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Original question:

TCA9517A Maximum Supply Current

TCA9517A: Maximum output device in parallel

Kay Chen53
Expert 2225 points
Part Number: TCA9517A
Other Parts Discussed in Thread: TPS53647,

Hi there:

I'd like to check this application would be OK or not.

For this one application, we're NOT able to read the I2C address of TPS53647 (in #2)

But if we change into #1 or #3, it's able to read the TPS53647. 

if that possible to connect up to 4 device in parallel at one TCA9517A? 

simplify diagram as following

 

application:

smart NIC-card for server switch 

  • 0
    TI__Guru 62920 points
    Hi Kay,

    It's generally OK to have more than 4 devices in parallel on the B side of TCA9517A. Issues may start to arise when the number of devices increases high enough that the total load capacitance exceeds the standard I2C load limit of 400 pF.

    In this case, have you tried probing the I2C waveforms (SDA and SCL) on either side of the buffer when communication is not working? That may give us a better idea what is going wrong. Also, could you share a schematic showing your I2C bus? (Or, could you please describe what components are on this bus - i.e., pull-up resistor values, any series resistances or shunt capacitors, etc.?)

    Regards,
    Max