ?
I did a quick test here and got these result of 94 (22.75C) when booting up and it get to 103 (26C) when I breath some breaths on the chip.

RE: Measuring temperature using the sensor in nRF52832

jinvers — Thu, 07 Nov 2024 10:47:37 GMT

Hi,

Tested. It works.
However, I see a value of 11,5ºC when it should be a value around 20ºC. It's a high difference. Any calibration proces to be followed?
Regards,
Joel

RE: Measuring temperature using the sensor in nRF52832

jinvers — Wed, 06 Nov 2024 22:32:57 GMT

Hi,

Thank you. I will check it tomorrow.

Regards,

Joel

RE: Measuring temperature using the sensor in nRF52832

Hung Bui — Wed, 06 Nov 2024 15:15:58 GMT

Hi Joel,
If you have a look here: https://docs.nordicsemi.com/bundle/sds_s140/page/SDS/s1xx/sd_resource_reqs/hw_block_interrupt_vector.html

You will find that the TEMP peripheral is "restricted" when the softdevice is active.

You would need to use softdevice provided API to access it. Please use sd_temp_get() function.
Here is an example code:

    int temp;
    uint32_t err;
    err=sd_temp_get(&temp);
    APP_ERROR_CHECK(err);
    NRF_LOG_INFO("temp: %d",temp);

You should call it after the softdevice is enabled.