Texas Instruments LM73/LM73-Q1 Temperature Sensors
Texas Instruments LM73/LM73-Q1 Temperature Sensors are integrated, digital-output temperature sensors featuring an incremental Delta-Sigma ADC with a two-wire interface compatible with the SMBus and I2C interfaces. The host can query the LM73/LM73-Q1 at any time to read the temperature. These devices occupy minimal board area. The LM73 operates over a –40°C to 150°C temperature range and provides ±1°C accuracy from –10°C to 80°C. At the same time, the LM73-Q1 operates over a –40°C to 125°C temperature range and provides ±1.45°C accuracy from –10°C to 80°C. The user can optimize the conversion time and the sensitivity of the LM73/LM73-Q1 by programming it to report the temperature in any of four different resolutions. Defaulting to 11-bit mode (0.25°C/LSB), the LM73/LM73-Q1 measures temperature in a maximum of 14 ms, making it ideal for applications requiring temperature data soon after power-up. In its maximum resolution, 14-bit mode (0.03125°C/LSB), the LM73/LM73-Q1 is optimized to sense minimal temperature changes. The Texas Instruments LM73-Q1 devices are AEC-Q100 qualified for automotive applications.
Features
- Single address pin offers a choice of three selectable addresses per version for total of 6 possible addresses
- SMBus and I2C-compatible two-wire interface
- Supports 400KHz operation
- Shutdown mode with a 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 the temperature is above a programmed temperature limit
- Stable, low-noise digital output
- UL-recognized component
- AEC-Q100 qualified
- Supply current operating
- 320µA (typical)
- 495µA (maximum)
- Shutdown
- 8µA (maximum)
- 1.9µA (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): 14ms (maximum)
- 14-Bit (0.03125°C): 112ms (maximum)
Applications
- Portable electronics
- Notebook computers
- Automotive
- System thermal management
- Office electronics
Functional Block Diagram
Publicado: 2017-07-19
| Actualizado: 2023-10-31