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LM73

ACTIVE

±1°C Temperature Sensor with I2C/SMBus Interface

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Data sheet

LM73

ACTIVE
Data sheet Order now

Product details

Local sensor accuracy (max) 1 Type Local Operating temperature range (°C) -40 to 150 Supply voltage (min) (V) 2.7 Interface type I2C, SMBus Supply voltage (max) (V) 5.5 Features ALERT, One-shot conversion, UL recognized Supply current (max) (µA) 550 Temp resolution (max) (bps) 14 Remote channels (#) 0 Addresses 6 Rating Catalog
Local sensor accuracy (max) 1 Type Local Operating temperature range (°C) -40 to 150 Supply voltage (min) (V) 2.7 Interface type I2C, SMBus Supply voltage (max) (V) 5.5 Features ALERT, One-shot conversion, UL recognized Supply current (max) (µA) 550 Temp resolution (max) (bps) 14 Remote channels (#) 0 Addresses 6 Rating Catalog
SOT-23-THN (DDC) 6 8.12 mm² 2.9 x 2.8
  • 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)
  • 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)

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.

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.
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Technical documentation

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Type Title Date
* Data sheet LM73 2.7-V, SOT-23, 11- to 14-Bit Digital Temperature Sensor With 2-Wire Interface datasheet (Rev. F) PDF | HTML 29 Oct 2015
Application note How to Read and Interpret Digital Temperature Sensor Output Data (Rev. A) PDF | HTML 21 Jan 2025
Certificate UL Certificate of Compliance Vol1-Sec6 E232195 09 Aug 2018
Application note Applying I2C-Compatible Temperature Sensors in Systems With Slow Clock Edges (Rev. A) 06 May 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Driver or library

LM73SW-LINUX — Linux Driver for LM73

The Linux driver supports the LM73 Temperature Sensor. The Linux driver supports communication through the I2C bus and interfaces with the Hardware Monitoring sub-system.

 

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

Supported Devices:

  • lm73

 

Linux Source Files

(...)

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Support software

DIGITALTEMPSENSORSEVM-SW — Eval Board Software for Hardware Monitors and Digital Temp Sensors

Evaluation Board Software for Hardware Monitors and Digital Temperature Sensors
Supported products & hardware

Supported products & hardware

Products
Digital temperature sensors
  • LM63 — 1 remote and local temperature sensor with fan control
  • LM64 — 1 remote and local temp sensor with fan control and 5 GPIO's
  • LM71 — ±1.5°C Temperature Sensor with SPI Interface
  • LM71-Q1 — Automotive Grade, ±1.5°C Temperature Sensor with SPI Interface
  • LM73 — ±1°C Temperature Sensor with I2C/SMBus Interface
  • LM86 — ±0.75°C remote and local temperature sensor with SMBus interface
  • LM89 — ±0.75°C remote and local temperature sensor with SMBus interface and 2 addresses for bus sharing
  • LM90 — Remote and Local Temperature Sensor with SMBus Interface
  • LM93 — 2 remote, 1 local temp sensor with hardware monitor and 16 power supply voltage monitors
  • LM95010 — ±2°C Temperature Sensor with SensorPath Interface
  • LM95071 — ±1°C Temperature Sensor with SPI Interface
  • LM95221 — ±3°C dual remote & local temperature sensor with beta compensation and SMBus, I2C
  • LM95231 — Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface
  • LM95235 — ±0.75°C remote & local temperature sensor with SMBus, beta compensation for 65/90n
  • LM95235-Q1 — Automotive Grade, ±2°C Remote and Local Temperature Sensor with TruTherm Technology and SMBus
  • LM96000 — Hardware monitor with fan control and 6 power supply voltage monitors
  • LM96080 — 1 local temp sensor with fan speed and power supply voltage monitor
  • LM96163 — 1 remote and local temp sensor with beta compensation and fan control
  • LM99 — Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface
Download
Support software

SENSOREVAL — Eval Board Software For Hardware Monitors And Digital Temperature Sensors

SensorEval
SensorEval software supports the latest TI temperature sensor and hardware monitor evaluation boards via USB interface. It also allows access to sensors mounted directly on motherboards that support Intel chip sets.

  • Download SensorEval Software and Manual
  • Windows XP support is offered for (...)
Supported products & hardware

Supported products & hardware

Products
Digital temperature sensors
  • LM63 — 1 remote and local temperature sensor with fan control
  • LM64 — 1 remote and local temp sensor with fan control and 5 GPIO's
  • LM71 — ±1.5°C Temperature Sensor with SPI Interface
  • LM71-Q1 — Automotive Grade, ±1.5°C Temperature Sensor with SPI Interface
  • LM73 — ±1°C Temperature Sensor with I2C/SMBus Interface
  • LM75A — 2C industry standard temperature sensor, I2C/SMBus interface
  • LM86 — ±0.75°C remote and local temperature sensor with SMBus interface
  • LM89 — ±0.75°C remote and local temperature sensor with SMBus interface and 2 addresses for bus sharing
  • LM90 — Remote and Local Temperature Sensor with SMBus Interface
  • LM93 — 2 remote, 1 local temp sensor with hardware monitor and 16 power supply voltage monitors
  • LM95010 — ±2°C Temperature Sensor with SensorPath Interface
  • LM95071 — ±1°C Temperature Sensor with SPI Interface
  • LM95172-Q1 — Automotive Grade, ±1°C Temperature Sensor with 200°C Capability and SPI Interface
  • LM95214 — ±2°C Quad Remote and Local Temperature Sensor with SMBus Interface
  • LM95221 — ±3°C dual remote & local temperature sensor with beta compensation and SMBus, I2C
  • LM95231 — Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface
  • LM95233 — ±2°C Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface
  • LM95234 — ±2°C Quad Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface
  • LM95235 — ±0.75°C remote & local temperature sensor with SMBus, beta compensation for 65/90n
  • LM95235-Q1 — Automotive Grade, ±2°C Remote and Local Temperature Sensor with TruTherm Technology and SMBus
  • LM95241 — ±1.25°C dual remote & local temperature sensor with beta compensation and SMBus, I
  • LM95245 — ±0.75°C remote & local temperature sensor with SMBus, beta compensation for 45nm d
  • LM96000 — Hardware monitor with fan control and 6 power supply voltage monitors
  • LM96080 — 1 local temp sensor with fan speed and power supply voltage monitor
  • LM96163 — 1 remote and local temp sensor with beta compensation and fan control
  • LM99 — Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface
Precision ADCs
  • ADC128D818 — 12-Bit, 82SPS, 8-Ch Delta-Sigma ADC with Temp Sensor, INT / EXT Voltage Reference & I2C Interface
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Simulation model

LM73 IBIS Model

SNOM464.ZIP (41 KB) - IBIS Model
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Package Pins CAD symbols, footprints & 3D models
SOT-23-THN (DDC) 6 Ultra Librarian
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Information included:
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