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# Current Value of all Input/ Output Current for STM32F103RBT6

Associate II

What will be the total output current sunk by sum of all I/Os and control pins and Total output current sourced by sum of all I/Os supplied by VDDIO2 of STM32F103RBT6?

8 REPLIES 8
ST Employee

Dear @stu1 ,

We have no VDDIO2 internal Rail in the STM32F1 series , all VDDx should be connected to the same board Rail . Here is the datasheet for more details

https://www.st.com/resource/en/datasheet/stm32f103rb.pdf

Hope it helps you .

STOne-32

Evangelist III

That will depend entirely on the external circuitry connected to those those  I/Os and control pins!

A pin driving an LED will sink/source much more current than a pin that's driving a CMOS input.

Evangelist III

That describes the limits & capabilities of the pins - but the actual currents will depend on the loads connected to the pins.

Associate II

OK. Thank You for your reply. I have read this datasheet, in that there is a parameter mentioned II/O i.e. Output current sunk by any I/O and control pin that is 25mA. but I required total output current sunk by sum of all I/Os and control pins i.e. ΣII/O. what is the maximum amount of current can be sunk /source by all the GPIOs/ control pins at a single unit of time?

Associate II

Correct. So, I required how many LEDs I can connect to this controller for single unit of time. How much amount of current all the GPIOs can handle at a time?

Evangelist III

That was answered in the images posted by @STOne-32

Associate II

Above is the datasheet of STM32F072 controller. As mentioned in above image ΣIVDD and ΣIIO(PIN) are different. and for STM32F103 RBT6 only IVDD is mentioned i.e. 150 mA. So, I want to ask you that is  ΣIVDD and ΣIIO(PIN) are same for the STM32f103? Because ΣIIO is not mentioned for STM32F103.

Evangelist III

@stu1 wrote:

I want to ask you that is  ΣIVDD and ΣIIO(PIN) are same for the STM32f103? Because ΣIIO is not mentioned for STM32F103.

Not quite: as the notes above Table 7 for the F103 tell you, ΣIVDD includes the current consumed by the MCU itself.

ie, ΣIVDD = ΣIIO(PIN) + Imcu

You can work out ΣIIO(PIN) from there ...

EDIT:

See the datasheet section 5.3.5, Supply current characteristics: