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TMUX1072: Switches for I2C and mitigation against IEC61000-4-4 Burst events?

AnBer
Mastermind 29390 points
Part Number: TMUX1072
Other Parts Discussed in Thread: TMUX136

Team,

See use case below:
-What is the best MUX choice for I2C interface?
-Do you advise to use TMUX1072, TS5A623157 or other?

At the system level it is important that the communication does not get disturbed by IEC61000-4-4 Burst events.
The setup is as below:

On a PCB an I2C master communicates to an I2C slave over an analog MUX (like TMUX1072, TS5A623157). IEC61000-4-4 Burst events could occur on the Master side I2C (before the MUX) and the communication might get disturbed:

I2C master <------------> MUX  <------> I2C Slave
                                 |
                            ESD burst    


-What TI MUX is better suited for such scenario?
-Do we have some design advises/guidelines (schematics, PCB layout) that can help to mitigate such issues?
-Would ESD protection (such as TPD2E2U06 ) be the best to mitigate those type of problems?
-Any TI reference design that specifically tackle IEC61000-4-4 Burst events creating interface communication issues with Analog MUXes?

Thanks in advance,

A.

  • 0
    TI__Expert 5660 points

    Hello,

    Thank you for posting to E2E. I can share a few resources that may help answer some of your questions regarding switches and multiplexers in I2C applications. 

    First, I recommend watching the following TI Precision Labs videos from the switches and multiplexers series for detailed information on how to select a switch for I2C:

    As discussed in the first video, there are four key considerations that must align with your design requirements when choosing a mux for your system: supply voltage, abs max switch current ratings, on-state resistance, and on-state capacitance. TMUX136 and TMUX1072 are devices with high bandwidth and low on-capacitance and well-suited for I2C applications. In addition, these devices have the powered-off protection feature, which will ensure that the switch remains high-impedance when the device is powered-down (VDD = 0V).

    I would also like to refer you to the following application report, "IEC 61000-4-x Tests for TI's Protection Devices" which points out in section 2.3 that a high percentage of TI's ESD protection solutions are capable and specified with IEC 61000-4-4 performance. I encourage you to seek more information about selecting a protection device for your system in the accompanying thread below:

    Best regards,
    Kate