LM35-MWC National Semiconductor Corporation, LM35-MWC Datasheet

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LM35-MWC

Manufacturer Part Number
LM35-MWC
Description
Precision Centigrade Temperature Sensors
Manufacturer
National Semiconductor Corporation
Datasheet
© 2000 National Semiconductor Corporation
LM35
Precision Centigrade Temperature Sensors
General Description
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
at room temperature and
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. 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). The LM35 series is available pack-
Typical Applications
FIGURE 1. Basic Centigrade Temperature Sensor
(+2˚C to +150˚C)
±
3
4
˚C over a full −55 to +150˚C
DS005516-3
DS005516
±
1
4
˚C
aged in hermetic TO-46 transistor packages, while the
LM35C, LM35CA, and LM35D are also available in the
plastic TO-92 transistor package. The LM35D is also avail-
able in an 8-lead surface mount small outline package and a
plastic TO-220 package.
Features
n Calibrated directly in ˚ Celsius (Centigrade)
n Linear + 10.0 mV/˚C scale factor
n 0.5˚C accuracy guaranteeable (at +25˚C)
n Rated for full −55˚ to +150˚C range
n Suitable for remote applications
n Low cost due to wafer-level trimming
n Operates from 4 to 30 volts
n Less than 60 µA current drain
n Low self-heating, 0.08˚C in still air
n Nonlinearity only
n Low impedance output, 0.1
FIGURE 2. Full-Range Centigrade Temperature Sensor
Choose R
V
OUT
=+1,500 mV at +150˚C
= +250 mV at +25˚C
= −550 mV at −55˚C
±
1
1
= −V
4
˚C typical
S
/50 µA
DS005516-4
for 1 mA load
November 2000
www.national.com

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LM35-MWC Summary of contents

Page 1

... 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). The LM35 series is available pack- Typical Applications DS005516-3 FIGURE 1 ...

Page 2

... Small Outline Molded Package DS005516-21 N. Connection Top View Order Number LM35DM See NS Package Number M08A TO-220 Plastic Package* DS005516-24 *Tab is connected to the negative pin (GND). Note: The LM35DT pinout is different than the discontinued LM35DP. Order Number LM35DT See NS Package Number TA03F 2 ...

Page 3

... Vapor Phase (60 seconds) Infrared (15 seconds) +35V to −0.2V ESD Susceptibility (Note 11) +6V to −1.0V Specified Operating Temperature Range (Note 2) LM35, LM35A −60˚C to +180˚C LM35C, LM35CA −60˚C to +150˚C LM35D −65˚C to +150˚C −65˚C to +150˚C 300˚C ...

Page 4

... LM35 and LM35A; −40˚ =50 µA, in the circuit of Figure 2 . These specifications also apply from +2˚ LOAD resistor. 4 LM35C, LM35D Tested Design Units Typical Limit Limit (Max.) (Note 4) (Note 5) ± ± ...

Page 5

Typical Performance Characteristics Thermal Resistance Junction to Air DS005516-25 Thermal Response in Stirred Oil Bath DS005516-28 Quiescent Current vs. Temperature (In Circuit of Figure 2 .) DS005516-31 Thermal Time Constant DS005516-26 Minimum Supply Voltage vs. Temperature DS005516-29 Accuracy vs. Temperature ...

Page 6

... Alternatively, the LM35 can be mounted inside a sealed-end metal tube, and can then be dipped into a bath or screwed into a threaded hole in a tank. As with any IC, the LM35 and accompanying wiring and circuits must be kept insulated and dry, to avoid leakage and corrosion. This is especially true if the circuit may operate at cold temperatures where conden- sation can occur ...

Page 7

... FIGURE 4. LM35 with R-C Damper CAPACITIVE LOADS Like most micropower circuits, the LM35 has a limited ability to drive heavy capacitive loads. The LM35 by itself is able to drive 50 pf without special precautions. If heavier loads are anticipated easy to isolate or decouple the load with a resistor; see Figure you can improve the tolerance of capacitance with a series R-C damper from output to ground ...

Page 8

Typical Applications (Continued) FIGURE 10. Fahrenheit Thermometer FIGURE 13. Temperature To Digital Converter (Serial Output) (+128˚C Full Scale) FIGURE 14. Temperature To Digital Converter (Parallel TRI-STATE Standard Data Bus to µP Interface) (128˚C Full Scale) www.national.com FIGURE 11. Centigrade Thermometer ...

Page 9

... B B Trim R for V =1.955V C C Trim R for V =0.075V + 100mV/˚ ambient Example, V =2.275V at 22˚C A FIGURE 15. Bar-Graph Temperature Display (Dot Mode) FIGURE 16. LM35 With Voltage-To-Frequency Converter And Isolated Output (2˚C to +150˚ 1500 Hz) 9 DS005516-16 DS005516-15 www.national.com ...

Page 10

Block Diagram www.national.com DS005516-23 10 ...

Page 11

... Physical Dimensions inches (millimeters) unless otherwise noted TO-46 Metal Can Package (H) Order Number LM35H, LM35AH, LM35CH, LM35CAH, or LM35DH NS Package Number H03H SO-8 Molded Small Outline Package (M) Order Number LM35DM NS Package Number M08A 11 www.national.com ...

Page 12

... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) Power Package TO-220 (T) Order Number LM35DT NS Package Number TA03F 12 ...

Page 13

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) unless otherwise noted (Continued) TO-92 Plastic Package (Z) Order Number LM35CZ, LM35CAZ or LM35DZ NS Package Number Z03A 2. A critical component is any component of a life ...

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