Datasheet

Cal=trunc
0.04096
Current_LSB R´
SHUNT
Cal=4096
Power_LSB=20 Current_LSB´
Power_LSB=400 10´
-6
Max_Current=Current_LSB 32767´
Max_Current=0.65534
TPS2480
TPS2481
SLUS939B –APRIL 2010–REVISED DECEMBER 2010 www.ti.com
5. Compute the Calibration Register value using Equation 33:
(33)
6. Calculate the Power LSB, using Equation 34. Equation 34 shows a general formula; because the bus voltage
measurement LSB is always 4 mV, the power formula reduces to the calculated result.
(34)
7. Compute the maximum current and shunt voltage values (before overflow), as shown by Equation 35 and
Equation 36. Note that both Equation 35 and Equation 36 involve an If - then condition:
(35)
If Max_Current ≥ Max Possible_I then
Max_Current_Before_Overflow = MaxPossible_I
Else
Max_Current_Before_Overflow = Max_Current
End If
NOTE
(Max_Current is greater than MaxPossible_I in this example.)
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