Post by thread:[EE]: Level Converter needed

Hi Everyone, I run the PIC on 5V and I have a LCD module that runs on 3V. Is there any level converter IC out there that can translate 3V to 5V? It would be great if it can also be bi-directional (5V to 3V as well) Thanks for your help! Thomas _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Read your signal level specs carefully. I just got through with this excercise for a project, and found that the PIC 16C63A inputs would accept the outputs of 3.3V logic just fine. Going from the PIC's 5V to 3.3V, all I wound up needing was a voltage divider to keep from exceeding the 3.3V supply rail on my one's. > {Original Message removed}

I connect the LCD to PortB of PIC16F877. The logic high for the PIC16F877 on 5V rail is 4V. Thomas {Quote hidden}>From: Don Hyde <spam_OUTDonHTakeThisOuTAXONN.COM> >Reply-To: pic microcontroller discussion list <.....PICLISTKILLspam@spam@MITVMA.MIT.EDU> >To: PICLISTKILLspamMITVMA.MIT.EDU >Subject: Re: [EE]: Level Converter needed >Date: Fri, 27 Jul 2001 13:34:55 -0500 > >Read your signal level specs carefully. I just got through with this >excercise for a project, and found that the PIC 16C63A inputs would accept >the outputs of 3.3V logic just fine. Going from the PIC's 5V to 3.3V, all >I >wound up needing was a voltage divider to keep from exceeding the 3.3V >supply rail on my one's. > > > {Original Message removed}

Here are a couple of links with sample level converter circuits. http://www.pjrc.com/tech/mp3/sta013.html#power and http://www.semiconductors.philips.com/i2c/facts/#levelshifting I am using the later with a 2N7000 p-mosfet (to-92) package and two 47k (I think) resistors per signal. This is bi-directional and easy. There are level converter chips. Look for inverting, or non-inverting buffers of certain logic families. SN54LVC07A is one by TI. Lastly, if you have open collector outputs on both sides, just connect them directly with a 3V pullup resitstor. --BobG {Original Message removed}