±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 (Typ) (uA)
Supply Current (Max) (uA)
Interface
Special Features
Addresses
Iq (Typ) (uA)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM73
1    
14    
2.7    
5.5    
320    
550    
I2C, SMBus, 2-Wire    
Configurable Resolution
Programmable Alert
One-Shot Conversion
Shutdown Power Mode    
6    
320    
Catalog    
-40 to 150    
6SOT    
0.75 | 1ku    
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