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TMP112 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
TMP112 High-Accuracy, Low-Power, Digital Temperature Sensor With SMBus?/Two-Wire Serial Interface in SOT563 TI
Texas Instruments TI
TMP112 Datasheet PDF : 24 Pages
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TMP112
www.ti.com ......................................................................................................................................................... SBOS473B – MARCH 2009 – REVISED JUNE 2009
EXAMPLE 1: Finding Worst-Case Accuracy From –15°C to +50°C
As an example, if the user is concerned only about the temperature accuracy between –15°C to +50°C, the
worst-case accuracy could be determined by using the two slope calculations of Equation 2 and Equation 4:
AccuracyMAX (-15°C to 25°C) = Accuracy(25°C) + DT ´ Slope1MAX
(2)
AccuracyMAX (-15°C to 25°C) = 0.3°C + (-15°C - 25°C)
-7
m°C
°C
= +0.58°C
(3)
AccuracyMAX (25°C to 50°C) = Accuracy(25°C) + DT ´ Slope2MAX
(4)
AccuracyMAX (25°C to 50°C) = 0.3°C + (50°C - 25°C) ´
5 m°C
°C
= +0.425°C
(5)
The same calculations must be applied to the minimum case:
AccuracyMIN (-15°C to 25°C) = Accuracy(25°C) + DT ´ Slope1MIN
(6)
AccuracyMIN (-15°C to 25°C) = -0.5°C + (-15°C - 25°C)
0
m°C
°C
= -0.5°C
(7)
AccuracyMIN (25°C to 50°C) = Accuracy(25°C) + DT ´ Slope2MIN
(8)
AccuracyMIN (25°C to 50°C) = -0.5°C + (50°C - 25°C)
0
m°C
°C
= -0.5°C
(9)
Based on the above calculations, a user can expect a worst-case accuracy of +0.58°C to –0.5°C in the
temperature range of –15°C to +50°C.
EXAMPLE 2: Finding Worst-Case Accuracy From +25°C to +100°C
If the desired temperature range falls in the region of slope 3, it is necessary to first calculate the worst-case
value from +25°C to +85°C and add it to the change in temperature multiplied by the span error of slope 3. As an
example, consider the temperature range of +25°C to +125°C as shown in Equation 10:
AccuracyMAX (25°C to 100°C) = Accuracy(25°C) + DT ´ Slope2MAX + DT ´ Slope3MAX
(10)
AccuracyMAX (25°C to 100°C) = 0.3°C + (85°C - 25°C)
4.5
m°C
°C
+ (100°C - 85°C) 8 m°C
°C
= +0.690°C
(11)
Performing the same calculation for the minimum case is shown in Equation 12:
AccuracyMIN (25°C to 100°C) = Accuracy(25°C) + DT ´ Slope2MIN + DT ´ Slope3MIN
(12)
AccuracyMIN (25°C to 100°C) = -0.5°C + (85°C - 25°C)
0
m°C
°C
+ (100°C - 85°C) 0 m°C
°C
= -0.5°C
(13)
Copyright © 2009, Texas Instruments Incorporated
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