4 Replies Latest reply on Feb 15, 2016 4:10 PM by allene

    GPIO and UART Input pin voltage specification?


      I am looking for the input electrical specifications.  I can't find it anywhere.  I did read that two GPIO pins are rated at 3.3 volts but nowhere did it say which pins.


      I have a system that has a GPS and an Edison.  All I need to do is take the GPS (3.3 V) Tx pin and connect it to the Edison UART Rx pin.  A level shifter breakout board will work but I would assume so would a resistive divider.  Ideally a single resistor working against the UNSPECIFIED input resistance.  Where is the electrical specification and has anyone used just a series resistor to go from a 3.3V to the UART Rx pin?