lm70cimmx-5 National Semiconductor Corporation, lm70cimmx-5 Datasheet

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lm70cimmx-5

Manufacturer Part Number
lm70cimmx-5
Description
Spi/microwire 10-bit Plus Sign Digital Temperature
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2006 National Semiconductor Corporation
LM70
SPI/MICROWIRE 10-Bit plus Sign Digital Temperature
Sensor
General Description
The LM70 is a temperature sensor, Delta-Sigma analog-to-
digital converter with an SPI and MICROWIRE compatible
interface available in LLP and MSOP 8-pin packages. The
host can query the LM70 at any time to read temperature. A
shutdown mode decreases power consumption to less than
10 µA. This mode is useful in systems where low average
power consumption is critical.
The LM70 has 10-bit plus sign temperature resolution
(0.25˚C per LSB) while operating over a temperature range
of −55˚C to +150˚C.
The LM70’s 2.65V 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 protection applications in hard disk drives, printers, elec-
tronic test equipment, and office electronics.
Applications
n System Thermal Management
n Personal Computers
n Disk Drives
n Office Electronics
n Electronic Test Equipment
Simplified Block Diagram
DS101223
Features
n 0.25˚C temperature resolution.
n Shutdown mode conserves power between temperature
n SPI and MICROWIRE Bus interface
n MSOP-8 and LLP-8 packages save space
n UL Recognized Component
Key Specifications
j
j
j
reading
Accuracy
Supply Voltage
Supply Current
Temperature
−55˚C to 125˚C
−55˚C to 150˚C
−40˚C to 85˚C
−10˚C to 65˚C
10122301
shutdown
operating
February 2006
+1.5/−2˚C(max)
+3.5/−2˚C(max)
www.national.com
2.65V to 5.5V
490 µA (max)
+3/−2˚C(max)
260 µA (typ)
12 µA (typ)
±
2˚C(max)

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lm70cimmx-5 Summary of contents

Page 1

... System Thermal Management n Personal Computers n Disk Drives n Office Electronics n Electronic Test Equipment Simplified Block Diagram © 2006 National Semiconductor Corporation Features n 0.25˚C temperature resolution. n Shutdown mode conserves power between temperature reading n SPI and MICROWIRE Bus interface n MSOP-8 and LLP-8 packages save space ...

Page 2

... Order Number Marking LM70CILD-3 T33 LM70CILDX-3 T33 LM70CILD-5 T35 LM70CILDX-5 T35 LM70CIMM-3 T04C LM70CIMMX-3 T04C LM70CIMM-5 T03C LM70CIMMX-5 T03C Pin Descriptions Label SOP-8 LLP-8 Pin # Pin # SI Input/Output - Serial bus bi-directional data line. Schmitt trigger input Clock - Serial bus clock Schmitt trigger input line ...

Page 3

Typical Application FIGURE 1. COP Microcontroller Interface 3 10122303 www.national.com ...

Page 4

Absolute Maximum Ratings Supply Voltage Voltage at any Pin Input Current at any Pin (Note 2) Package Input Current (Note 2) Storage Temperature Soldering Information, Lead Temperature MSOP-8 and LLP-8 Packages (Note 3) Vapor Phase (60 seconds) Infrared (15 seconds) ...

Page 5

Logic Electrical Characteristics Serial Bus Digital Switching Characteristics Unless otherwise noted, these specifications apply for V LM70-5, C (load capacitance) on output lines = 100 pF unless otherwise specified. Boldface limits apply for all other ...

Page 6

Electrical Characteristics 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 ...

Page 7

Electrical Characteristics FIGURE 5. Temperature-to-Digital Transfer Function (Non-linear scale for clarity) TRI-STATE Test Circuit (Continued) FIGURE 6. 7 10122308 10122307 www.national.com ...

Page 8

Typical Performance Characteristics Average Power-On Reset Voltage vs Temperature Temperature Error www.national.com Static Supply Current vs Temperature 10122323 10122322 8 10122321 ...

Page 9

Functional Description The LM70 temperature sensor incorporates a band-gap type temperature sensor and 10-bit plus sign ∆Σ ADC (Delta- Sigma Analog-to-Digital Converter). Compatibility of the LM70’s three wire serial interface with SPI and MICROWIRE allows simple communications with common ...

Page 10

Functional Description 1.5 INTERNAL REGISTER STRUCTURE The LM70 has three registers, the temperature register, the configuration register and the manufacturer’s/device identifi- cation register. The temperature and manufacturer’s/device identification registers are read only. The configuration reg- ister is write only. ...

Page 11

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 12

Typical Applications FIGURE 8. Temperature monitor using Intel 196 processor FIGURE 9. LM70 digital input control using micro-controller’s general purpose I/O. www.national.com 10122320 12 10122319 ...

Page 13

... Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead Molded Mini Small Outline Package (MSOP) Order Number LM70CIMM-3, LM70CIMMX-3, LM70CIMM-5 or LM70CIMMX-5 Order Number LM70CILD-3, LM70CILDX-3, LM70CILD-5 or LM70CILDX-5 (JEDEC REGISTRATION NUMBER M0-187) NS Package Number MUA08A 8-Lead Molded Leadless Leadframe Package NS Package Number LDA08A 13 www ...

Page 14

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information ...

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