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Original question:

Can the TS3A5018 switch the MDIO/MDC of DP83822?

TS5A23157: Switch for MDC/MDIO interface

TEJASWI ROBBI
Prodigy 60 points
Part Number: PCA9543A
Other Parts Discussed in Thread: TS5A23159, TS5A23157

Hi,

PCA9543A is 2 channel I2C bidirectional switch. Can I use the same for MDC/MDIO switching.

The requirement is MDC & MDIO interface should go to devices with same MDIO address. So, we need a switch to differentiate the different devices. The required BW of MDC/MDIO is 2.5MHz and voltage supported is 1.8V, but PCA9543A supports only frequencies upto 400KHz and voltage 2.3 to 5.5V.

Please suggest an alternate part if this part is not suitable for our requirement.

Thanks,

Tejaswi

  • 0
    TI__Mastermind 49400 points

    Tejaswi,

    The PCA9543A device cannot support frequencies higher than 400kHz, anything higher than that may cause errors to the state machine.

    I've reassigned this ticket to a different group who may be able to provide a suitable device.

    -Bobby

  • 0
    TI__Intellectual 2694 points

    Hi Tejaswi,

    We do have analog switches in the 2channel, 2:1 (SPDT) configuration that support the required bandwidth. The status of the switch is controlled by GPIO signals.

    TS5A23157 and TS5A23159 are two good options that will support the voltage and signal requirement. The TS5A23159 devices does support powered off protection feature that helps to simplify power supply sequencing as the signal voltage can come before the chip supply.

    Hope this resolves your problem and let us know if any more questions.

    Regards,

    Sandesh

  • 0 in reply to Sandesh Rawool
    Prodigy 60 points

    Hi Sandesh,

    I have checked TS5A23157 and TS5A23159 datasheets and these parts meet our requirements. This resolves our issue.

    Thanks,

    Tejaswi