LM70 - SPI/MICROWIRE™10-Bit plus Sign Digital Temperature Sensor from the PowerWise® Family

Datasheet Packaging Samples & Pricing Reliability Application Notes Knowledge Base

Features
•0.25°C temperature resolution.
•Shutdown mode conserves power between temperature reading
•SPI and MICROWIRE Bus interface
•MSOP-8 and LLP-8 packages save space
•UL Recognized Component

Key Specification

Supply Voltage 2.65V to 5.5V
Supply Current operating260 µA (typ)
  490 µA (max)
 shutdown12 µA (typ)
Temperature Accuracy-40°C to 85°C±2°C(max)
 -10°C to 65°C +1.5/-2°C(max)
 -55°C to 125°C+3/-2°C(max)
 -55°C to 150°C+3.5/-2°C(max)

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. More...


Applications

•System Thermal Management
•Personal Computers
•Disk Drives
•Office Electronics
•Electronic Test Equipment
  Typical Application
click for larger image


Parametric Table     expand
Parametric Table    collapse
Temperature Accuracy (+/-) 2 deg C
Supply Min 2.7 Volt
Quiescent Current 0.49 mA
Temperature Min -55 deg C
Temperature Max 150 deg C
Interface Type SPI/Microwire
Temperature Accuracy (+/-) 2 deg C
Supply Min 2.7 Volt
Quiescent Current 0.49 mA
Temperature Min -55 deg C
Temperature Max 150 deg C
Interface Type SPI/Microwire
Programmable Setpoints No
Resolution 11 bit
Resolution degC/LSB 0.25
Supply Max 5.5 Volt
Shut down Yes
Fault Queue No
Automotive Selection Guide Yes
PowerWise Yes
View Using Catalog

  Additional Resources
Application Notes (see below)


Block Diagram

click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM70 SPI/MICROWIRE 10-Bit plus Sign Digital Temperature Sensor 694 Kbytes 10-Feb-06 View Online
Download
LM70 SPI/MICROWIRE 10-Bit plus Sign Digital Temperature Sensor (Japanese)
 483 Kbytes   Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM70CILD-3LLP8NOPB3260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.68reel
of
1000		ZXYTT
T33
8 weeks2000
LM70CILD-5LLP8NOPB3260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.68reel
of
1000		ZXYTT
T35
8 weeks500
LM70CILDX-3LLP8NOPB3260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.68reel
of
4500		ZXYTT
T33
8 weeks5000
LM70CILDX-5LLP8RoHS Download Full productionN/A
 
Buy Now 		1K+$0.68reel
of
4500		ZXYTT
T35
12 weeksN/A
LM70CIMM-3MINI SOIC8STD
NOPB		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.67reel
of
1000		ZXTT
T04C
6 weeks10000
LM70CIMM-5MINI SOIC8STD
NOPB		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.67reel
of
1000		ZXTT
T03C
6 weeks2000
LM70CIMMX-3MINI SOIC8STD
NOPB		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.67reel
of
3500		ZXTT
T04C
6 weeks5000
LM70CIMMX-5MINI SOIC8NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.67reel
of
3500		ZXTT
T03C
6 weeks7500

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, electronic test equipment, and office electronics.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM * LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM70CILD-3CS06512621539029170002827706714
LM70CILD-5CS06512621539029170002827706714
LM70CILDX-3CS06512621539029170002827706714
LM70CILDX-5CS06512621539029170002827706714
LM70CIMM-3CS06512621539029170002827706714
LM70CIMM-5CS06512621539029170002827706714
LM70CIMMX-3CS06512621539029170002827706714
LM70CIMMX-5CS06512621539029170002827706714

Note: The Early Failure Rates were calculated as point estimates. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1256: Application Note 1256 Tiny Temperature Sensors for Portable Systems 66 Kbytes 1-Oct-02 Download

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More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1155: Application Note 1155 A Simple Software I2C Routine for the COP8 82 Kbytes 12-May-00 Download

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[Information as of 7-Jan-2009]