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Gbnusko · 2022-08-04

I have been testing the ADC on my STM32L0 with 12-bit resolution and for some reason, every measurement I take has a 0.048 V offset. I've tried a different supply voltage (from 1.8 V to 3.3 V), but the offset stays there.This offset starts at the fir...

Gbnusko · 2022-08-05

The calibration was what I was missing, I just added this line in initialize() and it made the offset disapear. I tested my adc with the same setup and I have a precision of around 3 count (1.2mV) which is really good. Thank you for the help again!vo...

Gbnusko · 2022-08-04

Thank you for this information, I wasn't aware of the adc cal and It could be the cause of my offset, I will have to test it out. The chip im using doesn't have pins for VSSA or VREF- so im not sure how to probe them.

Gbnusko · 2022-08-04

I did a test where I outputted VrefInt and it was very stable at 1.225V (1.224V is the typical vrefint), so im fairly certaint that part is good. For the high imput impedance, I also tryed with 50 ohm but I got exactly the same offset. The gpio isn't...

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