Monday, 26 October 2015

emc - Weak internal pullups on microcontrollers and EMI susceptibility


What disadvantages can I run into when using weak internal pullups (100k) on microcontrollers? I'm wondering how susceptible lines (with only parasitic trace/component capacitance) become to EMI transients with these weak pullups.


Digital filtering with a 3-4ms window may decrease the odds of transients having an effect, but is there anything else to keep in mind on a professional PCB?




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