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Thread: Ltc4311

  1. #1
    Senior Member brtaylor's Avatar
    Join Date
    Mar 2016
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    Portland, OR
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    Ltc4311

    Has anyone used an LTC4311 (adafruit.com/product/4756)? Did it help extend the I2C bus?

    I, anecdotally, hear people complain about I2C not working well at long distances in drones. I bought one of the Adafruit modules and tested to simply see if I could communicate with an I2C sensor (BME280) with several lengths of cable. In a bench environment, I didn't notice any improvement of the LTC4311 over using pullup resistors - they both stopped working around the same distance. Trying to decide if I should spend more time evaluating the LTC4311.

    Thanks!
    Last edited by defragster; 01-11-2022 at 12:15 AM. Reason: fix url to work

  2. #2
    Member
    Join Date
    Jan 2020
    Location
    Port Elizabeth
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    80
    brtaylor,
    it is all about capacitance on your signal bus. An oscilloscope should reveal the slew rate limiting caused by the bus capacitance.
    This information might help
    https://www.ti.com/lit/ds/symlink/p82b96.pdf

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