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Pull up/down resistors on PCB?

Question asked by Simon Andersen on Jun 25, 2017
Latest reply on Jun 27, 2017 by Simon Andersen

I am designing a PCB which uses the STM32F446 MCU. I have the first revision done and working. But I am wondering if all the pull-up and -down resistors on the board can be excluded and use the internals instead?


The board has the following components connected with pull up/down:


->Micro SD card in SPI mode

->User button

->UART connection with other board


When should you use external resistors and when can you rely on the internals?


Thank you for any thoughts on the topic.