11- to 14-Bit Digital Temperature Sensor With 2-Wire Interface - LM73-Q1

LM73-Q1 (ACTIVE)

11- to 14-Bit Digital Temperature Sensor With 2-Wire Interface

 

Description

The LM73-Q1 is a digital output temperature sensor featuring an integrated incremental Delta-Sigma ADC. The LM73-Q1 communicates with a two-wire interface that is compatible with SMBus and I2C interfaces, and the host can query the LM73-Q1 at any time to read temperature.

The LM73-Q1 operates over a wide temperature range (–40°C to 125°C) and provides ±1.45°C accuracy from –10°C to 80°C. The LM73-Q1 includes four selectable resolution options that allow the temperature conversion time and sensitivity to be adjusted for optimal performance. The LM73-Q1 defaults to 11-bit mode (0.25°C/LSB), and will measure temperature in a maximum time of 14 ms, making it ideal for applications that require temperature data very soon after power-up. In its 14-bit maximum resolution mode (0.03125°C/LSB), the LM73-Q1 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, the LM73-Q1 has a time-out feature that will automatically reset the clock and data lines, if these lines are held low for an extended period of time. This prevents a bus lock-up condition without requiring host processor intervention.

Features

  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results
    • LM73-Q1 Temperature grade 1: –40°C to 125°C
    • LM73-Q1 HBM ESD Classification Level 2
    • LM73-Q1 CDM ESD Classification Level C6
  • 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
  • Temperature Accuracy: ±1.45°C (Maximum)
  • Temperature Range: –40°C to 125°C
  • Conversion Time
    • 11-Bit (0.25°C): 14 ms (Maximum)
    • 14-Bit (0.03125°C): 112 ms (Maximum)
  • Operating Supply Current: 320 µA (Typical)
  • Shutdown Supply Current: 1.9 µA (Typical)
  • Resolution: 0.25°C to 0.03125°C

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Parametrics Compare all products in Local Digital Temperature Sensors

 
Interface
Local Sensor Accuracy (Max) (+/- C)
Temp Resolution (Max) (bits)
Operating Temperature Range (C)
Supply Voltage (Min) (V)
Supply Voltage (Max) (V)
Supply Current (Typ) (uA)
Supply Current (Max) (uA)
Special Features
Addresses
Rating
Package Group
Package Size: mm2:W x L (PKG)
Iq (Typ) (uA)
LM73-Q1
I2C, SMBus, 2-Wire   
1.45   
14   
-40 to 125   
2.7   
5.5   
320   
550   
Configurable Resolution, Programmable Alert, One-Shot Conversion, Shutdown   
6   
Automotive   
SOT-23-THIN   
6SOT-23-THIN: 8 mm2: 2.8 x 2.9(SOT-23-THIN)   
320   

Other qualified versions of LM73-Q1

Version Part Number Definition
Catalog LM73 TI's standard catalog product