steinar96
Member level 5
Greetings.
I'm looking for discussion on the disadvantages of weak microcontroller internal pullups (100k) on professional pcb's. What comes into mind is lesser susceptibility against EMI transients then with stronger external pullups (4.7-10k), but with digitally filtered inputs with time constants on the order of 3-4 milliseconds a transient should rarely have an effect.
Has anyone noticed problems in practise with these internal pullups on lines with no capacitance except parasitic trace capacitance ?
I'm looking for discussion on the disadvantages of weak microcontroller internal pullups (100k) on professional pcb's. What comes into mind is lesser susceptibility against EMI transients then with stronger external pullups (4.7-10k), but with digitally filtered inputs with time constants on the order of 3-4 milliseconds a transient should rarely have an effect.
Has anyone noticed problems in practise with these internal pullups on lines with no capacitance except parasitic trace capacitance ?