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I'am working with Stm32f4 discovery board , i need to know the right value of the pull up resistor on the GPIO port

all there is on the datasheet is : week pull up

page 277 of the stm32f407 datasheet

Thank you

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  • \$\begingroup\$ If you need to design to a precise value, and part count doesn't matter, you might consider disabling the pullup and providing your own. \$\endgroup\$ – Scott Seidman Dec 11 '15 at 23:49
  • \$\begingroup\$ @werberbang Unless you only are doing tests you can use internal pulls, otherwise, I recommend to use externall pullups or pulldowns and disable internal pulls. Its better to take control of value externally and not stress MCU. \$\endgroup\$ – Gabriel Rezende Germanovix Dec 13 '15 at 1:53
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From the STM32F405/7 datasheet

R_PU and R_PD table

Since you didn't say what processor it uses, I guessed.

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