Accuracy

=Acc

+ T

Slope

D ´

(worst-case)

25°C)

uracy

(

0.8

0.6

0.4

0.2

0

0.2

0.4

0.6

-

-

-

Temperature( C)

°

-40

-20

0

20

40

60

130

Slope1

MAX

Slope1

MIN

Slope2

MAX

Slope2

MIN

Slope3

MIN

100 110 120

80 90

70

50

30

10

-30

-10

Slope3

MAX

TMP112-Q1

www.ti.com

SLOS887D – SEPTEMBER 2014 – REVISED DECEMBER 2015

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

8.1.1 Calibrating for Improved Accuracy

Many temperature monitoring applications require better than 0.5°C accuracy over a limited temperature range.

Knowing the offset of a temperature sensor at a given temperature in conjunction with the average temperature

span (slope) error over a fixed range makes achieving this improved accuracy possible.

The TMP112-Q1 device has three distinct slope regions that conservatively approximate the inherent curvature.

The following lists the three distinct slope regions:

1. Slope1 applies over –40°C to 25°C

2. Slope2 applies over 25°C to 85°C

3. Slope3 applies over 85°C to 125°C

The Specifications for User-Calibrated Systems table defines these slopes which are also shown in Figure 17.

NOTE

Each slope listed in the Specifications for User-Calibrated Systems table is increasing with

respect to 25°C.

Figure 17. Accuracy and Slope Curves versus Temperature

Use Equation 1 to calculate the worst-case accuracy at a specific temperature.

(1)

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