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LM20CIM7 bảng dữ liệu(PDF) 8 Page - Texas Instruments |
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LM20CIM7 bảng dữ liệu(HTML) 8 Page - Texas Instruments |
8 / 25 page Thermal Diodes VO V + GND LM20 SNIS106Q – DECEMBER 1999 – REVISED JANUARY 2015 www.ti.com 7 Detailed Description 7.1 Overview The LM20 device is a precision analog output CMOS integrated-circuit temperature sensor that operates over a temperature range of −55°C to 130°C. The power supply operating range is 2.4 V to 5.5 V. The transfer function of LM20 is predominately linear, yet has a slight predictable parabolic curvature. The accuracy of the LM20 when specified to a parabolic transfer function is typically ±1.5°C at an ambient temperature of 30°C. The temperature error increases linearly and reaches a maximum of ±2.5°C at the temperature range extremes for the LM20. The temperature range is affected by the power supply voltage. At a power supply voltage of 2.7 V to 5.5 V, the temperature range extremes are 130°C and −55°C. Decreasing the power supply voltage to 2.4 V changes the negative extreme to −30°C, while the positive remains at 130°C. The LM20 quiescent current is less than 10 μA. Therefore, self-heating is less than 0.02°C in still air. Shutdown capability for the LM20 is intrinsic because its inherent low power consumption allows it to be powered directly from the output of many logic gates or, does not necessitate shutdown at all. The temperature sensing element is comprised of a simple base emitter junction that is forward biased by a current source. The temperature sensing element is then buffered by an amplifier and provided to the OUT pin. The amplifier has a simple class A output stage thus providing a low impedance output that can source 16 µA and sink 1 µA. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 LM20 Transfer Function The LM20 transfer function can be described in different ways with varying levels of precision. A simple linear transfer function with good accuracy near 25°C is: VO = −11.69 mV/°C × T + 1.8663 V (1) Over the full operating temperature range of −55°C to 130°C, best accuracy can be obtained by using the parabolic transfer function. VO = (−3.88×10 −6×T2) + (−1.15×10−2×T) + 1.8639 (2) Using Equation 2, the following temperature to voltage output characteristic table can be generated. Table 1. Temperature to Voltage Output Characteristic Table TEMP VOUT TEMP VOUT TEMP VOUT TEMP VOUT TEMP VOUT TEMP VOUT TEMP VOUT (°C) (V) (°C) (V) (°C) (V) (°C) (V) (°C) (V) (°C) (V) (°C) (V) -55 2.4847 -28 2.1829 -1 1.8754 26 1.5623 53 1.2435 80 0.9191 107 0.5890 -54 2.4736 -27 2.1716 0 1.8639 27 1.5506 54 1.2316 81 0.9069 108 0.5766 -53 2.4625 -26 2.1603 1 1.8524 28 1.5389 55 1.2197 82 0.8948 109 0.5643 -52 2.4514 -25 2.1490 2 1.8409 29 1.5271 56 1.2077 83 0.8827 110 0.5520 -51 2.4403 -24 2.1377 3 1.8294 30 1.5154 57 1.1958 84 0.8705 111 0.5396 -50 2.4292 -23 2.1263 4 1.8178 31 1.5037 58 1.1838 85 0.8584 112 0.5272 8 Submit Documentation Feedback Copyright © 1999–2015, Texas Instruments Incorporated Product Folder Links: LM20 |
Số phần tương tự - LM20CIM7 |
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Mô tả tương tự - LM20CIM7 |
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