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Power supply options

Paul Bayton
Prodigy 60 points
Other Parts Discussed in Thread: UCD9222

The TSM320C6657 EVM has a compex PMBUS and VID controlled supply.

The PMBUS is connected to the FPGA which presumably programs it on power-up.

Is there any way to program it with default values using the fusion software and then store that in EPROM using the STORE_DEFAULT_ALL command,

alternatively are there any DC/DC converter modules with PMBUS and VID input that one could program up before fitting it to the board.

Would the default configuration of the UCD9222 cause excessive voltages or incorrect sequencing to occur ?

Could a jumper or DIP switch be used to disable the UCD9222 outputs prior to programming.

Finally, what would be the result of operating the VDDC at a fixed (non VID controlled) voltage ?

  • 0
    TI__Mastermind 46460 points

    Paul,

    The C6657 EVM does not have any PMBUS control from the FPGA on power up.  The EVM Technical Reference Document explains the contents of the FPGA.  Smart Reflex power control is solely through the DSP's VCNTL interface to the VID inputs of the UCD9222.

    The UCD9222 has a non-volatile memory.  It can be programmed by a distributor prior to board assembly.  Alternately, it can be programmed through the PMBUS header during board bring-up as part of the production flow.

    The power supplies to the DSPs must never exceed the maximum rated voltages listed in the Data Manual.  The power supply provision process nust never allow these limited to be exceeded.  Damage to the DSP may result.

    The UCD9222 has the EN1 and EN2 inputs that can be used for power sequencing.  These can be used to prevent power conversion prior to proper programming.  The PMBUS CNTRL pin is also used to prevent power conversion until after programming.

    The default configuration within the UCD9222 does not output ant voltage.  It must be programmed before it will initialte power conversion.

    The C6657 is not approved for operation at a fixed CVDD supply voltage.  A Smart Reflex supply solution must be used.

    Tom