Which MCU in STM32 family is the best selection for using SAR 16-bit ADC related project

RongShengWang · ‎2024-11-08

Questions:

1. How many STM32 families offer SAR 16-bit ADCs?

2. Which MCU in STM32 family is the best choice for using SAR 16-bit ADC related project with the lowest cost?

Thanks

STTwo-32 · ‎2024-11-08

Hello @RongShengWang

I suggest you use one of the STM32H7 MCUs mentioned in this table:

More details can be found on the AN5354.

Best Regards.

STTwo-32

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RongShengWang · ‎2024-11-08

Hi,

Thanks - I did read the docs you sent.

I still have the question - Why STM32H7 is better than STM32F3's SAR 16-bit ADC - Our focus is only on SAR 16-bit ADC and the cost -

since -

(1). We use two SAR 16-bit ADC with very low sampling rate - 10KS/s.

(2). We only use 1 external analog input on each SAR 16-bit ADC.

(3). The accuracy and the cost are to be compared.

I wish to know more details.

Thanks,

Rong

STTwo-32 · ‎2024-11-08

in fact, the STM32F3 will be the best choice as a price. But as you can see on the ARM®Cortex®-M4 32b MCU+FPU, up to 256KB Flash+32KB SRAM, timers, 4 ADCs (16-bit Sig. Delta / 12bit SAR), 3 DACs, 2 comp., 2.0-3.6 V the STM32F3 include 12-bit SAR and 16-bit Sig Delta ADC:

But, what you were asking for is SAR 16-bit ADCs that is available on the STm32H7 that I've mentioned you.

Best Regards.

STTwo-32

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RongShengWang · ‎2024-11-08

Thanks,

You said "in fact, the STM32F3 will be the best choice".。

Why -

1. Because the accuracy of SAR 16-bit ADC in STM32F3 is better than STMH7?

2. Because of its lower price?

Could you specify the part number in STM32F3 for me? Thanks,

Rong

STTwo-32 · ‎2024-11-08

Sorry, i've forget to mention that the STM32F3 is the best choice based on the price. But, the STM32F3 does not implement SAR 16-bit ADC but SAR 12-bit ADC and 16-bit Sig Delta (not SAR) ADC as mentionned on the datasheet linked in my previous post (and the screenshos of my previous post).For the parts rhat we are toking about are the STM32F373 and STM32F378.

Best Regards.

STTwo-32

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SofLit · ‎2024-11-08

Hello,

@RongShengWang wrote:

1. Because the accuracy of SAR 16-bit ADC in STM32F3 is better than STMH7?

For the moment, and for MCUs, only STM32H7 family (Example: STM32H750/STM32H742) has SAR 16-bit ADC, others have 16-bit ADC but it's a Sigma Delta ADC Ex: STM32F373.

STM32MP family has also 16bits SAR but it's a microprocessor.

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RongShengWang · ‎2024-11-08

Hi,

For our application, we can't use Sigma-Delta ADC - we must use SAR 16-bit ADC.

How many choices we have now and why? What is the part number?

Thanks,

Rong

STTwo-32 · ‎2024-11-08

I've mentionned all possible part numbers in my first comment :

Best Regards.

STTwo-32

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SofLit · ‎2024-11-08

We've already provided you the answer: only STM32H7 family.

It's the same ADC characteristics over the STM32H7 family. Still to find which MCU part number fitting your needs (memory, GPIOs, comm peripherals etc ..).

You can use STM MCU finder tool or CubeMx to find one:

From STM MCU finder tool:

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