PDF LM57 Data sheet ( Hoja de datos )

Número de pieza	LM57
Descripción	Resistor-Programmable Temperature Switch And Analog Temperature Sensor
Fabricantes	National Semiconductor Corporation
Logotipo
Hay una vista previa y un enlace de descarga de LM57 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas
No Preview Available ! LM57 February 9, 2010 Resistor-Programmable Temperature Switch and Analog Temperature Sensor General Description The LM57 is a precision, dual-output, temperature switch with integrated analog temperature sensor. The trip temperature (TTRIP) is programmable by using two external 1% resistors. Using extremely small packaged resistors (0.5 mm x 1 mm), the LM57 can be programmed to any of 256 trip temperatures while consuming very little board space. The VTEMP output delivers an analog output voltage which is proportional with a negative temperature coefficient (NTC) to the measured tem- perature. Built-in temperature hysteresis (THYST) keeps the output sta- ble in an environment of thermal oscillation. The digital tem- perature switch outputs will go active when the die tempera- ture exceeds TTRIP and will release when the temperature falls below a temperature equal to TTRIP minus THYST. One of the digital outputs, TOVER, is active-high with a push-pull structure. The other digital output, TOVER, is active-low with an open- drain structure. Driving the TRIP-TEST input high will make the digital outputs active. A processor can read the logic level of the temperature switch outputs, confirming that they changed to their active state. This allows for in-situ verification that the comparator and output circuitry are functional after system assembly. When the TRIP-TEST pin is high, the trip-level reference volt- age appears at the Vtemp pin. The system could then use this voltage to calibrate the sensor for even tighter accuracy. Ty- ing TOVER to TRIP-TEST will latch the output after it trips. It can be cleared by forcing TRIP-TEST low or powering off the LM57. As it draws only 28µA max from its supply, it has very low self- heating, about 0.02°C in still air. Applications ■ Cell phones ■ Wireless transceivers ■ Digital cameras ■ Personal digital assistants (PDA's) ■ Battery management ■ Automotive ■ Disk drives ■ Games ■ Appliances Features ■ Trip temperature set by external resistors ■ External resistor tolerance contributes zero error ■ Push-pull and open-drain temperature switch outputs ■ Wide operating temperature and trip-temperature range of −50°C to 150°C ■ Very linear analog VTEMP temperature sensor output ■ Analog and digital outputs are short-circuit protected ■ TRIP-TEST pin allows in-system testing ■ Latching function for the digital outputs ■ Very small 2.5 mm by 2.5 mm 8-Pin LLP package Key Specifications ■ Supply voltage ■ Supply current ■ Temperature switch accuracy ■ Analog (VTEMP) Accuracy ■ Operating temperature ■ Hysteresis magnitude 2.4V to 5.5V 24 μA (typ) ±1.5°C ±0.7°C −50°C to 150°C 5°C, 10°C Connection Diagram Typical Application 8 – Pin LLP Top View 30080501 © 2010 National Semiconductor Corporation 300805 30080502 FIGURE 1. Over-Temperature Output to Microcontroller Digital Input www.national.com 1 page Absolute Maximum Ratings (Note 1) Supply Voltage −0.3V to 6V Voltage at TOVER Voltage at TOVER , VTEMP, TRIP-TEST, RSENSE1, and RSENSE2 Current at any pin −0.3V to 6V −0.3V to (VDD + 0.3V) 5 mA Storage Temperature Range −65°C to 150°C ESD Susceptibility (Note 2) Human Body Model 5500V Machine Model 450V Charged Device Model 1250V Soldering process must comply with National's Reflow Temperature Profile specifications. Refer to www.national.com/ packaging. (Note 3) Operating Ratings (Note 1) Specified Temperature Range Supply Voltage Range −50°C to 150°C +2.4 V to 5.5V Accuracy Characteristics There are four gains corresponding to each of the four Temperature Trip Point Ranges. J2 is the sensor gain used for Temperature Trip Point −41°C to 51.8°C. J3 is for Trip