Teensy 4.1 MIDI iN using 6N138 5V or 3.3V
- Thread starter DragonSF
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ETMoody3
Well-known member
As far as I know No, the 6N138 does not work at 3.3 v.
Look at the Adafruit midi feather wing which operates directly with 3.3v logic or consider a suitable logic level shifter like TXS0108E
https://www.adafruit.com/product/4740
Alternative is to use this schematic which powers the 6N138 at 5 v but pulls the output logic to a safe 3.3v.
Look at the Adafruit midi feather wing which operates directly with 3.3v logic or consider a suitable logic level shifter like TXS0108E
https://www.adafruit.com/product/4740
Alternative is to use this schematic which powers the 6N138 at 5 v but pulls the output logic to a safe 3.3v.
Last edited:
PaulStoffregen
Well-known member
6N138 does indeed require 5V power.
But it can give a 3.3V output signal while running on 5V power. Its output is open collector, so just connect the 470 ohm pullup resistor to 3.3V. See the schematic on this page for details:
https://www.pjrc.com/teensy/td_libs_MIDI.html
But it can give a 3.3V output signal while running on 5V power. Its output is open collector, so just connect the 470 ohm pullup resistor to 3.3V. See the schematic on this page for details:
https://www.pjrc.com/teensy/td_libs_MIDI.html
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