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Author Topic: 5V on SPI  (Read 924 times)
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I just bought a Due board and am really impressed.  I'm very new to electronics and I'm still trying to understand all of the 3.3V and 5V differences and ramifications.

// Pinout diagram
http://arduino.cc/forum/index.php?topic=132130.0

I'm a little confused about the SPI header.  If the MOSI, MISO, and SCK pins can only handle 3.3V why does the SPI supply 5V?
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It might be just for power.  I have been having discussion about real time clock unit, it is powered by 5 volts, but for communication it can use other voltages (Logic 0: -0.3 to 0.8 volts; Logic 1: 2.2 to Vcc+0.3 volts).  As you can see the communication voltages are not tied up to the voltage needed to power the device.
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What you've explained makes a lot of sense.  I used the SPI header to connect to a breakout board and it works just fine.  Thanks!
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