That product and the weird discussion below it set met on the trail to find out how it worked. Sparkfun doesn't realize it works bi-directional. Their voltage dividers (on the same board!) are superfluous.
http://www.sparkfun.com/products/8745 Sent from my iPhone On 28 mrt. 2012, at 17:35, Joep Suijs <[email protected]> wrote: > It does work well indeed. Sparkfun has a compact implementation of > this: http://www.sparkfun.com/products/8745 > > Joep > > 2012/3/28 Eur van Andel <[email protected]>: >> Hi all >> >> This is hardware related, but someone might use it. >> >> Modern sensors and IC's are most often 3V3 instead of 5V. Some other (older) >> peripherals are 5V only. The power supply is easy, but the databus is >> harder. >> What we need is a 3V3 <-> 5V bi-directional level shifter. >> >> These are for sale, off course: >> >> http://nl.farnell.com/nxp/pca9306d-118/ic-i2c-bus-smbus-level-xlator-soic/dp/1831194 >> >> but are expensive, not available or both. >> >> This is a much simpler solution, just two pull-ups and a MOSFET transistor: >> >> http://www.rocketnumbernine.com/2009/04/10/5v-33v-bidirectional-level-converter >> >> Be sure to check out the original document here: >> >> http://ics.nxp.com/support/documents/interface/pdf/an97055.pdf >> >> By Herman Schutte, the father of the I2C bus. >> >> I have tried it, and yes: it works. >> >> >> --- >> >> ir EE van Andel [email protected] http://www.fiwihex.nl >> >> Fiwihex B.V. Wierdensestraat 74, NL7604BK Almelo, Netherlands >> >> tel+31-546-491106 fax+31-546-491107 >> >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> For more options, visit this group at >> http://groups.google.com/group/jallib?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/jallib?hl=en. > > -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
