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TMP006 bảng dữ liệu(PDF) 11 Page - Texas Instruments

tên linh kiện TMP006
Giải thích chi tiết về linh kiện  TMP006/B Infrared Thermopile Sensor in Chip-Scale Package
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TMP006 bảng dữ liệu(HTML) 11 Page - Texas Instruments

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N
SENSOR
X
X 1
1
V
Sensor Conversion
N
=
=
å
N
DIE
X
X 1
1
T
Local Temp Conversion
N
=
=
å
OUT
SENSOR
HOT
COLD
OBJ
DIE
V
V
C (T
T
)
(T
4
T
4)
=
=
´
-
µ
-
Thermopile
Heat Absorbor
Cold Junction
Thot
Tcold
Thot
Thot
Thot
EHOT ß TDIE
4
EOBJ ß TOBJ
4
+
TMP006, TMP006B
www.ti.com
SBOS518E – MAY 2011 – REVISED APRIL 2015
Feature Description (continued)
8.3.3 Thermopile Principles and Operation
The TMP006 and TMP006B sense radiation by absorbing the radiation on a hot junction. The thermopile then
generates a voltage proportional to the temperature difference between the hot junction, Thot, and the cold
junction, Tcold.
Figure 9. Principle of Thermopile Operation
The cold junction is thermally grounded to the die, and is effectively TDIE, the die temperature. In thermal
equilibrium, the hot junction is determined by the object temperature, TOBJ. The energy emitted by the object,
EOBJ, minus the energy radiated by the die, EDIE, determines the temperature of the hot junction. The output
voltage, VOUT, is therefore determined by the relationship shown in Equation 2:
where
C is a constant depending on the design of the sensing element.
(2)
Note that the sensor voltage is related to both the object temperature and the die temperature. A fundamental
characteristic of all thermopiles is that they measure temperature differentials, not absolute temperatures. The
TMP006 and TMP006B contain a highly-accurate, internal temperature sensing element to measure TDIE.
Estimate TOBJ by using VSENSOR and TDIE. For each 250-ms conversion cycle, the TMP006 and TMP006B
measure a value for VSENSOR and for TDIE, which are then placed in their respective registers.
For each conversion cycle, the device generates an analog-to-digital converter (ADC) value for TDIE and VSENSOR.
Bits CR2 to CR0 determine the number of TDIE and sensor ADC results to average before they are loaded into
the respective registers for readout.
After power-on reset (POR), the TMP006 and TMP006B start in four conversions per second (CR[2:0] = 010). In
general, for a mode with N conversions, the local temperature, TDIE, result is updated at the end of the Nth ADC
conversion with the value shown in Equation 3:
(3)
Similarly, the sensor voltage result is updated at the end of the Nth sensor ADC conversion with the value shown
in Equation 4:
(4)
The total conversion time and averages per conversion can be optimized to select the best combination of
update rate versus noise for an application. Additionally, low-power conversion mode is available. In CR settings
101, 110, and 111, the device inserts a standby time before the beginning of the next conversion or conversions.
The method and requirements for estimating TOBJ are described in the next section.
Copyright © 2011–2015, Texas Instruments Incorporated
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