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
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