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MSP-EXP432E401Y: Using GPIO Pin as an input pin to read a 1

Kirushigan Parathan
Expert 1180 points
Part Number: MSP-EXP432E401Y

Hi,

I want to pull the pin to high from an external board, do i need a resistor between the pin and 3.3V or is there one built in the chip

  • 0
    Guru 95685 points

    In theory you don't need the resistor, but if you ever configure the pin as output-low you'll set up a very low-impedance  current path into the pin, which could damage something. There are internal pullup/down resistors, but they don't really help this case.

    Since I make mistakes all the time, I typically design in the resistor (sized according to the expected EMI environment).

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