FTDI and voltage regulation

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daemach
 
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Joined: Fri Feb 13, 2009 2:07 pm

FTDI and voltage regulation

Post by daemach »

I am working on an arduino-based custom board that has 2 1A LDO regulators. It's meant to take power from a wall wart and provide 3.3V on one rail and 5V on the other.

Currently, I have my FTDI Vcc input tied to the VIN rails, which are pre-regulator. That should work for the 3.3v regulator, but I don't think providing 5V to the input of a 5V regulator is going to work. What is the best way to tie the FTDI Vcc to the input of the 3.3v regulator and the output of the 5V regulator? Would a diode be enough? Is voltage drop going to be a problem?

Thanks in advance for any advice you can provide.

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Franklin97355
 
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Joined: Mon Apr 21, 2008 2:33 pm

Re: FTDI and voltage regulation

Post by Franklin97355 »

The Arduino UNO does what you are trying to accomplish. Take a look at it's schematic.http://arduino.cc/en/uploads/Main/ardui ... ematic.pdf

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