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I2C range externder for FDC2214 Capacitive Sensor

Mario Cortese
Prodigy 240 points
Other Parts Discussed in Thread: FDC2214, P82B715

Dear Community,


I'm implementing in my design a FDC2214 sensor. The chip has a I2C interface and I need to line-driver it to go in an harsh environment. I have seen the P82B715. I have a couple of questions:

1 - Can be the P82B715  a good solution?

2 . Witch kind of components do I need to add to have full isolation of DC part and signal part?


Best

M

 

  • 0
    TI__Guru 62920 points
    Hi Mario,

    I don't have much experience with the P82B715 device, but if you have any specific questions on it I would recommend posting on the "/etc... Interface" forum. That forum should be monitored by the support team for that device. My understanding, though, is that this part can be used to buffer I2C signals through a strong (low-impedance) driver. This can be a good solution for running over longer cables or could be useful if the stronger driver results in lower noise coupling onto the link.

    Another solution would be to convert the I2C lines into a balanced differential signaling standard like RS-485 or M-LVDS. Since these standards use differential rather than single-ended signaling, they are inherently more noise immune (since noise that affects both halves of the signal equally would be rejected by a differential receiver).

    If you need galvanic isolation in order withstand large voltage potentials between the sensor and your controlling circuitry, then I would recommend looking into our digital isolator products. You can find more information about them here: http://www.ti.com/isolation.

    Regards,
    Max