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TIDA-01606: SDFM current sensing scale factor calculation

Part Number: TIDA-01606


I tried to calculate the scale factor for SDFM current sensing of TIDA-01606. I did the following:

1. Vclipping = 0.064V

2. CodeWorde(peak) in 32 bit format =2147483648 

4. Rshunt=0.003 ohm

Scale Factor = 0.064 / (2147483648  * 0.003)

However, the calculated Scale Factor gives the wrong current measurement in DSP.  I experimentally calculated the scale factor and from my calculation, CodeWorde(peak) should be 964135.3. I am wondering what is wrong with my calculations.

Moreover in TI code, the scale factor is defined 1/OSR^3. I would be great full if you could also explain about TI scale factor.