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Mykola_Levun
Associate III
February 6, 2025
Solved

Number of the ADCs in STM32F103RB

  • February 6, 2025
  • 4 replies
  • 789 views

Hello,
I look at the STM32F103RB datasheet and see that this microcontroller should have 2  ADCs. When I open Table 5 (see Figure 1 below in this post) in this datasheet, I see only ADC12_IN10 and so on, that is, only ADC12. Why?

Mykola_Levun_0-1738849201381.png

                              Figure 1

 

This topic has been closed for replies.
Best answer by mƎALLEm

No. ADC12_INx means it's a shared channels between ADC1 and ADC2 (two separated ADCs).

Used for example to Speed up the conversion using the interleaved mode, both ADCs are converting the same channel:

SofLit_0-1738850523119.png

Refer also to this application note AN3116 "STM32™’s ADC modes and their applications" / section 2.2 Dual fast interleaved mode:

SofLit_1-1738850861461.png

4 replies

mƎALLEm
mƎALLEm
ST Technical Moderator
February 6, 2025

Hello,

From the datasheet ADC12 starts from IN0. Could you please double check?

SofLit_0-1738849916350.png

 

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Mykola_LevunAuthor
Associate III
February 6, 2025

Yes, starts from IN0. You didn't understand the question. ADC12 maybe it's ADC1 and ADC2?

mƎALLEm
mƎALLEmBest answer
ST Technical Moderator
February 6, 2025

No. ADC12_INx means it's a shared channels between ADC1 and ADC2 (two separated ADCs).

Used for example to Speed up the conversion using the interleaved mode, both ADCs are converting the same channel:

SofLit_0-1738850523119.png

Refer also to this application note AN3116 "STM32™’s ADC modes and their applications" / section 2.2 Dual fast interleaved mode:

SofLit_1-1738850861461.png

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.
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