LM73 - 2.7V, SOT-23, 11- to 14- Bit Digital Temperature Sensor with 2-Wire Interface from the PowerWise® Family
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Application Notes Knowledge Base

Features
Single address pin offers choice of three selectable addresses per version for a total of six possible addresses.
SMBus and I 2C-compatible two-wire interface
Supports 400 kHz operation
Shutdown mode with one-shot feature available for very low average power consumption
Programmable digital temperature resolution from 11 bits to 14 bits.
Fast conversion rate ideal for quick power up and measuring rapidly changing temperature
Open-drain ^ALERT output pin goes active when temperature is above a programmed temperature limit
Very stable, low-noise digital ouput.
UL Recognized Component

Key Specification


Supply Voltage 2.7V to 5.5V
Supply Current operating 320 µA (typ)
495 µA (max)
shutdown 8 µA (max)
    1.9 µA (typ)
Temperature −10°C to 80°C ±1.0°C (max)
Accuracy −25°C to 115°C ±1.5°C (max)
  −40°C to 150°C ±2.0°C (max)
Resolution   0.25°C to 0.03125°C
Conversion Time 11-bit (0.25°C) 14 ms (max)
14-bit (0.03125°C) 112 ms (max)

General Description


The LM73 is an integrated, digital-output temperature sensor featuring an incremental Delta-Sigma ADC with a two-wire interface that is compatible with the SMBus and I 2C® interfaces. More...


Applications


Portable Electronics
Notebook Computers
Automotive
System Thermal Management
Office Electronics
  Typical Application
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ParametersValues
Temperature Accuracy (+/-) 1 deg C
Supply Min 2.7 Volt
Quiescent Current 0.495 mA
Temperature Min -40 deg C
Temperature Max 150 deg C
Interface Type 2-Wire Serial
Programmable Setpoints Yes
Resolution 14 bits
Resolution degC/LSB 0.03125
Supply Max 5.5 Volt
Shut down Yes
Interrupt Outputs 1
Fault Queue No
Automotive Yes
PowerWise Yes


Typical Performance


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  Additional Resources
Application Notes


Block Diagram


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Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM73 2.7V, SOT-23, 11-to-14 Bit Digital Temperature Sensor with 2-Wire Interface 442
Kbytes
13-May-09 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
LM73CIMK-0TSOT6NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$0.53reel
of
1000
T730
XTT
6 weeksN/A
LM73CIMK-1TSOT6NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$0.53reel
of
1000
T731
XTT
6 weeksN/A
LM73CIMKX-0TSOT6NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$0.53reel
of
3000
T730
XTT
6 weeksN/A
LM73CIMKX-1TSOT6NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$0.53reel
of
3000
T731
XTT
16 weeksN/A
LM73EVALLM73EVAL Evaluation BoardFull productionN/A
 
Buy Now
1+$63.501-
8 weeksN/A

General Description


The LM73 is an integrated, digital-output temperature sensor featuring an incremental Delta-Sigma ADC with a two-wire interface that is compatible with the SMBus and I 2C® interfaces. The host can query the LM73 at any time to read temperature. Available in a 6-pin SOT-23 package, the LM73 occupies very little board area while operating over a wide temperature range (-40°C to 150°C) and providing ±1.0°C accuracy from -10°C to 80°C. The user can optimize between the conversion time and the sensitivity of the LM73 by programming it to report temperature in any of four different resolutions. Defaulting to 11-bit mode (0.25°C/LSB), the LM73 measures temperature in a maximum time of 14 ms, making it ideal for applications that require temperature data very soon after power-up. In its maximum resolution, 14-bit mode (0.03125°C/LSB), the LM73 is optimized to sense very small changes in temperature.

A single multi-level address line selects one of three unique device addresses. An open-drain ^ALERT output goes active when the temperature exceeds a programmable limit. Both the data and clock lines are filtered for excellent noise tolerance and reliable communication. Additionally, a time-out feature on the clock and data lines causes the LM73 to automatically reset these lines if either is held low for an extended time, thus exiting any bus lock-up condition without processor intervention.

Reliability Metrics


Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM73CIMK-0CMOS70184060010890004309006723
LM73CIMK-1CMOS70184060010890004309006723
LM73CIMKX-0CMOS70184060010890004309006723
LM73CIMKX-1CMOS70184060010890004309006723

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. 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.


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
15-May-04 Download
AN-1256: Application Note 1256 Tiny Temperature Sensors for Portable Systems 66
Kbytes
1-Oct-02 Download

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[Information as of 7-Nov-2009]