TMP007 datasheet(42/55 Pages) TI

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-1.00

-0.75

-0.50

-0.25

0.00

0.25

0.50

0.75

1.00

Object Temperature (

SC)

25°C-1 s

25°C-4 s

30°C-1 s

30°C-4 s

C017

-2.0

-1.5

-1.0

-0.5

0.0

0.5

1.0

1.5

2.0

Object Temperature (

SC)

25°C-U

25°C-C

30°C-U

30°C-C

C015

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0.50

Object Temperature (

SC)

C-1 s

U-1 s

U-4 s

C016

Accuracy

Mean Calibration Error

3 Standard Deviations

TMP007

SBOS685C – APRIL 2014 – REVISED JULY 2015

www.ti.com

Note that calibration does not affect the temporal random noise observed, as shown in Figure 55. The standard

deviation of the temperature error is independent of the calibration if the random error is dominated by the sensor

noise and not external system factors, such as convection and conduction. For common calibration, the total

standard deviation increases because of the effects of device-to-device variation. This standard deviation is

calculated in the usual way, by substituting TOBJ_PREDICT for the mean in the standard deviation formula.

The accuracy is then defined as the mean calibration error plus the random errors from all sources. For this

example application, use the criteria shown in Equation 14:

(18)

The resulting accuracy over TOBJ and TDIE is shown in Figure 57 for the unit- and common-calibration

approaches. Clearly, the unit calibration results in higher accuracy, though common calibration is applicable for

many application requirements.

Reduce the random temporal error by increasing the sample time. Figure 58 shows the effects of increasing the

sample time on the standard deviation. As a result of device-to-device variation, the effects of increased sample

time on the common-calibration scheme is negligible; however, an improvement is seen for the unit calibration

scheme.

Finally, the resulting accuracy is shown for the different sample times as a function of TDIE in Figure 59. Improve

the accuracy by generating separate coefficient sets for TDIE = 25°C and TDIE = 30°C.

8.2.2.3 Application Curves

Figure 57. Mean Error with Unit and Common Calibration,

Figure 58. RMS Temperature Error vs Conversion Rate

Narrow Range Over TDIE

Figure 59. Accuracy vs Conversion Rate (Unit Calibration)

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