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TMP007AIYZFT データシートの表示(PDF) - Texas Instruments

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TMP007AIYZFT Infrared Thermopile Sensor with Integrated Math Engine TI
Texas Instruments TI
TMP007AIYZFT Datasheet PDF : 55 Pages
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TMP007
SBOS685C – APRIL 2014 – REVISED JULY 2015
8.2.2 Narrow-Range Calibration Example: TOBJ = 33°C to 41°C, Unit vs Common Calibration
2.5 V to 5.5 V
V+
0.1 µF
A3
V+
B3
SCL
10 k
10 k
10 k
B1
ADR1
C1
ADR0
TMP007
C3
SDA
C2
ALERT
Two-Wire
Controller
AGND DGND
A2
A1
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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.
DESIGN PARAMETER
N
Minimum TDIE
Maximum TDIE
Minimum TOBJ
Maximum TOBJ
ε
Field of view
Conversion rate
Table 13. Narrow-Range Requirements
EXAMPLE VALUE
16
25°C
30°C
33°C
41°C
0.95
110°
1 sample/second
COMMENT
Number of devices in calibration set
Minimum expected die temperature
Maximum expected die temperature
Minimum expected objected temperature
Maximum expected object temperature
Object emissivity
Field of view subtended by object
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.
TDIE
25°C
30°C
33°C
X
34°C
X
X
35°C
X
Table 14. Narrow-Range Measurement Values
36°C
X
X
36.5°C
X
37°C
X
X
TOBJ
37.5°C
X
38°C
X
X
38.5°C
X
39°C
X
X
40°C
X
41°C
X
X
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.
40
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