TMP007 datasheet(40/55 Pages) TI

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ADR1

SCL

SDA

AGND

V+

ALERT

Two-Wire

Controller

TMP007

2.5 V to 5.5 V

0.1 µF

ADR0

DGND

10 k

V+

TMP007

SBOS685C – APRIL 2014 – REVISED JULY 2015

www.ti.com

8.2.2 Narrow-Range Calibration Example: TOBJ = 33°C to 41°C, Unit vs Common Calibration

Figure 56. Typical Application Circuit

8.2.2.1 Design Requirements

For this application, the system must operate over the environment described in Table 13.

Table 13. Narrow-Range Requirements

DESIGN PARAMETER

EXAMPLE VALUE

COMMENT

Number of devices in calibration set

Minimum TDIE

25°C

Minimum expected die temperature

Maximum TDIE

30°C

Maximum expected die temperature

Minimum TOBJ

33°C

Minimum expected objected temperature

Maximum TOBJ

41°C

Maximum expected object temperature

0.95

Object emissivity

Field of view

110°

Field of view subtended by object

Conversion rate

1 sample/second

Select a set of values for TDIE and TOBJ to generate the calibration set. At a minimum, include the four extreme

points of the temperature ranges desired. In practice, it is best to include a number of intermediate points as well.

This example uses the values shown in Table 14, with an X marking the values chosen for measurement. In this

application, the calibration set is weighted more densely around the region of interest.

Table 14. Narrow-Range Measurement Values

TOBJ

TDIE

33°C

34°C

35°C

36°C

36.5°C

37°C

37.5°C

38°C

38.5°C

39°C

40°C

41°C

25°C

30°C

8.2.2.2 Detailed Design Procedure

Before attempting to calibrate the system, it is necessary to establish the stability of the system. Noise is a

measure of precision, which is the random deviation from the mean of the distribution. For a Gaussian (or

normal) distribution, the precision is typically characterized by the standard deviation (sensor noise),

σ.

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