Temperature sensor accurate to 0.25°C

Temperature sensor accurate to 0.25°C


The STTS22H temperature sensor from STMicroelectronics offers high accuracy with low operating and standby current and flexible operating modes. By Gina Roos @ electronicproducts.com

STMicroelectronics has launched its STTS22H temperature sensor with typical temperature-reading accuracy of 0.25°C and low operating and standby current. The device 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 1 Hz, 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, said STMicroelectronics. Programmable I²C/SMBus slave addresses allow up to two STTS22H sensors to share the same bus.

The device offers very low power consumption. It draws only 2.0 µA at 1 Hz ODR and 1.75 µA during periodic one-shot measurements, which extends the runtime of battery-powered devices. In standby mode with the serial port inactive, the STTS22H draws only 0.5 µA (typical). In addition, the 1.5-V to 3.6-V operating-voltage range allows use with various power sources such as a small lithium cell.

The fast-acting sensor offers a conversion time of 5 ms, and provides 16-bit temperature data. Devices come factory-calibrated and maintain the 0.25°C typical accuracy over the temperature range of -10°C to 60°C, eliminating any need for user calibration, according to the company.

The STTS22H, packaged in a 2.0 x 2.0 x 0.5 6-lead UDFN, is priced at $0.49 for orders of 1000 units.

Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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