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P82B96: /P82B715

Martin Burkart
Prodigy 210 points
Part Number: P82B96
Other Parts Discussed in Thread: P82B715, TCA9617B

Hello,

I have two questions regarding the i2c-Bus Extender P82B96. 

In datasheet it´s said that Output Low Voltage is 0,8. Our Sensor needs 0,4.
So would it be possible to use a combination of P82B96 and P82B715 ? 

Next question is regarding the schematic. Do you think the pull-up values are correct? Distance between the i2c buffers is 3m 

  • 0
    TI__Genius 17225 points

    Hello Martin,

    Do you know the capacitance of the wiring harness along with the parasitic capacitance of the board?  If you need to have a Vol to be less than 0.6V then you may need to make a compromise on data rates, by reducing the strength of the pull up resistors and dialing back the data rate.  You might be able to use other buffers that we have if you have more information about the capacitance of the cables.  Consider using the TCA9617B, I think that might be a better solution.  The Vol is less than 0.6V

    -Francis Houde

  • 0 in reply to fhoude
    Prodigy 210 points

    The cable itself has approx. 300pF. So it should work, but i have on each side of the cable a filter circuit with a capacity of 100pF against PE for each line of the cable.
    Besides we contacted the producer of our pressure sensor and he said that the Vol is even less than 0.5V (in worst case) .