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LMT87LPM Datasheet(PDF) 9 Page - Texas Instruments |
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LMT87LPM Datasheet(HTML) 9 Page - Texas Instruments |
9 / 29 page Thermal Diodes OUT VDD GND 9 LMT87, LMT87-Q1 www.ti.com SNIS170D – JANUARY 2014 – REVISED JUNE 2017 Product Folder Links: LMT87 LMT87-Q1 Submit Documentation Feedback Copyright © 2014–2017, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The LMT87 and LMT87-Q1 are analog output temperature sensors. The electrical characteristics of the LMT87 and LMT87-Q1 are identical, so for clarity, the devices will be subsequently referred to as simply LMT87. 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 push-pull output stage thus providing a low impedance output source. 8.2 Functional Block Diagram Full-Range Celsius Temperature Sensor ( −50°C to +150°C) 8.3 Feature Description 8.3.1 LMT87 Transfer Function The output voltage of the LMT87, across the complete operating temperature range, is shown in Table 3. This table is the reference from which the LMT87 accuracy specifications (listed in the Accuracy Characteristics section) are determined. This table can be used, for example, in a host processor look-up table. A file containing this data is available for download at the LMT87 product folder under Tools and Software Models. Table 3. LMT87 Transfer Table TEMP (°C) VOUT (mV) TEMP (°C) VOUT (mV) TEMP (°C) VOUT (mV) TEMP (°C) VOUT (mV) TEMP (°C) VOUT (mV) -50 3277 -10 2767 30 2231 70 1679 110 1115 -49 3266 -9 2754 31 2217 71 1665 111 1101 -48 3254 -8 2740 32 2204 72 1651 112 1087 -47 3243 -7 2727 33 2190 73 1637 113 1073 -46 3232 -6 2714 34 2176 74 1623 114 1058 -45 3221 -5 2700 35 2163 75 1609 115 1044 -44 3210 -4 2687 36 2149 76 1595 116 1030 -43 3199 -3 2674 37 2136 77 1581 117 1015 -42 3186 -2 2660 38 2122 78 1567 118 1001 -41 3173 -1 2647 39 2108 79 1553 119 987 -40 3160 0 2633 40 2095 80 1539 120 973 -39 3147 1 2620 41 2081 81 1525 121 958 -38 3134 2 2607 42 2067 82 1511 122 944 |
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