ADC calibration setup. What does it do

RE: ADC calibration setup. What does it do

Hieu — Wed, 30 Apr 2025 22:41:20 GMT

Hi Dat3108,

Unfortunately, I can't share how the nRF54L SAADC calibration works under the hood. However, I have confirmed that to get the best ADC accuracy, you should perform calibration as often as possible.

My apology for there being so little information despite the long wait.

Hieu

RE: ADC calibration setup. What does it do

Hieu — Wed, 23 Apr 2025 07:53:37 GMT

Hi Dat3108,

My apology, a colleague pointed out that the SAADC on the nRF54L15 has some design changes from the nRF52 and nRF53, so I redacted all the incorrect assumptions in my previous reply. I have started an internal query to get more accurate information.

Hieu

RE: ADC calibration setup. What does it do

Hieu — Tue, 22 Apr 2025 20:27:20 GMT

Hi Dat3108,

Hieu

RE: ADC calibration setup. What does it do

Dat3108 — Mon, 21 Apr 2025 04:32:20 GMT

Hi Hieu,

Thank you for your reply.

I have another question. In the datasheet it said the calibration is for temperature offset calibrate, so what exactly does this calibration do? Does it take a reference to a specific temperature (room temperature or absolute temperature, etc...) to make its calibration?

I just want to know to what extent can I improve the ADC in order to use the chip's ADC as good as possible for my application.

Thanks!

RE: ADC calibration setup. What does it do

Hieu — Tue, 15 Apr 2025 10:56:48 GMT

Hello Dat3108,

[quote user=""]I believe that the MCU has already a ADC calibrate value (or several values, due to temperature offset, ADC gain & offset error, ...) when it is tested at factory, and this value can be stored in the memory. Does the nRF54L15 have this value and can I get/read it from memory?[/quote]

The SAADC in the nRF54L15 doesn't have such calibration data stored in memory. Instead, it can calibrate itself, and the calibration can be triggered by the application/firmware.

Considering that fact and the comment above the calibrate flag, I would understand that the flag controls whether a calibrate is automatically done before each sampling.

For more information about the SAADC, please refer to the nRF54L15 Datasheet: https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/saadc.html.

Hieu