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TPSM8D6C24: PMBus lines in dual phase operation

Russell Wetherley1
Expert 4255 points
Part Number: TPSM8D6C24

Hello E2E,

I’m using TPSM8D6C24 in a dual-phase operation to power the core rail for an FPGA/processor. This controller has “SVID” (SmartVID) to throttle the voltage and increase efficiencies. It requires a standard PMBUS interface which TPSM8D6C24 provides.

However, I’d also like to have external monitoring of some of the telemetry and status of the TPSM8D6C24. The device has two PMBUS interfaces (one for each channel) but I’m connecting the channels together in a dual-phase configuration. This brings me to my question:

If I connect the channel A PMBUS to the controller's SVID pins, can I use channel B’s PMBUS to monitor status and/or telemetry in a dual-phase configuration?

Thanks!

Russell

  • 0
    TI__Guru 51555 points

     

    No.

    When configured as a follower device (GOSNS_x pulled to BP1V5x) the TPSM8D6C24 does not respond to the PMBus pins.  To read telemetry out of the TPSM8D6C24 device, you will need to connect the second PMBus controller to the same PMBus lines as the VID device and ensure both the VID device and the telemetry collecting device support multi-controller interfaces to avoid transaction collisions.

    Also, you do not need to connect the PMBus pins of the two channels together, the channel with it's GOSNS_X pin pulled to BP1V5 can have it's PMBus pins tied off to GND or left floating, the pins are ignored.