TMP112 datasheet(31/46 Pages) TI2

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8.1.2 Using The Slope Specifications With a 1-Point Calibration (TMP112-Q1 Only)

The initial accuracy assurance at 25°C with the slope regions provides an accuracy that is high enough for most

applications. However, if higher accuracy is desired, this increase can be achieved with a 1-point calibration

at 25°C. This calibration removes the offset at room temperature, thereby reducing the source of error in a

TMP112-Q1 temperature reading down to the curvature. Figure 8-2 shows the error of a calibrated TMP112-Q1

device.

0.8

0.6

0.4

0.2

-0.2

0.4

0.6

Temperature ( C)

Slope1

MAX

Slope2

MAX

Slope3

MAX

Calibration at 25°C Removes Offset

-40

-20

130

100 110 120

80 90

20 30

-30

-10

Figure 8-2. Calibrated Accuracy and Slope Curves Versus Temperature

Using the previous example temperature range of 0°C to 50°C, the worst-case temperature error is now reduced

to the worst-case slopes because the offset at 25°C (that is, the maximum and minimum temperature errors of

0.3°C and –0.5°C) is removed. Therefore, a user can expect the worst-case accuracy to improve to 0.175°C.

8.1.2.1 Power Supply-Level Contribution to Accuracy

The accuracy that can be achieved with the TMP112-Q1 device is complemented by the immunity-to-DC

variations from a 3.3V supply voltage. This immunity is important because the immunity spares the user from

having to use another LDO regulator to produce 3.3V to achieve accuracy. Nevertheless, the noise quantization

that results from changing supply can add some slight change in temperature measurement accuracy. As an

example, if the user chooses to operate the device at 1.8V, the worst-case expected change in accuracy can be

calculated with Equation 14:

AccuracyPSR =± V+−3.3V × 0.25℃V

(14)

AccuracyPSR =± 1.8V−3.3V × 0.25℃V =±0.375℃

(15)

This example is a worst-case accuracy contribution as a result of variation in power supply that must be added to

the accuracy plus the slope maximum.

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TMP112-Q1, TMP112D-Q1

SLOS887G – SEPTEMBER 2014 – REVISED MAY 2025

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