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Original question:

TXS0102: short protection

TXS0102-Q1: Short Circuit Protection - Best Method to Protect TXS0102

Kevin Richardson
Prodigy 50 points

Part Number: TXS0102-Q1
Other Parts Discussed in Thread: TXS0102, TXU0102-Q1

Hello, 

I am currently facing an issue in determining the best path forward to adequately protect the TXS0102 from a direct short to GND at the IO port.

 

Would the best path forward be a series limiting resistor dependent on the parts maximum current output? Our circuit is using the TXS0102 to drive APA102 Clock/Data signals via a STM32 IC.

  • +1
    Guru 320660 points

    The TXS works as a passive switch. Only the edge accelerators actively drive the line high, and they run for a very short time. For the TXS itself, no short-circuit protection is necessary. (You might need to protect the STM32's output pins.)

    The APA102 signals are unidirectional; consider the TXU0102-Q1 instead.

  • 0 in reply to Clemens Ladisch
    Prodigy 50 points

    Hey Clemens, thank you for the information. I just saw the architecture, and this makes sense. If the traces providing the data/clk signals is contained within the board, it is pretty unlikely for the STM32 to be shorted. 

    I would like to opt for that part, but we are pretty far in the design and to advocate for a change would spark a whole line of testing Disappointed

    Thanks Clemens!