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ASand.1
Associate
Jan 6, 2021 3:07 PM UTC
Solved

Usable ADC5 inputs on STM32G473: Alternative functions of PortD in datasheet incomplete?

We are trying to make our first large project with an STM32G473VE MCU in an LQFP-100 package, but there seems to be a discrepancy between the number of accessible ADC input pins for ADC5 between the datasheet (rev 3, last version) and what I can select in CubeMX and what is listed in the STM32G4 manual.

Speficically, the datasheet lists only lists the following inputs as alternative functions in table 12:

Pin   ADC5_INx

PD8   12

PD9   13

PA8   1

PA9   2

(found by searching for ADC5_IN)

However, in the G4 series reference manual RM0440, pages 392 to 393 (table 69), many more inputs are listed, and these are in agreement with what I can select in STM32CubeMX. For example, I can select ADC5_IN7 through ADC5_IN11 which corresponds to PD10 through PD14 and these pins are indeed physically present.

Is the datasheet incomplete and these pins are OK to use, or have I misunderstood something?

For my application, it would be very convenient if those analog input pins for specifically ADC5 are available.

This topic has been closed for replies.
TDK
TDKBest answer
Jan 6, 2021 6:38 PM UTC

And in case it's not clear, "ADC345_INx" is shorthand for "ADC3_INx, ADC4_INx and ADC5_INx".

https://www.st.com/resource/en/datasheet/stm32g473qc.pdf

"If you feel a post has answered your question, please click ""Accept as Solution""."

3 replies

Uwe Bonnes
Chief
Jan 6, 2021 5:32 PM UTC

Look at the recent datasheet and look also for "ADC345". there are more pins reachable by ADC5.

TDK
TDKBest answer
Jan 6, 2021 6:38 PM UTC

And in case it's not clear, "ADC345_INx" is shorthand for "ADC3_INx, ADC4_INx and ADC5_INx".

https://www.st.com/resource/en/datasheet/stm32g473qc.pdf

"If you feel a post has answered your question, please click ""Accept as Solution""."
ASand.1
ASand.1Author
Associate
Jan 7, 2021 9:06 AM UTC

Ahh, thanks! I was not aware of this abbreviation. Then the documents are in agreement, and I will proceed as planned. Thanks!