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LMT85 Datasheet(PDF) 10 Page - Texas Instruments |
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LMT85 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 26 page  (-8.20 mV / oC) u V = T + 1569 mV (-8.20 mV / oC) u V - 1405 mV = (T - 20 oC) 1159 mV - 1405 mV 50 oC - 20oC u ¹ · V - 1405 mV = (T - 20 oC) V2 - V1 T2 - T1 u ¹ · V - V1 = (T - T1) 30 00262 . 0 2 mV V 1324 00262 . 0 4 194 . 8 194 . 8 T TEMP 2 u u u ª º ª º « » « » ¬ ¼ ¬ ¼ 2 TEMP 2 mV mV V mV = 1324.0mV - 8.194 T - 30°C - 0.00262 T - 30°C °C °C LMT85, LMT85-Q1 SNIS168C – MARCH 2013 – REVISED OCTOBER 2015 www.ti.com Feature Description (continued) Table 1. LMT85/LMT85-Q1 Transfer Table (continued) TEMP VOUT TEMP VOUT TEMP VOUT TEMP VOUT TEMP VOUT (°C) (mV) (°C) (mV) (°C) (mV) (°C) (mV) (°C) (mV) -32 1822 8 1502 48 1176 88 839 128 495 -31 1814 9 1494 49 1167 89 831 129 487 -30 1806 10 1486 50 1159 90 822 130 478 -29 1798 11 1478 51 1151 91 814 131 469 -28 1790 12 1470 52 1143 92 805 132 460 -27 1783 13 1462 53 1134 93 797 133 452 -26 1775 14 1454 54 1126 94 788 134 443 -25 1767 15 1446 55 1118 95 779 135 434 -24 1759 16 1438 56 1109 96 771 136 425 -23 1751 17 1430 57 1101 97 762 137 416 -22 1743 18 1421 58 1093 98 754 138 408 -21 1735 19 1413 59 1084 99 745 139 399 -20 1727 20 1405 60 1076 100 737 140 390 -19 1719 21 1397 61 1067 101 728 141 381 -18 1711 22 1389 62 1059 102 720 142 372 -17 1703 23 1381 63 1051 103 711 143 363 -16 1695 24 1373 64 1042 104 702 144 354 -15 1687 25 1365 65 1034 105 694 145 346 -14 1679 26 1356 66 1025 106 685 146 337 -13 1671 27 1348 67 1017 107 677 147 328 -12 1663 28 1340 68 1008 108 668 148 319 -11 1656 29 1332 69 1000 109 660 149 310 150 301 Although the LMT85/LMT85-Q1 is very linear, its response does have a slight umbrella parabolic shape. This shape is very accurately reflected in Table 1. The Transfer Table can be calculated by using the parabolic equation. (1) The parabolic equation is an approximation of the transfer table and the accuracy of the equation degrades slightly at the temperature range extremes. Equation 1 can be solved for T resulting in: (2) For an even less accurate linear transfer function approximation, a line can easily be calculated over the desired temperature range using values from the Table and a two-point equation: (3) 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: (4) (5) (6) 10 Submit Documentation Feedback Copyright © 2013–2015, Texas Instruments Incorporated |
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