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LM20SITLX Folha de dados(PDF) 1 Page - National Semiconductor (TI) |
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LM20SITLX Folha de dados(HTML) 1 Page - National Semiconductor (TI) |
1 / 10 page LM20 2.4V, 10µA, SC70, micro SMD Temperature Sensor General Description The LM20 is a precision analog output CMOS integrated- circuit temperature sensor that operates over a −55˚C to +130˚C temperature range. 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 ±1.5˚C at an ambient tempera- ture of +30˚C. The temperature error increases linearly and reaches a maximum of ±2.5˚C at the temperature range extremes. 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’s quiescent current is less than 10 µA. Therefore, self-heating is less than 0.02˚C in still air. Shutdown capa- bility 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. Applications n Cellular Phones n Computers n Power Supply Modules n Battery Management n FAX Machines n Printers n HVAC n Disk Drives n Appliances Features n Rated for full −55˚C to +130˚C range n Available in an SC70 and 2 micro SMD packages n Predictable curvature error n Suitable for remote applications Key Specifications j Accuracy at +30˚C ±1.5 to ±4 ˚C (max) j Accuracy at +130˚C & −55˚C ±2.5 to ±5 ˚C (max) j Power Supply Voltage Range +2.4V to +5.5V j Current Drain 10 µA (max) j Nonlinearity ±0.4 % (typ) j Output Impedance 160 Ω (max) j Load Regulation 0µA < I L< +16 µA −2.5 mV (max) Typical Application Full-Range Celsius (Centigrade) Temperature Sensor (−55˚C to +130˚C) Operating from a Single Li-Ion Battery Cell Output Voltage vs Temperature 10090802 V O = (−3.88x10 −6xT2) + (−1.15x10−2xT) + 1.8639 where: T is temperature, and VO is the measured output voltage of the LM20. 10090824 October 2005 © 2005 National Semiconductor Corporation DS100908 www.national.com |
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