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PDF LM71CISD Data sheet ( Hoja de datos )
| Número de pieza | LM71CISD | |
| 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 LM71CISD (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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March 2004
LM71
SPI/MICROWIRE™ 13-Bit Plus Sign Temperature Sensor
General Description
The LM71 is a low-power, high-resolution digital temperature
sensor with an SPI and MICROWIRE compatible interface,
available in the 5-pin SOT23 or the 6-pin LLP (no pull back)
package. The host can query the LM71 at any time to read
temperature. Its low operating current is useful in systems
where low power consumption is critical.
The LM71 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 LM71’s 2.65V to 5.5V supply voltage range, fast con-
version rate, low supply current, and simple SPI interface
make it ideal for a wide range of applications.
Applications
n System Thermal Management
n Personal Computers
n Portable Electronic Devices
n Disk Drives
n Office Electronics
n Electronic Test Equipment
n Vending Machines
Features
n SOT23-5 or No-Pull-Back LLP-6 Packages
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
2.65V to 5.5V
300 µA (typ)
550 µA (max)
−10˚C to +65˚C
−40˚C to 150˚C
±1.5˚C (max)
+3/− 2˚C (max)
31.25 m˚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 DS200317
20031701
www.national.com
1 page  
Logic Electrical Characteristics (Continued)
SERIAL BUS DIGITAL SWITCHING CHARACTERISTICS Unless otherwise noted, these specifications apply for V+ = 2.65V
to 3.6V (Note 6); CL (load capacitance) on output lines = 100 pF unless otherwise specified. Boldface limits apply for TA = TJ
= TMIN to TMAX; all other limits TA = TJ = +25˚C, unless otherwise noted.
Symbol
Parameter
Conditions
Typical
(Note 7)
Limits
(Note 8)
Units
(Limit)
t1 SC (Clock) Period
0.16
DC
µs (min)
(max)
t2 CS Low to SC (Clock) High Set-Up Time
t3 CS Low to Data Out (SO) Delay
t4 SC (Clock) Low to Data Out (SO) Delay
t5 CS High to Data Out (SO) TRI-STATE
t6 SC (Clock) High to Data In (SI) Hold Time
t7 Data In (SI) Set-Up Time to SC (Clock) High
100 ns (min)
70 ns (max)
70 ns (max)
200 ns (max)
50 ns (min)
30 ns (min)
FIGURE 2. Data Output Timing Diagram
20031704
FIGURE 3. TRI-STATE Data Output Timing Diagram
20031705
5 www.national.com
5 Page 
4.0 Typical Applications
FIGURE 8. Temperature monitor using Intel 196 processor
20031720
20031719
FIGURE 9. LM71 digital input control using micro-controller’s general purpose I/O.
11 www.national.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LM71CISD.PDF ] | |
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