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TS5MP645: The status of MIPI device connecting with non active port

Hirokazu Takahashi
Expert 8420 points
Part Number: TS5MP645

Dear Support team,

As our use case, the MIPI devices connected to TS5MP645 is always active except power down mode.
This means the MIPI device connected to non active port of TS5MP645 leaves to be active.
Is such a use cases acceptable for TS5MP645?
If you have any concerns, please let me know.

Generally, is it usual that the both of device connected TS5MP645 is always active? or is it more general case that non used device will be in power down?

Best Regards,
Hirokazu Takahashi

  • 0
    TI__Mastermind 23373 points

    Takahashi-san,

    If my understanding is correct you're running two MIPI devices (Device A, and Device B) and switching between the two with TS5MP645. When Device A is selected, you want power to run to it and Device B will be turned off. When Device B is selected you will then turn it on and Device A will be powered down.

    When a channel isn't selected in the TS5MP645 that channel is in a High-Z state. So from the perspective of the TS5MP645, the connected device might as well be turned off. The only concern would be leakage and whether this was okay for the connected MIPI device to handle while it's powered off. The Max Off-State leakage of the device 0.5uA.

    Hope this helps,
    Rami Mooti

  • 0 in reply to Rami Mooti1
    TI__Expert 8420 points

    Hello Rami-san

    Thanks for your support.
    I could clearly understand your mention.
    I would like to ask one more thing about it.
    Please check the attached file.

    TS5MP645 use case (2020 08 13).pptx

    Our use case is Case 1 in the attached file. The both MIPI device is always power on regardless the selection port in TS5MP645.
    Generally, is the this case 1 usual case?
    Or is other case 2 more usual?

    Best Regards,
    Hirokazu Takahashi

  • 0 in reply to Hirokazu Takahashi
    TI__Mastermind 23373 points

    I don't know what I would call the 'general use case' but both applications would work fine on the TS5MP645 side.


    It would depend on energy consumption and how much current the device can take when powered-off. The TS5MP645 has on Off-leakage of +- 0.5 uA. If the MIPI device can handle this and you won't be switching the MIPI devices often and have proper means for power sequencing (ability for switching the MIPI devices on and off independently) than it would be beneficial from a power consumption standpoint to just turn the power off on the unused device until it needs to be used. Otherwise you could also keep them on.

    Safer approach would be to leave them on but depending on your approach you could feasibly do both methods and there is definite benefit to keep turn off unused devices.

    Hope this helps,
    Rami Mooti

  • 0 in reply to Rami Mooti1
    TI__Expert 8420 points

    Hello Rami-san

    Thanks for your great support.
    I got it.

    Best Regards,
    Hirokazu Takahashi