AM2432: Sigma Delta Current Calculation Formula

Tool/software:

Hi TI Experts,

Customer is working on AM2431 SDK9.2.

They want to know the formula of sigma delta current calculation.

They have found the following formula in the single_drive project. However, they do not know what does the number "30" stands for? Could you help explain this for customer please?

fdbkCurPhB = (-((float)gSddfChSamps[1] - gSddfChOffsets[1] - SDDF_HALF_SCALE_FLT) / SDDF_HALF_SCALE_FLT) * 30.0;
fdbkCurPhA = -fdbkCurPhB - ((-((float)gSddfChSamps[2] - gSddfChOffsets[2] - SDDF_HALF_SCALE_FLT) / SDDF_HALF_SCALE_FLT) * 30.0);

Another thing is that their sampling chip changes to AMC1306M25 with 15 mOhms. They want to know that how could we modify the above formula to adapt this new sampling chip?

Thanks,

Kevin