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Bruno Brentegani
Bruno Brentegani
Associate
January 18, 2018
Question

Power Supply

  • January 18, 2018
  • 2 replies
  • 698 views
Posted on January 18, 2018 at 11:14

Hi all, i'm using STM32F407VG Discovery with expansion board. I have two questions:

1 - Why when i try to connect my smt32f4 using the 5V pin and the GND pin with an external power supply without a USB connection my C application sotred in the flash of my STM32 don't start (i try to remove the  ST-LINK jumpers on the board but the problem remains) 

2- Anyone know the maximum power consumption of the STM32F4 + EXP board... I see on my supply 160mA. It's too much?

Thank you very much for the answers!

Bruno

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    2 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    January 18, 2018
    Posted on January 18, 2018 at 17:20

    Check the version of the ST-LINK firmware in use. Seem to recall V25 being an issue with USB Charger type connections.

    The jumpers just address the SWDIO/SWCLK pins, the ST-LINK still has a connection to NRST, and can clamp it low.

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    Bogdan Golab
    Bogdan Golab
    Lead
    January 18, 2018
    Posted on January 18, 2018 at 17:50

    Basic tests with volmeter to be sure that you powered the target MCU? Don't assume - just measure to be sure..

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