On 9/24/2013 5:37 PM, [email protected] wrote: > Hi, > I've got a devantech i2c SFR08 sonar and an old 5c i2c compass that I'd > like to get working with the BeagleBone Black. > Have any of you implemented a bidirectional i2c level shifter ? What do > you use, or what would you recommend ?
The older Philips I2C specifications include a section on level shifters which is conspicuously absent from the newer NXP versions. Perhaps they want you to buy a custom IC instead of using 1 FET and 1 resistor per line? Anyway, see section 18.1 and Figure 45 in the older Philips I2C spec: http://www.eng.auburn.edu/~nelson/courses/elec5260_6260/39340011.pdf The following section 18.1.1 includes a review of the circuit operation. -- Charles Steinkuehler [email protected]
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