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How to convert 5V PIC16F877 output to 3.3V using resistors?

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zahidkhan

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I am using PIC 16F877 and i want to convert the 5V output from one ot its pins to 3.3V using resistors.how should i do it. i need to know the value of resistor and how to calculate it.
regards...
 

IanP

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    zahidkhan

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zahidkhan

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Re: steping down 5V

thanks IanP. actually i am using Lassen iQ GPS Module.which operates at 3.3V.i want to communicate with its serial ports through pic. this is the whole scenario.
 

IanP

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Re: steping down 5V

In this instance 1kΩ resistors and 3.3V zener diodes should do the job ..

Regards,
IanP
 

CM600

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Re: steping down 5V

You can do it with optoisolator like PC816.
 

davemaster

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Re: steping down 5V

zahidkhan said:
thanks IanP. actually i am using Lassen iQ GPS Module.which operates at 3.3V.i want to communicate with its serial ports through pic. this is the whole scenario.

Greetings,

Just use a couple of resistors to build a voltage divider.

Exp.

In Fig.

Vo = (5V*2.2k)/3.4k ~ 3.3V --> Vo=V*R2/(R1+R2)

Chage this according the resistors values in your hands.

Good Luck.
 

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