LM35 sensor works by changing the temperature scale into the amount of voltage. Ideal voltage that comes out of the LM35 has a ratio of 100 ° C is equivalent to 1 volt. This sensor has a self heating (self heating) of less than 0.1 ° C, can be operated using a single power supply and can be connected to an interface (interface) control circuit that is very easy.
– Has a temperature sensitivity, with linear scaling factor between the voltage and temperature of 10 mVolt / ºC, so it can be calibrated directly in centigrade.
– Has the accuracy or calibration accuracy is 0,5ºC at a temperature of 25 ° C as shown in Figure 2.2.
– It has a maximum range of operating temperature range of -55 ºC to +150 ºC.
– Working at a voltage of 4 to 30 volts.
– Has a low current of less than 60 uA.
– Having low self-heating (low-heating) of less than 0.1 ° C in still air.
– Has a low output impedance is 0.1 W for 1 mA load.
– Have nonlinearities only about ± ¼ ºC.
Graph characteristics of the LM35 temperature
LM IC 35 does not require calibration or adjustment from the outside because of its accuracy until approximately a quarter of a degree Celsius at room temperature. Term sensors ranging from – 55 ° C to 150 ° C, IC LM35 is very easy to use, functioned as the control of the power supply indicator display split. IC LM 35 can be energized 60 μ A of supplay so that the heat generated by itself is very low less than 0 ° C at room temperature.
To detect the temperature used an LM35 temperature sensor that can be calibrated directly in C (Celsius), it functioned as a basic LM35 temperature sensor. The privilege of IC LM 35 is:
– Calibration in units of degrees Celsius.
– linearity of +10 mV / ºC
– Accuracy 0.5 º C at room temperature.
– Range +2 º C – 150 º C.
– Operated at 4 V power supply – 30 V.
– Current flowing less than 60 uA