LM73 ±1°C Temperature Sensor with I2C/SMBus Interface | TI.com

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: ±1.0°C (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)

Parametrics

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Part number Order Device type Interface Local sensor accuracy (Max) (+/- C) Temp resolution (Max) (bits) Operating temperature range (C) Supply voltage (Min) (V) Supply voltage (Max) (V) Supply current (Max) (uA) Features Remote channels (#) Addresses Rating Package Group Package size: mm2:W x L (PKG)
LM73 Order now Local     I2C, SMBus, 2-Wire     1     14     -40 to 150     2.7     5.5     550     Configurable Resolution
Programmable Alert
One-Shot Conversion
Shutdown
UL Recognized    
0     6     Catalog     SOT-23-THIN | 6     6SOT-23-THIN: 8 mm2: 2.8 x 2.9 (SOT-23-THIN | 6)    
TMP100 Order now Local     I2C, SMBus, 2-Wire     2     12     -55 to 125     2.7     5.5     75     Configurable Resolution
One-Shot Conversion
Shutdown    
0     8     Catalog     SOT-23 | 6     6SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 6)    
TMP101 Order now Local     I2C, SMBus, 2-Wire     2     12     -55 to 125     2.7     5.5     75     Configurable Resolution
Programmable Alert
Fault Queue
One-Shot Conversion
Shutdown    
0     3     Catalog     SOT-23 | 6     6SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 6)