STM32H7B3I-DK ADC Control register(ADC_CR) BOOST bits

[SPark.28]

I'm checking the ADC operation with STM32H7B3I-DK board.

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To set adc clock frequency up to 50MHz​, i tried to change BOOST bits of ADC_CR register.

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However, unlike the rm0455 document that states that bits 8 and 9 (BOOST bits region) can be set, when checking in debugging mode in the IDE tool, only bit 8 seemed to be changeable.

I want to know the difference between the contents of the datasheet and the status shown in the register status window in debugging mode.

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[Imen.D]

Hello @SPark.28​ ,

I am checking this issue and I will come back to you soon with update.

Thanks

Imen

[SPark.28]

Thank you so much..​

[Imen.D]

Hello @SPark.28​ ,

There is a difference and change between the "STM32H7 silicon Rev Y" and Rev above in the ADC Boost setting.

This is not a bug, it is an intentional change, and it is supported in the HAL/LL (by reading the device ID before applying the right register setting).

Main difference between revision V and revision Y is highlighted in this dedicated AN5312

 

Hope that I've answered your question. If this the case, please close this post by choosing "Select as Best". This will help other users find that answer faster.

Imen

[SPark.28]

At 14 bit resolution, the fact that the maximum sampling rate achieves 5 MHz doesn't change, right?

[SPark.28]

All related issues have been resolved.

Thank you.