Interface of two boards with SPI

hilwan · ‎2014-04-25

Posted on April 25, 2014 at 16:52

Hi,

I'm using the F3 Discovery board as a Slave with hardware chip select.

I have to communicate this board with another board using the PIC microcontroller acting as a Master.

The problem is that the pin voltage of the master is 0-5v. And so i can't interface it directly with the F3 because of the non compatibility.

I would know is someone knows a buffer circuit that permits to have 5v to 3v.

I have to convert all the pins from 5v to 3v (MOSI,MISO,SCK, CSS)?

Thanks in advance.

Mark Edwards · ‎2014-04-25

Posted on April 26, 2014 at 00:05

Do a search on Level Shifter IC. The choice of part depends on what speed signals you are using.

Try SN74LVC4245A as a start.