LM74CIM-5/NOPB National Semiconductor, LM74CIM-5/NOPB Datasheet

IC TEMP SENSOR DGTL 8-SOIC

LM74CIM-5/NOPB

Manufacturer Part Number
LM74CIM-5/NOPB
Description
IC TEMP SENSOR DGTL 8-SOIC
Manufacturer
National Semiconductor
Datasheet

Specifications of LM74CIM-5/NOPB

Function
Temp Monitoring System (Sensor)
Topology
ADC (Sigma Delta), Register Bank
Sensor Type
Internal
Sensing Temperature
-55°C ~ 150°C
Output Type
MICROWIRE™, SPI™
Output Alarm
No
Output Fan
No
Voltage - Supply
3 V ~ 5.5 V
Operating Temperature
-55°C ~ 150°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
*LM74CIM-5
*LM74CIM-5/NOPB
LM74CIM-5

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM74CIM-5/NOPB
Manufacturer:
NS
Quantity:
6 691
Part Number:
LM74CIM-5/NOPB
Quantity:
80
© 2011 National Semiconductor Corporation
SPI/MICROWIRE ™ 12-Bit Plus Sign Temperature Sensor
General Description
The LM74 is a temperature sensor, Delta-Sigma analog-to-
digital converter with an SPI and MICROWIRE compatible
interface. The host can query the LM74 at any time to read
temperature. A shutdown mode decreases power consump-
tion to less than 10 μA. This mode is useful in systems where
low average power consumption is critical.
The LM74 has 12-bit plus sign temperature resolution
(0.0625°C per LSB) while operating over a temperature range
of −55°C to +150°C.
The LM74's 3.0V to 5.5V supply voltage range, low supply
current and simple SPI interface make it ideal for a wide range
of applications. These include thermal management and pro-
tection applications in hard disk drives, printers, electronic
test equipment, and office electronics. The LM74 is available
in the SO-8 package as well as an 5-Bump micro SMD pack-
age.
Applications
Simplified Block Diagram
TRI-STATE
System Thermal Management
Personal Computers
Disk Drives
Office Electronics
Electronic Test Equipment
®
is a registered trademark of National Semiconductor Corporation.
100909
LM74
■ 
■ 
■ 
Accuracy
Features
Key Specifications
Supply Voltage
Supply Current
Temperature
0.0625°C temperature resolution.
Shutdown mode conserves power between temperature
reading
SPI and MICROWIRE Bus interface
5-Bump micro SMD package saves space
−25°C to 110°C
−55°C to 125°C
−10°C to 65°C
shutdown
operating
10090901
3.0V or 2.65V to
March 1, 2011
www.national.com
±1.25°C(max)
520μA (max)
±2.1°C(max)
265μA (typ)
±3°C(max)
3μA (typ)
5.5V

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LM74CIM-5/NOPB Summary of contents

Page 1

... Disk Drives ■ Office Electronics ■ Electronic Test Equipment Simplified Block Diagram TRI-STATE ® registered trademark of National Semiconductor Corporation. © 2011 National Semiconductor Corporation LM74 Features ■ 0.0625°C temperature resolution. ■ Shutdown mode conserves power between temperature reading ■ ...

Page 2

... SO-8 TOP VIEW NS Package Number M08A Ordering Information Package Order Number Marking LM74CIM-3 LM74CIM-3 LM74CIMX-3 LM74CIM-3 LM74CIM-5 LM74CIM-5 LM74CIMX-5 LM74CIM-5 LM74CITP-3 T10 LM74CITPX-3 T10 www.national.com 10090902 Note: - Pin numbers are referenced to the package marking text orientation. Pin 1 is designated by the square. ...

Page 3

... Function FIGURE 1. COP Microcontroller Interface 3 Typical Connection From and to Controller From Controller No Connection Ground No Connection No Connection From Controller DC Voltage from 3.0V to 5.5V for the LM74CIM and 2.65V to 5.5V for the LM74CIBP and LM74CITP. Bypass with a 0.1 μF ceramic capacitor. 10090903 www.national.com ...

Page 4

... Human Body Model LM74CIBP and LM74CITP, pin A2 (SC) LM74CIM,LM74CIBP, and LM74CITP all other pins Temperature-to-Digital Converter Characteristics Unless otherwise noted, these specifications apply for V for the LM74CIM -3 and 4.5V to 5.5V for the LM74 -5 limits =+25°C, unless otherwise noted Parameter Temperature Error ...

Page 5

... Low Level Output Voltage OL I TRI-STATE Output Leakage O_TRI-STATE Current SERIAL BUS DIGITAL SWITCHING CHARACTERISTICS Unless otherwise noted, these specifications apply for V for the LM74CIM -3 and 4.5V to 5.5V for the LM74 -5 specified. Boldface limits apply for T Symbol Parameter t SC (Clock) Period ...

Page 6

... The SOP (LM74CIM) parts are tested and specified for rated temperature error at their nominal supply voltage for temperature ranges of −10°C to +65°C, −55°C to +125°C and −55°C to +150°C. For the SOP (LM74CIM) parts, the temperature error specifications for temperature ranges of − ...

Page 7

Electrical Characteristics FIGURE 5. Temperature-to-Digital Transfer Function (Non-linear scale for clarity) TRI-STATE Test Circuit 10090908 FIGURE 6. 7 10090907 www.national.com ...

Page 8

... Shutdown mode can be used to optimize current drain for different applications. A Manufacture's/Device ID register identifies the LM74 as National Semiconductor prod- uct. 1.1 POWER UP AND POWER DOWN When the supply voltage is less than about 1.6V (typical), the LM74 is considered powered down ...

Page 9

... FF hex any others may place the part into a Test Mode. Test Modes are used by National Semiconductor to thoroughly test the function of the LM74 during production testing. Only eight bits have been defined above since only the last eight transmitted are detected by the LM74, before CS is taken HIGH. ...

Page 10

... Note: setting D0-D15 to any other values may place the LM74 into a manufacturer's test mode, upon which the LM74 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 11

Serial Bus Timing Diagrams a) Reading Continuous Conversion - Single Eight-Bit Frame b) Reading Continuous Conversion - Two Eight-Bit Frames 10090914 c) Writing Shutdown Control FIGURE 7. Timing Diagrams 11 10090915 10090918 www.national.com ...

Page 12

Application Hints To get the expected results when measuring temperature with an integrated circuit temperature sensor like the LM74 important to understand that the sensor measures its own die temperature. For the LM74, the best thermal path ...

Page 13

FIGURE 9. LM74 digital input control using micro-controller's general purpose I/O. 13 10090919 www.national.com ...

Page 14

... Physical Dimensions Order Number LM74CIM-3, LM74CIMX-3, LM74CIM-5 or LM74CIMX-5 Order Number LM74CIBP-3,LM74CIBPX-3, LM74CIBP-5, LM74CIBPX-5 The following dimensions apply to the BPD05MPB package shown above: X1=1565µm ±30µm, X2=1615µm ±30µm, X3=850µm ±50µm. www.national.com inches (millimeters) unless otherwise noted 8-Lead Molded Small Outline Package ...

Page 15

SMD Ball Grid Array Thin Package Order Number LM74CITP-3,LM74CITPX-3, LM74CITP-5, LM74CITPX-5 NS Package Number TPD05QSA The following dimensions apply to the TPD05QSA package shown above: X1=1590µm ±30µm, X2=1641µm ±30µm, X3=500µm ±75µm. 15 www.national.com ...

Page 16

... 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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