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PDF LM95071CIMFX Data sheet ( Hoja de datos )
| Número de pieza | LM95071CIMFX | |
| Descripción | SPI/MICROWIRE 13-Bit Plus Sign Temperature Sensor | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM95071CIMFX (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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August 2004
LM95071
SPI/MICROWIRE™ 13-Bit Plus Sign Temperature Sensor
General Description
The LM95071 is a low-power, high-resolution digital tem-
perature sensor with an SPI and MICROWIRE compatible
interface, available in the 5-pin SOT23. The host can query
the LM95071 at any time to read temperature. Its low oper-
ating current is useful in systems where low power consump-
tion is critical.
The LM95071 has 13-bit plus sign temperature resolution
(0.03125˚C per LSB) while operating over a temperature
range of −40˚C to +150˚C.
The LM95071’s 2.4V to 5.5V supply voltage range, fast
conversion rate, low supply current, and simple SPI interface
make it ideal for a wide range of applications.
Applications
n System Thermal Management
n Portable Electronic Devices
n Personal Computers
n Disk Drives
n Office Electronics
n Electronic Test Equipment
Features
n Small SOT23-5 package saves space
n Shutdown mode conserves power between temperature
readings
n Operates over a full −40˚C to +150˚C range
n SPI and MICROWIRE Bus interface
Key Specifications
j Supply Voltage
j Supply Current
j Temperature
Accuracy
j Temperature
Resolution
operating
shutdown
0˚C to 70˚C
−40˚C to 150˚C
2.4V to 5.5V
280 µA (typ)
6 µA (typ)
±1˚C (max)
±2˚C (max)
0.03125 ˚C
Simplified Block Diagram
MICROWIRE™ is a trademark of National Semiconductor Corporation.
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS201065
20106501
www.national.com
1 page  
Logic Electrical Characteristics (Continued)
Notes
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating
the device beyond its rated operating conditions.
Note 2: When the input voltage (VI) at any pin exceeds the power supplies (VI < GND or VI > VDD) the current at that pin should be limited to 5 mA.
Note 3: Reflow temperature profiles are different for lead-free and non-lead-free packages.
Note 4: Human body model, 100 pF discharged through a 1.5 kΩ resistor. Machine model, 200 pF discharged directly into each pin.
Note 5: The life expectancy of the LM95071 will be reduced when operating at elevated temperatures. LM95071 θJA (thermal resistance, junction-to-ambient) when
attached to a printed circuit board with 2 oz. foil is summarized in the table below:
Device Number
LM95071CIMF
NS Package
Number
MF05A
Thermal
Resistance (θJA)
250˚C/W
Note 6: The LM95071 will operate properly over the VDD supply voltage range of 2.4V to 5.5V.
Note 7: Typicals are at TA = 25˚C and represent most likely parametric norm.
Note 8: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 9: This specification is provided only to indicate how often temperature data is updated. The LM95071 can be read at any time without regard to conversion
state (and will yield last conversion result). A conversion in progress will not be interrupted. The output shift register will be updated at the completion of the read
and a new conversion restarted.
Note 10: For best accuracy, minimize output loading. Higher sink currents can affect sensor accuracy with internal heating.
5 www.national.com
5 Page 
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
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.
20106520
FIGURE 8. Temperature monitor using Intel 196 processor
20106519
FIGURE 9. LM95071 digital input control using microcontroller’s general purpose I/O.
11 www.national.com
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| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LM95071CIMFX.PDF ] | |
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