Figure 27 in the STM32F446 data sheet wrong - Anyone knows what is correct?

[AWeis.5]

Hi everybody,

I want to compensate the internal RC oscillator drift in a STM32F446RCT6. My idea is to measure the internal temperature and the trim the RC oscillator according to this using the designated register for it. Unfortunately the diagram of the typical drift in the data sheet (figure 27) makes absolutely no sense. The temperature goes from -40 over 0, 25, 5, 8, 105 to 125°C. Does anybody know the correct values or if there is just a simple table for it?

Thanks in advance.

[Danish1]

My guess is that it's a font problem and '5' should read 50; '8' should read 80

[KDJEM.1]

Hello @AWeis.5​  and welcome to the Community 🙂 ,

Thank you for bringing this issue to our attention.

"-40,0,25,5,8,105,125" temperatures values for x-axis label are wrong and should be "-40,0,25,55,85,105,125".

I reported this issue internally.

Internal ticket number: 154566 (This is an internal tracking number and is not accessible or usable by customers).

When your question is answered, please close this topic by choosing Select as Best. This will help other users find that answer faster.

Kaouthar

[waclawek.jan]

Note, that there's a significant spread of possible output at any given temperature (especially at the extremes) probably due to manufacturing tolerances, so you'll need to calibrate the devices individually.

JW