STM32G050C8T6 ADC_IN11: inconsistency in the datasheet?

AHame · ‎2024-04-08

Hello,

According to the datasheet PB7 can be used as ADC_IN11.

Is this an error in datasheet? ADC_IN11 is already used by PB10 and cubeMX doesn't seem to allow me to use PB7 or to remap this pin. How can I use ADC_IN11 on pin PB7 as mentioned in datasheet?

Thanks

Bubbles · ‎2024-04-22

Hi @AHame,

the DS is unclear as it indicates two possible bondings of the ADC inputs without making the distinction between packages. A decision was made to make the ADC inputs available on smaller packages even if the primary pin dedicated for the function is not available.

So LQFP48 has for example ADC_IN11 bonded to PB10, but as PB10 is not on small packages, the ADC_IN11 is rerouted to PB7 on those. But on LQFP48, ADC_In11 is only on PB10.

I explained the situation to the datasheet responsible and it should be fixed soon.

BR,

J

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Tesla DeLorean · ‎2024-04-08

Interesting catch..

Also I don't see ADC_IN14 go anywhere, and ADC_IN15 routes to PA11/PB11/PA9 and ADC_IN16 PA12/PB12/PA10, but some of those may be bond-out related

https://www.st.com/resource/en/datasheet/stm32g050c8.pdf

@SofLit

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SofLit · ‎2024-04-08

Hello all,

Need to check internally and get back to you as soon as I have a feedback.

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SofLit · ‎2024-04-09

Also I don't see ADC_IN14 go anywhere

Just for your information: ADC_IN12, ADC_IN13 and ADC_IN14 are tied internally to internal sources:

RM0454 rev 5 / Figure 32.:

I also have a doubt regarding ADC_IN16: mapped on PB12 and PA12!

Need to check..

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Bubbles · ‎2024-04-09

Generally speaking the DS is usually more accurate than tools like CubeMX

BR,

J

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Tesla DeLorean · ‎2024-04-09

Yes, didn't get to the RM when I posted. Don't see any reference in the DS.

Perhaps some "note" related to VBAT pin would be appropriate? The DS is frequently used by HW designers to get the lay-of-the-land without getting dragged into the specifics at a SW / register level.

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Tesla DeLorean · ‎2024-04-09

Would definitely agree there, but it's always good to check for internal consistency with CubeMX, .SVD files, include files and docs.

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AHame · ‎2024-04-09

Sure, I agree that the source of truth should be the datasheet not cube, but I usually use both the datasheet and Cube just to sanity check during the hardware design.

That being said my question was regarding ADC_IN11 and it is still not clear to me how I'm supposed to use PB7 configured as an ADC input ( ADC_IN11).

Should I assume that PB10 and PB7 are internally connected on the die? That would mean that if I configure the ADC channel 11 using the ADC registers I could then use both PB7 or PB10 for the input pin? Seems strange to me but that could technically be possible.

Thanks

AHame · ‎2024-04-15

@SofLit Any updates on that case ? I'll do some testing on my end but I'd like an official answer.

If the datasheet is indeed wrong I would need to spin a new board so please let me know as soon as possible.

Thanks

SofLit · ‎2024-04-16

@AHame

I didn't get a feedback yet. I will keep you informed as soon as I have one. So please be patient 🙂.

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