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LMT86QDCKTQ1 Datasheet(PDF) 8 Page - Texas Instruments |
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LMT86QDCKTQ1 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 16 page J A JA DD S DD O L T = T + (V I ) + (V - V ) I T ª º ¬ ¼ (-10.9 mV / oC) u V = T + 2103 mV (-10.9 mV / oC) u V - 1885 mV = (T - 20 oC) 1558 mV - 1885 mV 50 oC - 20oC u ¹ · V - 1885 mV = (T - 20 oC) V2 - V1 T2 - T1 u ¹ · V - V1 = (T - T1) ª º ª º « » « » ¬ ¼ ¬ ¼ 2 TEMP 2 mV mV V mV = 1777.3mV - 10.888 T - 30°C - 0.00347 T - 30°C °C °C LMT86, LMT86-Q1 SNIS169A – MARCH 2013 – REVISED JUNE 2013 www.ti.com Although the LMT86/LMT86-Q1 is very linear, its response does have a slight umbrella parabolic shape. This shape is very accurately reflected in . The Transfer Table can be calculated by using the parabolic equation. (1) For a linear approximation, a line can easily be calculated over the desired temperature range from the Table using the two-point equation: (2) Where V is in mV, T is in °C, T1 and V1 are the coordinates of the lowest temperature, T2 and V2 are the coordinates of the highest temperature. For example, if we want to resolve this equation, over a temperature range of 20°C to 50°C, we would proceed as follows: (3) (4) (5) Using this method of linear approximation, the transfer function can be approximated for one or more temperature ranges of interest. MOUNTING AND THERMAL CONDUCTIVITY The LMT86/LMT86-Q1 can be applied easily in the same way as other integrated-circuit temperature sensors. It can be glued or cemented to a surface. To ensure good thermal conductivity, the backside of the LMT86/LMT86-Q1 die is directly attached to the GND pin (Pin 2). The temperatures of the lands and traces to the other leads of the LMT86/LMT86-Q1 will also affect the temperature reading. Alternatively, the LMT86/LMT86-Q1 can be mounted inside a sealed-end metal tube, and can then be dipped into a bath or screwed into a threaded hole in a tank. As with any IC, the LMT86/LMT86-Q1 and accompanying wiring and circuits must be kept insulated and dry, to avoid leakage and corrosion. This is especially true if the circuit may operate at cold temperatures where condensation can occur. If moisture creates a short circuit from the output to ground or VDD, the output from the LMT86/LMT86-Q1 will not be correct. Printed-circuit coatings are often used to ensure that moisture cannot corrode the leads or circuit traces. The thermal resistance junction to ambient ( θJA) is the parameter used to calculate the rise of a device junction temperature due to its power dissipation. The equation used to calculate the rise in the LMT86/LMT86-Q1 die temperature is: (6) where TA is the ambient temperature, IS is the supply current, IL is the load current on the output, and VO is the output voltage. For example, in an application where TA = 30°C, VDD = 5V, IS = 5.4 µA, VO = 1777 mV junction temp 30.014°C self-heating error of 0.014°C. Since the LMT86/LMT86-Q1's junction temperature is the actual temperature being measured, care should be taken to minimize the load current that the LMT86/LMT86-Q1 is required to drive. Table 2 shows the thermal resistance of the LMT86/LMT86-Q1. Table 2. LMT86/LMT86-Q1 Thermal Resistance DEVICE NUMBER TI PACKAGE NUMBER THERMAL RESISTANCE ( θJA) LMT86DCK DCK0005A 415°C/W 8 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Product Folder Links: LMT86 LMT86-Q1 |
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