GPI/O

RXD

TXD

CS

SI/O

SC

V

+

GND

0.1 2F

Intel

196

Micro-

Controller

LM95071/

LM95071-Q1

+5V

LM95071, LM95071-Q1

SNIS137D – AUGUST 2004 – REVISED SEPTEMBER 2013

www.ti.com

APPLICATION HINTS

THERMAL PATH CONSIDERATIONS

To get the expected results when measuring temperature with an integrated circuit temperature sensor like the

LM95071/LM95071-Q1, it is important to understand that the sensor measures its own die temperature. For the

LM95071/LM95071-Q1, the best thermal path between the die and the outside world is through the

LM95071/LM95071-Q1's pins. In the SOT-23 package, all the pins on the LM95071/LM95071-Q1 will have an

equal effect on the die temperature. Because the pins represent a good thermal path to the LM95071/LM95071-

Q1 die, the LM95071/LM95071-Q1 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

LM95071/LM95071-Q1 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.

OUTPUT CONSIDERATIONS: TIGHT ACCURACY, FINE RESOLUTION AND LOW NOISE

The LM95071/LM95071-Q1 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 system calibration step, lower production cost.

With it's fine digital resolution the LM95071/LM95071-Q1 senses and reports very small changes in its

temperature, making it ideal for applications where temperature sensitivity is important. For example, the

LM95071/LM95071-Q1 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/LM95071-Q1 has very low output noise (see Figure 9 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.

Typical Applications

Figure 14. Temperature monitor using Intel 196 processor

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