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TPS65987DDJ: VBUS input selection and OR diode

Errol Leon6
Expert 5850 points

Part Number: TPS65987DDJ
Other Parts Discussed in Thread: TPS65987, TPS65987D

Hi team,

My customer is looking at using the TPS65987DDJ in a new design and had a few questions.

The application is a USB-C Solid State Drive Dock; I can send the block diagram privately.  There will be two USB-C connectors, one for data and power and the second one for power only.

The Dock will accept NVME SSDs that consume up to 8 Watts and will convert USB 3.1 or Thunderbolt to PCIe Gen 3.

The total power is estimated to be 13.7 Watts. This should work with a USB-C host since it can supply 15 Watts.

But if it is connected to a USB 3.0 host then only 4.5 Watts is available and then power can be supplied through the second USB-C connector from an external power source.

The TPS65987DDJ datasheet mentions that it has ideal diode reverse current protection.

So in the case where VBUS power is coming from both USB-C connectors will it diode OR the power, or can one or the other VBUS inputs be selected?

Can this be controlled from the I2C interface?

 

The datasheet mentions application firmware. I am assuming the firmware is built into the device and that we do not need to develop any firmware. Is that correct?

If they don’t need the BC1.2 support can they leave the USB 2.0 data pins unconnected?

Thank you in advance for your support!

Best regards,

Errol

  • 0
    TI__Mastermind 29765 points

    Hi Errol,

    The TPS65987DDJ is a single port, so is the plan to use 2 of this TPS65987 in the system; one with power and data role (host connection) and the other just power role (external power source connection)? Have they consider using the TPS65988D which has 2 ports? 

    If 2 separate TPS65987D then each PD will have its own PD contract and the sink side (PPHV) will take what's is the contract when connected.

    There is an application GUI for device configuration along with its FW so they don't need to develop any FW.

    The USB2.0 pins can be used as GPIO if they don't need BC1.2.

    Regards,

    Peter