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CCS/UCD3138PSFBEVM-027: UCD3138:How to calculate POUT_ SCALER？

Yue Chang
Prodigy 60 points
Part Number: UCD3138PSFBEVM-027

Tool/software: Code Composer Studio

Hello experts ,

In PSFBFirmware-1.1 programme,  I find that   POUT_SCALER    equal   14850.

system_define.h

#define POUT_SCALER  (14850) 

 I can't understand why POUT_SCALER is set.Thanks for your great support.

  • 0
    TI__Genius 14580 points

    Hi, Yue Chang,

    POUT_SCALER is a factor to change an engineering unit to what the device register can accept. It is the similar to other scalers, like VIN_SCALER. 

    Regards,
    Sean

  • 0 in reply to Sean Xu
    Prodigy 60 points

    Hi, Sean,

          Can you tell me how to get this value? Thanks for your great support.

  • 0 in reply to Sean Xu
    TI__Genius 14580 points

    Hello, Yue,

    pmbus_dcdc_config[0].cpcc_pmax =360W;

    pmbus_dcdc_config_translated[0].cpcc_pmax = (linear11_translation(pmbus_dcdc_config[0].cpcc_pmax, 0) * POUT_SCALER);

    Use the pmbus_dcdc_config_translated[0].cpcc_pmax to calculate the LoopMuxRegs.CPNOM.bit.NOM_CURRENT_LOWER through the below equation: 

    LoopMuxRegs.CPNOM.bit.NOM_CURRENT_LOWER = pmbus_dcdc_config_translated[0].cpcc_pmax / (pmbus_dcdc_config_translated[0].vout_cmd >> 4);

    pmbus_dcdc_config_translated[0].vout_cmd is voltage setting point.

    You can track the registers and see what value you have. It can be reverse the path and get the POU_SCALER.

    I hope it helps,
    Sean