TMP512 datasheet(27/62 Pages) TI2

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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

TMP513_Current

Corrected_Full_Scale_Cal=3548

TMP512

TMP513

www.ti.com

SBOS491A

– JUNE 2010 – REVISED MAY 2011

6. Calculate the Power LSB with Equation 10. Equation 10 shows a general formula; because the bus voltage

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

(10)

7. Compute the maximum current and shunt voltage values (before overflow), as shown by Equation 11 and

Equation 12. Note that both Equation 11 and Equation 12 involve an If - then condition:

(11)

If Max_Current

≥ MaxPossible_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

(12)

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

8. Compute the maximum power with Equation 13.

(13)

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

current.

TMP513_Current = 0.63484

MeaShuntCurrent = 0.55

(14)

Figure 32 illustrates how to perform the same procedure discussed in this example using the automated

TMP512/13EVM software. Note that the same numbers used in this nine-step example are used in the software

example. Note also that Figure 32 illustrates which results correspond to which step (for example, the information

entered in Step 1 is enclosed in a box in Figure 32 and labeled).

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