LM95071CIMF/NOPB National Semiconductor, LM95071CIMF/NOPB Datasheet - Page 11

• Manufacturer Part Number: LM95071CIMF/NOPB
• Description: IC TEMP SENSOR 13BIT SOT23-5
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM95071CIMF/NOPB

• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Comparator, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -40°C ~ 150°C
• Output Type: MICROWIRE™, SPI™
• Output Alarm: No
• Output Fan: No
• Voltage - Supply: 2.4 V ~ 5.5 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• For Use With: LM95071EVAL - BOARD EVALUATION LM95071
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM95071CIMF; LM95071CIMFTR

3.0 Application Hints
3.1 THERMAL PATH CONSIDERATIONS
To get the expected results when measuring temperature
with an integrated circuit temperature sensor like the
LM95071, it is important to understand that the sensor mea-
sures its own die temperature. For the LM95071, the best
thermal path between the die and the outside world is
through the LM95071’s pins. In the SOT23 package, all the
pins on the LM95071 will have an equal effect on the die
temperature. Because the pins represent a good thermal
path to the LM95071 die, the LM95071 will provide an accu-
rate measurement of the temperature of the printed circuit
board on which it is mounted. There is a less efficient ther-
mal path between the plastic package and the LM95071 die.
If the ambient air temperature is significantly different from
the printed circuit board temperature, it will have a small
effect on the measured temperature.
4.0 Typical Applications
FIGURE 9. LM95071 digital input control using microcontroller’s general purpose I/O.
FIGURE 8. Temperature monitor using Intel 196 processor
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3.2 OUTPUT CONSIDERATIONS: TIGHT ACCURACY,
FINE RESOLUTION AND LOW NOISE
The LM95071 is well suited for applications that require tight
temperature measurement accuracy. In many applications,
from process control to HVAC, the low temperature error can
mean better system performance and, by eliminating a sys-
tem calibration step, lower production cost.
With it’s fine digital resolution the LM95071 senses and
reports very small changes in its temperature, making it ideal
for applications where temperature sensitivity is important.
For example, the LM95071 enables the system to quickly
identify the direction of temperature change, allowing the
processor to take compensating action before the system
reaches a critical temperature.
The LM95071 has very low output noise (see the Output
Noise plot in the Typical Performance section), which makes
it ideal for applications where stable thermal compensation
is a priority. For example, in a temperature-compensated
oscillator application, the very small deviation in successive
temperature readings translates to a stable frequency output
from the oscillator.
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