The LM35 series are precision integrated-circuit temperature
sensors, whose output voltage is linearly proportional to the
Celsius (Centigrade) temperature. The LM35 thus has an
advantage over linear temperature sensors calibrated in
˚ Kelvin, as the user is not required to subtract a large
constant voltage from its output to obtain convenient Centi-
grade scaling. The LM35 does not require any external
calibration or trimming to provide typical accuracies of ± 1 ⁄ 4 ˚C
at room temperature and ± 3 ⁄ 4 ˚C over a full −55 to +150˚C
temperature range. Low cost is assured by trimming and
calibration at the wafer level. The LM35's low output imped-
ance, linear output, and precise inherent calibration make
interfacing to readout or control circuitry especially easy.
Applications
It can be used with single power supplies, or with plus and
minus supplies. As it draws only 60 µA from its supply, it has
very low self-heating, less than 0.1˚C in still air. The LM35 is
rated to operate over a −55˚ to +150˚C temperature range,
while the LM35C is rated for a −40˚ to +110˚C range (−10˚
with improved accuracy).
Features
1. Calibrated directly in ˚ Celsius (Centigrade)
2.Linear + 10.0 mV/˚C scale factor
3. 0.5˚C accuracy guaranteeable (at +25˚C)
4. Rated for full −55˚ to +150˚C range
5. Suitable for remote applications
6. Low cost due to wafer-level trimming
7. Operates from 4 to 30 volts
8. Less than 60 µA current drain
9. Low self-heating, 0.08˚C in still air
10. Nonlinearity only ± 1 ⁄ 4 ˚C typical
11. Low impedance output, 0.1 Ω for 1 mA load
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