LM71CIMF National Semiconductor, LM71CIMF Datasheet - Page 10

• Manufacturer Part Number: LM71CIMF
• Description: Temperature Sensor IC
• Manufacturer: National Semiconductor

Specifications of LM71CIMF

• Peak Reflow Compatible (260 C): No
• Ic Function: Temperature Sensor IC
• Supply Voltage Max: 5.5V
• Leaded Process Compatible: No
• Supply Voltage Min: 2.65V
• Operating Temperature Min: -40°C
• Package / Case: 5-SOT-23
• Temperature Sensor Function: Temp Sensor
• Interface Type: 3-Wire/SPI
• Output Type: Digital
• Resolution: 13+SignBit
• Package Type: SOT-23
• Operating Temperature (min): -40C
• Operating Temperature (max): 150C
• Operating Temperature Classification: Automotive
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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2.0 Serial Bus Timing Diagrams
3.0 Application Hints
To get the expected results when measuring temperature with
an integrated circuit temperature sensor like the LM71, it is
important to understand that the sensor measures its own die
temperature. For the LM71, the best thermal path between
the die and the outside world is through the LM71's pins. In
the SOT23 package, all the pins on the LM71 will have an
equal effect on the die temperature. Because the pins repre-
sent a good thermal path to the LM71 die, the LM71 will
provide an accurate measurement of the temperature of the
printed circuit board on which it is mounted. There is a less
efficient thermal path between the plastic package and the
LM71 die. If the ambient air temperature is significantly dif-
a) Reading Continuous Conversion - Single Eight-Bit Frame
b) Reading Continuous Conversion - Two Eight-Bit Frames
c) Writing Shutdown Control
FIGURE 7. Timing Diagrams
10
ferent from the printed circuit board temperature, it will have
a small effect on the measured temperature.
In probe-type applications, the LM71 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
LM71 and accompanying wiring and circuits must be kept in-
sulated and dry, to avoid leakage and corrosion. This is
especially true if the circuit may operate at cold temperatures
where condensation can occur. Printed-circuit coatings and
varnishes such as Humiseal and epoxy paints or dips are of-
ten used to insure that moisture cannot corrode the LM71 or
its connections.
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