INA210 datasheet(17/39 Pages) TI1

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Power_LSB=20Current_LSB

Power_LSB=400

-6

Max_Current=Current_LSB

32767

Max_Current=0.65534

Max_ShuntVoltage=Max_Current_Before_Overflow

SHUNT

Max_ShuntVoltage=0.32

MaximumPower=Max_Current_Before_Overflow

BUS_MAX

MaximumPower=20.48

Corrected_Full_Scale_Cal=trunc

Cal

MeasShuntCurrent

INA220_Current

Corrected_Full_Scale_Cal=3548

INA220

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SBOS459D – JUNE 2009 – REVISED SEPTEMBER 2010

6. Calculate the Power LSB, using Equation 5. Equation 5 shows a general formula; because the bus voltage

measurement LSB is always 4mV, the power formula reduces to the calculated result.

(5)

7. Compute the maximum current and shunt voltage values (before overflow), as shown by Equation 6 and

Equation 7. Note that both Equation 6 and Equation 7 involve an If - then condition:

(6)

If Max_Current

≥ Max Possible_I then

Max_Current_Before_Overflow = MaxPossible_I

Else

Max_Current_Before_Overflow = Max_Current

End If

(Note that Max_Current is greater than MaxPossible_I in this example.)

Max_Current_Before_Overflow = 0.64 (Note: This result is displayed by software as seen in Figure 20.)

(7)

If Max_ShuntVoltage

≥ VSHUNT_MAX

Max_ShuntVoltage_Before_Overflow = VSHUNT_MAX

Else

Max_ShuntVoltage_Before_Overflow= Max_ShuntVoltage

End If

(Note that Max_ShuntVoltage is greater than VSHUNT_MAX in this example.)

Max_ShuntVoltage_Before_Overflow = 0.32 (Note: This result is displayed by software as seen in

Figure 20.)

8. Compute the maximum power with Equation 8.

(8)

9. (Optional second Calibration step.) Compute corrected full-scale calibration value based on measured

current.

INA220_Current = 0.63484

MeaShuntCurrent = 0.55

(9)

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