How to make pic output 3.3V instead of 5V

L

Lac

New Member

• Sep 10, 2004

• #1

I need my pic to output 3.3V, but I'm not able to use a couple of diods to lower the voltage, while the line is swithces between 3.3V and ground. btw: Fever componts the better.

Cheers!
Lac.

 

TiagoSilva

Member

• Sep 10, 2004

• #2

:lol: you can't !!! but there is one cool IC to solve that !!!
Check on Maxim's Level Shifter Max3370
See if that is what u need
Bye!

 

lavenatti

Member

• Sep 10, 2004

• #3

A zener.

 

TiagoSilva

Member

• Sep 10, 2004

• #4

Hmm, is there any 3.3v zener ?? cool i didn't knew, still what is a zener compared with a lever shifter hihihi :lol: :lol: :lol:

 

E

e

New Member

• Sep 10, 2004

• #5

some PICs can run at 3.3V supply, would make that easy

 

DirtyLude

Well-Known Member

• Sep 10, 2004

• #6

3.3volt pullup with open drain.

 

John Sorensen

New Member

• Sep 10, 2004

• #7

Most of the solutions mentioned above have a tradeoff with speed. If you have slow speeds, a zener will work or even a voltage divider, but if you need high speed, you'll really need a level shifter. The 74HC4050 is cheap and dirty (and plenty fast) six in a single package if you need that many.

j.

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Sep 10, 2004

• #8

Like many questions, this one is too vague - give much more detail as to what you are doing, and why!.

 

TiagoSilva

Member

• Sep 12, 2004

• #9

Mr. Nigel is right for an example if you need the pic to comunicate with 3.3v logic level devices i surelly recomend the Max IC, if it's for something more simple the zener could do the trick

 

S

StupidDum

New Member

• Sep 12, 2004

• #10

If all your I/O are meant for 3.3V, then you probably just need to use 3.3V as power supply. Some PIC support 3.3V supply.

Otherwise, you can use buffer with open collector such as 7407. This allow 2-way communication, depending on your connection and source.