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Thursday, February 10, 2011

LM35 temperature sensor

IC LM35 temperature sensor is used to convert the temperature scale thatcaptured the magnitude of voltage. This sensor has high precision, very simple withonly a 3-foot pieces. IC LM35 first leg connected to a power source, the second leg asthe output and the third leg connected to ground. The images and characteristics ofLM35 IC is as follows:



1. Can be calibrated directly to the Celsius scale.
2. Linear scale factor + 10mV / ° C
3. The accuracy of 0.5 ° C. at room temperature (25 ° C).
4.  Range of temperature between -55 ° C to 150 ° C.
5.  Work on the voltage 4 volts to 30 volts.
6. Operating current less than 60μA.
7. Low output impedance 0.1 Ω for 1 mA load



LM35 works by changing the temperature into voltage. Ideal voltage coming out of the LM35 has a ratio of 100 ° C is equal 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.

Although the voltage sensor can reach 30 volts but given  to sensor is at 5 volts, so it can be used with single power supply with the provision that the LM35 only require a current of 60 μA this means that LM35 has the ability to produce heat (self-heating) ofthe sensor which can cause a low reading error is less than 0.5 º C at a temperature of25 º C.


Distances required liaison is not affected by interference from outside, so use agrounded cable sheath so that it can act as an antenna, receiver and deviation in it,also can act as rectifiers and rectified in such a case, using the method of bypasscapacitors Vin to earthed. 

Some variants LM35:
1. 
LM35, LM35A has a range of -55 º C to +150 º C.
2. LM35C, LM35CA has a range of -40 º C to +110 º C.
3. LM35D has a range of 0 º C to +100 º C.

to datasheet doawnload here


salam aneuk kayee....








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