Yes, it works bidirectional, for IIC. I have tested it. So, since IIC has OC outputs, I do not know if it works with other output configurations. But, if i understand the appnote frrom Philips (NXP), mentioned below, it should work. It is the same circuit and same components than the sparkfun circuit.
Hubert On Mar 28, 7:16 pm, Eur van Andel <[email protected]> wrote: > 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-... > > >> 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... > > >> 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 > > athttp://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.