Points 52°C to 97°C. J4 for 97°C to 119°C. J5 for 119°C to 150°C. Trip Point Accuracy Parameter Trip Point Accuracy (Includes 1% set-resistor tolerance) (Note 9) Condition J2 TA = −41°C to 52°C J3 TA = 52°C to 97°C J4 TA = 97°C to 119°C J5 TA = 119°C to 150°C VDD = 2.4V to 5.5V VDD = 2.4V to 5.5V VDD = 2.4V to 5.5V VDD = 2.4V to 5.5V LM57B ±1.5 ±1.5 ±1.5 ±1.5 LM57C ±2.3 ±2.3 ±2.3 ±2.3 Units (M ax) °C °C °C °C VTEMP Analog Temperature Sensor Output Accuracy These limits do not include DC load regulation. These stated accuracy limits are with reference to the values in the LM57 VTEMP Temperature-to-Voltage Table. Parameter Condition LM57B LM57C Units (Max) J2 TA = −50°C to 150°C J3 TA = −50°C to 150°C VTEMP Accuracy (These stated accuracy limits are TA = 20°C to 50°C J4 TA = 0°C to 150°C with reference to the values in the TA = −50°C to 0°C LM57 Temperature-to-Voltage Table) (Note 9) TA = 60°C to 150°C J5 TA = 20°C to 50°C TA = 0°C to 150°C TA = −50°C to 0°C VDD = 2.4V to 5.5V VDD = 2.4V to 5.5V VDD = 2.4V to 5.5V VDD = 2.7V to 5.5V VDD = 3.1V to 5.5V VDD = 2.4V to 5.5V VDD = 2.9V to 5.5V VDD = 3.2V to 5.5V VDD = 4.0V to 5.5V ±0.95 ±0.8 ±0.7 ±0.7 ±0.8 ±0.7 ±0.7 ±0.7 ±0.8 ±1.3 ±1.3 ±1.3 ±1.3 ±1.3 ±1.3 ±1.3 ±1.3 ±1.3 °C °C °C °C 5 www.national.com 5 Page Temperature (°C) 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 J2 979 973 968 963 958 953 948 942 937 932 927 922 917 911 906 901 896 891 885 880 875 870 865 859 854 849 844 839 833 828 823 818 812 807 802 797 791 786 781 776 770 765 760 755 749 744 739 734 VTEMP (mV) J3 J4 1467 1460 1452 1444 1436 1429 1421 1413 1405 1398 1390 1382 1374 1367 1359 1351 1343 1335 1328 1320 1312 1304 1296 1289 1281 1273 1265 1257 1249 1242 1234 1226 1218 1210 1202 1194 1187 1179 1171 1163 1155 1147 1139 1131 1124 1116 1108 1100 1956 1946 1936 1925 1915 1905 1894 1884 1874 1863 1853 1843 1832 1822 1811 1801 1791 1780 1770 1759 1749 1739 1728 1718 1707 1697 1687 1676 1666 1655 1645 1634 1624 1613 1603 1592 1582 1571 1561 1550 1540 1529 1519 1508 1498 1487 1477 1466 J5 2445 2432 2419 2406 2394 2381 2368 2355 2342 2329 2316 2303.0 2290 2277 2264 2251 2238 2225 2212 2199 2186 2173 2160 2147 2134 2121 2108 2095 2082 2069 2056 2043 2030 2016 2003 1990 1977 1964 1951 1938 1925 1911 1898 1885 1872 1859 1846 1833 Temperature (°C) 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 J2 728 723 718 713 707 702 697 691 686 681 675 670 665 660 654 649 644 638 633 628 622 617 612 606 601 596 590 585 580 574 569 564 558 553 548 542 537 531 526 521 515 510 505 499 494 488 483 478 VTEMP (mV) J3 J4 1092 1084 1076 1068 1060 1052 1044 1036 1028 1021 1013 1005 997 989 981 973 965 957 949 941 933 925 917 909 901 893 885 877 869 861 853 845 837 829 821 813 805 797 788 780 772 764 756 748 740 732 724 716 1456 1445 1435 1424 1413 1403 1392 1382 1371 1360 1350 1339 1329 1318 1307 1297 1286 1276 1265 1254 1244 1233 1222 1212 1201 1190 1180 1169 1158 1148 1137 1126 1115 1105 1094 1083 1073 1062 1051 1040 1030 1019 1008 997 986 976 965 954 J5 1819 1806 1793 1780 1767 1753 1740 1727 1714 1700 1687 1674 1661 1647 1634 1621 1607 1594 1581 1568 1554 1541 1528 1514 1501 1488 1474 1461 1448 1434 1421 1407 1394 1381 1367 1354 1340 1327 1314 1300 1287 1273 1260 1246 1233 1219 1206 1192 11 www.national.com 11 Page

Páginas	Total 21 Páginas
PDF Descargar	[ Datasheet LM57.PDF ]

Hoja de datos destacado

Número de pieza	Descripción	Fabricantes
LM50	SOT-23 Single-Supply Centigrade Temperature Sensor	National Semiconductor
LM50	LM50 SOT-23 Single-Supply Centigrade Temperature Sensor (Rev. E)	Texas Instruments
LM50	Diode (spec sheet)	American Microsemiconductor
LM5000	High Voltage Switch Mode Regulator	National Semiconductor

Número de pieza	Descripción	Fabricantes
SLA6805M	High Voltage 3 phase Motor Driver IC.	Sanken
SDC1742	12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.	Analog Devices

DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.

DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar