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PDF LM62CIM3 Data sheet ( Hoja de datos )
| Número de pieza | LM62CIM3 | |
| Descripción | 2.7V/ 15.6 mV/C SOT-23 Temperature Sensor | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 1999
LM62
2.7V, 15.6 mV/˚C SOT-23 Temperature Sensor
General Description
The LM62 is a precision integrated-circuit temperature sen-
sor that can sense a 0˚C to +90˚C temperature range while
operating from a single +3.0V supply. The LM62’s output
voltage is linearly proportional to Celsius (Centigrade) tem-
perature (+15.6 mV/˚C) and has a DC offset of +480 mV.
The offset allows reading temperatures down to 0˚C without
the need for a negative supply. The nominal output voltage of
the LM62 ranges from +480 mV to +1884 mV for a 0˚C to
+90˚C temperature range. The LM62 is calibrated to provide
accuracies of ±2.0˚C at room temperature and +2.5˚C/
−2.0˚C over the full 0˚C to +90˚C temperature range.
The LM62’s linear output, +480 mV offset, and factory cali-
bration simplify external circuitry required in a single supply
environment where reading temperatures down to 0˚C is re-
quired. Because the LM62’s quiescent current is less than
130 µA, self-heating is limited to a very low 0.2˚C in still air.
Shutdown capability for the LM62 is intrinsic because its in-
herent low power consumption allows it to be powered di-
rectly from the output of many logic gates.
Features
n Calibrated linear scale factor of +15.6 mV/˚C
n Rated for full 0˚C to +90˚C range with 3.0V supply
n Suitable for remote applications
Applications
n Cellular Phones
n Computers
n Power Supply Modules
n Battery Management
n FAX Machines
n Printers
n HVAC
n Disk Drives
n Appliances
Key Specifications
n Accuracy at 25˚C
n Temperature Slope
n Power Supply Voltage Range
n Current Drain @ 25˚C
n Nonlinearity
n Output Impedance
Connection Diagram
Typical Application
SOT-23
±2.0 or ±3.0˚C
(max)
+15.6 mV/˚C
+2.7V to +10V
130 µA (max)
±0.8˚C (max)
4.7 kΩ (max)
DS100893-1
Top View
See NS Package Number MA03B
Ordering Information
Order
Number
LM62BIM3
LM62BIM3X
LM62CIM3
LM62CIM3X
SOT-23
Device
Marking
T7B
T7B
T7C
T7C
Supplied As
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
VO = (+15.6 mV/˚C x T˚C) + 480 mV
DS100893-2
Temperature (T)
+90˚C
+70˚C
+25˚C
0˚C
Typical VO
+1884 mV
+1572 mV
870 mV
+480 mV
FIGURE 1. Full-Range Centigrade Temperature Sensor
(0˚C to +90˚C) Stabilizing a Crystal Oscillator
© 1999 National Semiconductor Corporation DS100893
www.national.com
1 page  
1.0 Mounting (Continued)
The table shown in Figure 3 summarizes the rise in die tem-
perature of the LM62 without any loading, and the thermal
resistance for different conditions.
SOT-23
SOT-23
Still air
Moving
air
no heat sink
(Note 13)
θJA
(˚C/W)
TJ − TA
(˚C)
450 0.17
small heat fin
(Note 12)
θJA
(˚C/W)
TJ − TA
(˚C)
260 0.1
180 0.07
Note 12: Heat sink used is 1⁄2" square printed circuit board with 2 oz. foil with
part attached as shown in Figure 2 .
Note 13: Part soldered to 30 gauge wire.
FIGURE 3. Temperature Rise of LM62 Due to
Self-Heating and Thermal Resistance (θJA)
2.0 Capacitive Loads
The LM62 handles capacitive loading well. Without any spe-
cial precautions, the LM62 can drive any capacitive load as
shown in Figure 4. Over the specified temperature range the
LM62 has a maximum output impedance of 4.7 kΩ. In an ex-
tremely noisy environment it may be necessary to add some
filtering to minimize noise pickup. It is recommended that
0.1 µF be added from +VS to GND to bypass the power sup-
ply voltage, as shown in Figure 5. In a noisy environment it
may be necessary to add a capacitor from the output to
ground. A 1 µF output capacitor with the 4.7 kΩ maximum
output impedance will form a 34 Hz lowpass filter. Since the
thermal time constant of the LM62 is much slower than the
30 ms time constant formed by the RC, the overall response
time of the LM62 will not be significantly affected. For much
larger capacitors this additional time lag will increase the
overall response time of the LM62.
DS100893-15
FIGURE 4. LM62 No Decoupling Required for
Capacitive Load
DS100893-16
FIGURE 5. LM62 with Filter for Noisy Environment
FIGURE 6. Simplified Schematic
DS100893-17
5 www.national.com
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet LM62CIM3.PDF ] | |
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