Rainbow Electronics LM62 - Manual

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
required. 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
inherent low power consumption allows it to be powered
directly 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 ± 2.0 or ± 3.0˚C (max)
n Temperature Slope +15.6 mV/˚C
n Power Supply Voltage Range +2.7V to +10V
n Current Drain @ 25˚C 130 µA (max)
n Nonlinearity ± 0.8˚C (max)
n Output Impedance 4.7 k
Ω
(max)
Connection Diagram
Ordering Information
Order SOT-23
Number Device Supplied As
Marking
LM62BIM3 T7B 1000 Units on Tape and Reel
LM62BIM3X T7B 3000 Units on Tape and Reel
LM62CIM3 T7C 1000 Units on Tape and Reel
LM62CIM3X T7C 3000 Units on Tape and Reel
Typical Application
SOT-23
DS100893-1
Top View
See NS Package Number MA03B
DS100893-2
V
O
= (+15.6 mV/˚C x T˚C) + 480 mV
Temperature (T) Typical V
O
+90˚C +1884 mV
+70˚C +1572 mV
+25˚C 870 mV
0˚C +480 mV
FIGURE 1. Full-Range Centigrade Temperature Sensor
(0˚C to +90˚C) Stabilizing a Crystal Oscillator
June 1999
LM62
2.7V
,
15.6
mV/˚C,
SOT
-23
T
emperature
Sensor
© 2001 National Semiconductor Corporation DS100893 www.national.com