New High-Accuracy Digital Temperature Sensor From ST
The STTS22H has an accuracy of 0.25°C with I2C and SMBus Communication
With typical temperature-reading accuracy of 0.25°C and low operating and standby current,
the STMicroelectronics STTS22H enhances temperature and heat-flow monitoring in asset trackers,
shipping-container loggers, HVAC systems, air humidifiers, refrigerators, building-automation systems,
and smart consumer devices.
The STTS22H is I2C and SMBus 3.0 compliant, and supports flexible operating modes including configurable output data rate (ODR) down to 1Hz, a power-saving one-shot mode, and an interrupt pin that supports SMBus Alert Response Address (ARA). This allows the sensor, as an SMBus slave, to signal the application if a user-programmed upper or lower temperature threshold is exceeded. Programmable I2C/SMBus slave addresses allow up to two STTS22H sensors to share the same bus.
Power consumption is very low, drawing just 2.0µA at 1Hz ODR and 1.75µA during periodic one-shot measurements, helping extend the running time of battery-powered devices. In standby mode with the serial port inactive, the STTS22H draws a mere 0.5µA (typical). The 1.5-3.6V operating-voltage range allows use with various power sources such as a small lithium cell.
The sensor is fast-acting, with conversion time of 5ms, and provides 16-bit temperature data. The package features a metal slug that minimizes thermal resistance to ensure fast settling at the ambient temperature. Devices come factory-calibrated and maintain the 0.25°C typical accuracy from -10°C to 60°C, eliminating any need for user calibration.
Technical Specifications of the STTS22H Temperature Sensor
- Electrical Specifications
- Supply voltage: 1.5 to 3.6 V
- I2C, SMBus 3.0 with ALERT (ARA) support
- Programmable thresholds with interrupt pin
- Supports up to 1 MHz serial clock
- Up to 2 I2C/SMBus slave addresses
- Ultra-low current: 1.75 µA in one-shot mode
- Temperature Sensing Specifications
- Operating temperature -40 °C to +125 °C
- Temperature accuracy (max.): ± 0.5 °C (-10 °C to +60 °C)
- 16-bit temperature data output
The STTS22H is currently available in a UDFN Package and can be ordered from ST in tape and reel packaging.
For more information on the STTS22H Digital Temperature Sensor, visit the ST Web site
STTS22H product page.
The company's Web site address is www.st.com.
[Reprinted with kind permission from STMicroelectronics - Release Date, 9th April, 2019]