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LM135H Scheda tecnica(PDF) 6 Page - Texas Instruments

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Il numero della parte LM135H
Spiegazioni elettronici  LM135/LM235/LM335, LM135A/LM235A/LM335A Precision Temperature Sensors
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Produttore elettronici  TI1 [Texas Instruments]
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LM135, LM135A, LM235, LM235A, LM335, LM335A
SNIS160D – MAY 1999 – REVISED MARCH 2013
www.ti.com
APPLICATION INFORMATION
CALIBRATING THE LM135
Included on the LM135 chip is an easy method of calibrating the device for higher accuracies. A pot connected
across the LM135 with the arm tied to the adjustment terminal allows a 1-point calibration of the sensor that
corrects for inaccuracy over the full temperature range.
This single point calibration works because the output of the LM135 is proportional to absolute temperature with
the extrapolated output of sensor going to 0V output at 0°K (
−273.15°C). Errors in output voltage versus
temperature are only slope (or scale factor) errors so a slope calibration at one temperature corrects at all
temperatures.
The output of the device (calibrated or uncalibrated) can be expressed as:
(1)
where T is the unknown temperature and To is a reference temperature, both expressed in degrees Kelvin. By
calibrating the output to read correctly at one temperature the output at all temperatures is correct. Nominally the
output is calibrated at 10 mV/°K.
To insure good sensing accuracy several precautions must be taken. Like any temperature sensing device, self
heating can reduce accuracy. The LM135 should be operated at the lowest current suitable for the application.
Sufficient current, of course, must be available to drive both the sensor and the calibration pot at the maximum
operating temperature as well as any external loads.
If the sensor is used in an ambient where the thermal resistance is constant, self heating errors can be calibrated
out. This is possible if the device is run with a temperature stable current. Heating will then be proportional to
zener voltage and therefore temperature. This makes the self heating error proportional to absolute temperature
the same as scale factor errors.
WATERPROOFING SENSORS
Meltable inner core heat shrinkable tubing such as manufactured by Raychem can be used to make low-cost
waterproof sensors. The LM335 is inserted into the tubing about ½
″ from the end and the tubing heated above
the melting point of the core. The unfilled ½
″ end melts and provides a seal over the device.
Typical Applications
Figure 15. Basic Temperature Sensor
Figure 17. Wide Operating Supply
Figure 16. Calibrated Sensor
*Calibrate for 2.982V at 25°C
6
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Copyright © 1999–2013, Texas Instruments Incorporated
Product Folder Links: LM135 LM135A LM235 LM235A LM335 LM335A


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