LM71CIMF National Semiconductor, LM71CIMF Datasheet

Temperature Sensor IC

LM71CIMF

Manufacturer Part Number
LM71CIMF
Description
Temperature Sensor IC
Manufacturer
National Semiconductor
Datasheet

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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© 2011 National Semiconductor Corporation
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 conver-
sion rate, low supply current, and simple SPI interface make
it ideal for a wide range of applications. The LM71Q is avail-
able in the 5-lead SOT23 package only.
Applications
Simplified Block Diagram
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
System Thermal Management
Personal Computers
Portable Electronic Devices
Disk Drives
Office Electronics
Electronic Test Equipment
200317
LM71/LM71Q
■ 
■ 
■ 
Accuracy
■ 
Resolution
Features
Key Specifications
Supply Voltage
Supply Current
Temperature
Temperature
Vending Machines
Automotive
LM71Q is AEC-Q100 Grade 0 qualified and is
manufactured on an Automotive Grade Flow.
SOT23-5 or No-Pull-Back LLP-6 Packages
Operates over a full −40°C to +150°C range
SPI and MICROWIRE Bus interface
−10°C to +65°C
−40°C to 150°C
operating
20031701
January 20, 2011
+3/− 2°C (max)
www.national.com
2.65V to 5.5V
550 µA (max)
±1.5°C (max)
300 µA (typ)
31.25 m°C

Related parts for LM71CIMF

LM71CIMF Summary of contents

Page 1

... Portable Electronic Devices ■ Disk Drives ■ Office Electronics ■ Electronic Test Equipment Simplified Block Diagram TRI-STATE® registered trademark of National Semiconductor Corporation. © 2011 National Semiconductor Corporation LM71/LM71Q ■ Vending Machines ■ Automotive Features ■ LM71Q is AEC-Q100 Grade 0 qualified and is manufactured on an Automotive Grade Flow. ■ ...

Page 2

... Connection Diagrams SOT23-5 TOP VIEW NS Package Number MF05A Ordering Information Order Package Number Marking LM71CIMF T16C LM71CIMFX LM71QCIMF T16Q LM71QCIMFX LM71CISD LM71C LM71CISDX www.national.com 20031702 NS Supply Package Transport Media Voltage Number 1000 Units in Tape and Reel MF05A 2.65V to 5.5V 3000 Units in Tape and Reel ...

Page 3

Pin Descriptions Label Pin Number SOT23-5 LLP Chip Select input GND Power Supply Ground Slave Input/Output - Serial bus bi-directional SI data line. Shmitt trigger input. Slave Clock - Serial bus clock ...

Page 4

... Infrared (5 seconds) −0.3V to 6.0V ESD Susceptibility Human Body Model −0. 0.3V Machine Model 5 mA −65°C to +150°C Operating Ratings Specified Temperature Range (Note 5) 215°C LM71CIMF, LM71CISD, 220°C LM71QCIMF Supply Voltage Range (+V LM71CIMF, LM71CISD, LM71QCIMF = MIN Typical Conditions (Note ...

Page 5

SERIAL BUS DIGITAL SWITCHING CHARACTERISTICS Unless otherwise noted, these specifications apply for V 100 pF unless otherwise specified. Boldface limits apply for T otherwise noted. Symbol Parameter t SC (Clock) Period Low to SC (Clock) High Set-Up ...

Page 6

... Note 5: The life expectancy of the LM71 will be reduced when operating at elevated temperatures. LM71 θ attached to a printed circuit board with 2 oz. foil is summarized in the table below: Device Number LM71CIMF/LM71QCIMF LM71CISD Note 6: The LM71 will operate properly over the V Note 7: Typicals are 25° ...

Page 7

Electrical Characteristics FIGURE 5. Temperature-to-Digital Transfer Function (Non-linear scale for clarity) TRI-STATE Test Circuit 20031708 20031707 FIGURE 6. 7 www.national.com ...

Page 8

... FF hex for shutdown Another code may place the part into a test mode. Test modes are used by National Semiconductor to thoroughly test the function of the LM71 during production testing. Only eight bits have been defined above since only the last eight transmitted are detected by the LM71, before CS is taken HIGH ...

Page 9

... Note: setting D0-D15 to any other values may place the LM70 into a manufacturer's test mode, upon which the LM71 will stop responding as described. These test modes are to be used for National Semiconductor production testing only. See Section 1.2 Serial Bus Interface for a complete discussion. ...

Page 10

Serial Bus Timing Diagrams a) Reading Continuous Conversion - Single Eight-Bit Frame b) Reading Continuous Conversion - Two Eight-Bit Frames 3.0 Application Hints To get the expected results when measuring temperature with an integrated circuit temperature sensor like the ...

Page 11

Typical Applications FIGURE 8. Temperature monitor using Intel 196 processor FIGURE 9. LM71 digital input control using micro-controller's general purpose I/O. 20031720 11 20031719 www.national.com ...

Page 12

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted Order Number LM71 Top View CIMF/QCIMF NS Package Number MF05A 12 ...

Page 13

Order Number LM71 Bottom View CISD NS Package Number SDE06A 13 www.national.com ...

Page 14

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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