A blog about electronics and programming

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  • March 23, 2017 at 4:07 pm in reply to: I2C with logic analyzer #6608
    svobodv
    Participant

    Hi,
    are you using external pull-ups?

    V.

    March 23, 2017 at 3:08 pm in reply to: Question and suggestion for Mastering STM32 eBook #6606
    svobodv
    Participant

    Hi Carmine,

    in chapter 6.2.1 at page 186 you wrote that “there is no need to use external pull-up resistors to drive I²C devices, since the corresponding GPIOs can be configured…”.
    Value of internal PU-PD for mentioned STM32F030 is typically 40k, and thats not enough for any reasonable speed of I2C. I would use 4k7 for 100kHz, 2k2 for 400kHz and 1k2 for 1MHz.

    Anyway, thank you for great book, and keep up the great work.

    Vojta

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