From: Martial C. <Mar...@t-...> - 2009-05-01 18:03:24
|
Hi all, I need to connect my old 5v Avr mega128 based board over the serial connexion of the new Verdex Pro. I would like to prototype a bit before I build my own carrier board and get the verdex signal from the Console breakout pads. However these are still 3,3V. Does someone knows a 3,3v to 5v level converter in DIP package which would be widely available? Thanks Martial Châteauvieux http://www.horus-uav-systems.de |
From: Dave H. <dhy...@gm...> - 2009-05-01 18:35:37
|
Hi Martial, > I need to connect my old 5v Avr mega128 based board over the serial connexion > of the new Verdex Pro. I would like to prototype a bit before I build my own > carrier board and get the verdex signal from the Console breakout pads. > However these are still 3,3V. > > Does someone knows a 3,3v to 5v level converter in DIP package which would be > widely available? DigiKey 568-1008-5-ND is an i2c converter that should also work for serial. It's generic part number is NXP P82B96. You can go with something like this: <http://www.sparkfun.com/commerce/product_info.php?products_id=8745> For logic level serial lines, you can probably get away with just connecting the 3.3v Tx line directly to the 5v Rx line (since 3.3v will still be seen as a logic high), and using a voltage divider in the other direction (like the Sparkfun unit does). The Sparkfun one uses 2 10k resistors, which would take your 5v down to 2.5v, which will be seen as a logic 1 by the 3.3v system. Here's a bindirectional one (you could make yourself) <http://www.headfuzz.co.uk/?q=node/46> -- Dave Hylands Shuswap, BC, Canada http://www.DaveHylands.com/ |
From: Ned F. <nfo...@wh...> - 2009-05-01 18:36:09
|
Martial Chateauvieux wrote: > Hi all, > > I need to connect my old 5v Avr mega128 based board over the serial connexion > of the new Verdex Pro. I would like to prototype a bit before I build my own > carrier board and get the verdex signal from the Console breakout pads. > However these are still 3,3V. > > Does someone knows a 3,3v to 5v level converter in DIP package which would be > widely available? TI makes a series of universal level shifters that are useful. One example is the 74LVC1T45. It's not available in a DIP package, if that is what you really want, but you could find a surface mount to dip adapter at Digi-key, such as Aries 1110748. -- Ned Forrester nfo...@wh... Oceanographic Systems Lab 508-289-2226 Applied Ocean Physics and Engineering Dept. Woods Hole Oceanographic Institution Woods Hole, MA 02543, USA http://www.whoi.edu/ http://www.whoi.edu/sbl/liteSite.do?litesiteid=7212 http://www.whoi.edu/hpb/Site.do?id=1532 http://www.whoi.edu/page.do?pid=10079 |