MIDI IO board on LPC17

Parts Questions
1

Hello,

Looking at the schematic of the MIDI IO board for the STM32F4, I could not find a reason why it would not work as a a MIDI 3/4 extension for the older LPC17 core. Just wire J4B, J5.A6 and .A7 properly to the J1 of the new board (& gnd/5v).

Am I correct?

2

Hi,

 

yes, you can use the same board, but since LPC17 Tx pins are working at 3.3V level (and not in push-pull mode), you’ve to change some resistor values:

R3, R5, R8 and R10 have to be 47 Ohm.

And J1:Vd has to be connected to 3.3V

 

Best Regards, Thorsten.

3

Thank you!