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PDF LM50CIM3X Data sheet ( Hoja de datos )
| Número de pieza | LM50CIM3X | |
| Descripción | SOT-23 Single-Supply Centigrade Temperature Sensor | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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July 1999
LM50
SOT-23 Single-Supply Centigrade Temperature Sensor
General Description
The LM50 is a precision integrated-circuit temperature sen-
sor that can sense a −40˚C to +125˚C temperature range us-
ing a single positive supply. The LM50’s output voltage is lin-
early proportional to Celsius (Centigrade) temperature
(+10 mV/˚C) and has a DC offset of +500 mV. The offset al-
lows reading negative temperatures without the need for a
negative supply. The ideal output voltage of the LM50 ranges
from +100 mV to +1.75V for a −40˚C to +125˚C temperature
range. The LM50 does not require any external calibration or
trimming to provide accuracies of ±3˚C at room temperature
and ±4˚C over the full −40˚C to +125˚C temperature range.
Trimming and calibration of the LM50 at the wafer level as-
sure low cost and high accuracy. The LM50’s linear output,
+500 mV offset, and factory calibration simplify circuitry re-
quired in a single supply environment where reading nega-
tive temperatures is required. Because the LM50’s quiescent
current is less than 130 µA, self-heating is limited to a very
low 0.2˚C in still air.
Applications
n Computers
n Disk Drives
n Battery Management
n Automotive
n FAX Machines
n Printers
n Portable Medical Instruments
n HVAC
n Power Supply Modules
Features
n Calibrated directly in degree Celsius (Centigrade)
n Linear + 10.0 mV/˚C scale factor
n ±2˚C accuracy guaranteed at +25˚C
n Specified for full −40˚ to +125˚C range
n Suitable for remote applications
n Low cost due to wafer-level trimming
n Operates from 4.5V to 10V
n Less than 130 µA current drain
n Low self-heating, less than 0.2˚C in still air
n Nonlinearity less than 0.8˚C over temp
Connection Diagram
SOT-23
DS012030-1
Top View
See NS Package Number MA03B
Typical Application
Order
Number
LM50BIM3
SOT-23
Device Marking
T5B
LM50CIM3
T5C
LM50BIM3X
T5B
LM50CIM3X
T5C
Supplied As
1000 Units on Tape
and Reel
1000 Units on Tape
and Reel
3000 Units on Tape
and Reel
3000 Units on Tape
and Reel
DS012030-3
FIGURE 1. Full-Range Centigrade Temperature Sensor (−40˚C to +125˚C)
© 1999 National Semiconductor Corporation DS012030
www.national.com
1 page  
2.0 Capacitive Loads (Continued)
pass the power supply voltage, as shown in Figure 4. In a
noisy environment it may be necessary to add a capacitor
from the output to ground. A 1 µF output capacitor with the
4 kΩ output impedance will form a 40 Hz lowpass filter. Since
the thermal time constant of the LM50 is much slower than
the 25 ms time constant formed by the RC, the overall re-
sponse time of the LM50 will not be significantly affected. For
much larger capacitors this additional time lag will increase
the overall response time of the LM50.
*R2 ≈ 2k with a typical 1300 ppm/˚C drift.
3.0 Typical Applications
FIGURE 5. Block Diagram
DS012030-17
DS012030-11
FIGURE 6. Centigrade Thermostat/Fan Controller
DS012030-13
FIGURE 7. Temperature To Digital Converter (Serial Output) (+125˚C Full Scale)
5 www.national.com
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| PDF Descargar | [ Datasheet LM50CIM3X.PDF ] | |
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