±1°C Temperature Sensor with I2C, SMBus Interface - LM73

LM73 (ACTIVE)

±1°C Temperature Sensor with I2C, SMBus Interface

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 I2C interfaces. The host can query the LM73 at any time to read temperature.

Available in a 6-pin SOT package, the LM73 occupies very little board area while operating over a wide temperature range (–40°C to 150°C) and providing ±1°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.

Features

  • Single Address Pin Offers Choice of Three Selectable
    Addresses Per Version for a Total of Six Possible Addresses.
  • SMBus and I2C-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 Output
  • UL Recognized Component
  • Key Specifications
    • Supply Current
      • Operating
        • 320 µA (Typical)
        • 495 µA (Maximum)
      • Shutdown
        • 8 µA (Maximum)
        • 1.9 µA (Typical)
    • Temperature Accuracy
      • –10°C to 80°C: 495 µA (Maximum)
      • –25°C to 115°C: ±1.5°C (Maximum)
      • –40°C to 150°C: ±2°C (Maximum)
    • Resolution
      • 0.25°C to 0.03125°C
    • Conversion Time
      • 11-Bit (0.25°C): 14 ms (Maximum)
      • 14-Bit (0.03125°C): 112 ms (Maximum)

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Parametrics Compare all products in Digital Output

 
Local Sensor Accuracy (Max) (+/- C)
Temp Resolution (Max) (bits)
Supply Voltage (Min) (V)
Supply Voltage (Max) (V)
Supply Current (Max) (uA)
Interface
Programmable Alert
Shutdown
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM73
1    
14    
2.7    
5.5    
495    
I2C
SMBus    
Yes    
Yes    
One Shot Conversion Control    
Catalog    
-40 to 150    
6SOT    
0.75 | 1ku    
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