• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 32 subscribers
  • Views 71 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TCA39416: Can I daisy chain TCA39416 to support longer cable connection for I2C?

Dongxing He
Prodigy 30 points
Part Number: TCA39416

Tool/software:

Trying to support long cable connection of I2C. Can I put multiple TCA39416 in daisy chain to overcome bus capacitance load. If yes. is there any direction connection limitation. Such as A->B.->A->B or A->B ->B->A.

thanks.

  • 0
    TI__Mastermind 35583 points

    Hi Dongxing,

    There is no connection scheme limitation such as A-to-B or B-to-A... like some of our other I2C buffer devices. 

    TCA39416 can support larger cap loads due to the rise-time and fall-time accelerators built into the device. However I have not tested series application of multiple TCA39416's. 

    What cap load are you attempting to drive, and how long of cabling? 

    Regards,

    Tyler

  • 0 in reply to Tyler Townsend
    Prodigy 30 points

    Thank you for the reply. I don't have cap loading number. but cable can be more than 1meter. I am considering possible daisy chain situation could happening. Just want to make sure there is nothing in the chip will prevent that happening.

  • 0 in reply to Dongxing He
    TI__Mastermind 35583 points

    Dongxing,

    The connection schemes do not matter because there is no static voltage offset on this device. 

    RTA's/FTA's might be hard to implement on 1 meter of cabling due to inductive parasitic. The RTA's and FTA's drive strong. You might need series resistor footprints for dampening resistors just in case. 

    Regards,

    Tyler