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LM61CIM3X Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM61CIM3X Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 10 page LM61 2.7V, SOT-23 or TO-92 Temperature Sensor General Description The LM61 is a precision integrated-circuit temperature sen- sor that can sense a −30˚C to +100˚C temperature range while operating from a single +2.7V supply. The LM61’s output voltage is linearly proportional to Celsius (Centigrade) temperature (+10 mV/˚C) and has a DC offset of +600 mV. The offset allows reading negative temperatures without the need for a negative supply. The nominal output voltage of the LM61 ranges from +300 mV to +1600 mV for a −30˚C to +100˚C temperature range. The LM61 is calibrated to pro- vide accuracies of ±2.0˚C at room temperature and ±3˚C over the full −25˚C to +85˚C temperature range. The LM61’s linear output, +600 mV offset, and factory cali- bration simplify external circuitry required in a single supply environment where reading negative temperatures is re- quired. Because the LM61’s quiescent current is less than 125 µA, self-heating is limited to a very low 0.2˚C in still air. Shutdown capability for the LM61 is intrinsic because its inherent low power consumption allows it to be powered directly from the output of many logic gates. Features n Calibrated linear scale factor of +10 mV/˚C n Rated for full −30˚ to +100˚C range n Suitable for remote applications n UL Recognized Component 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 Key Specifications j Accuracy at 25˚C ±2.0 or ±3.0˚C (max) j Accuracy for −30˚C to +100˚C ±4.0˚C (max) j Accuracy for −25˚C to +85˚C ±3.0˚C (max) j Temperature Slope +10 mV/˚C j Power Supply Voltage Range +2.7V to +10V j Current Drain @ 25˚C 125 µA (max) j Nonlinearity ±0.8˚C (max) j Output Impedance 800 Ω (max) Typical Application 01289702 V O = (+10 mV/˚C x T ˚C) + 600 mV Temperature (T) Typical V O +100˚C +1600 mV +85˚C +1450 mV +25˚C +850 mV 0˚C +600 mV −25˚C +350 mV −30˚C +300 mV FIGURE 1. Full-Range Centigrade Temperature Sensor (−30˚C to +100˚C) Operating from a Single Li-Ion Battery Cell August 2005 © 2005 National Semiconductor Corporation DS012897 www.national.com |
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