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PCA9306: PCA9306 3.3V to 5V I2C level translator not working

suresh bk
Prodigy 10 points
Part Number: PCA9306

Hi TI Team,

We are using the part PCA9306DCUR to level translate from 3.3V to 5V I2C interface. The flow is as shown below. 

We are able to read the I2C address of the fan controller device but when we try to read the data we are not able to read properly.

is it fine to have I2C repeater followed by I2C level translator ?

  • 0
    Guru 268730 points

    This can work.

    The PCA9306 is a passive switch, so the pull-up resistors in both sides act in parallel. The 2.2 kΩ is probably too strong.

    To find out what might be wrong with the signal, show an oscilloscope trace.

  • 0
    TI__Guru 56270 points

    Hi Suresh,

    As Clemens pointed out, the block diagram for your system looks like it should work. 

    Getting scope shots from the FPGA and the Fan of their SDA/SCL signals all on one scopeshot would help us figure out what the problem may be. Are you able to get scope captures.

    -Bobby