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 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. Programmable I2C/SMBus slave addresses allow up to two STTS22H sensors to share the same bus.
Power consumption is very low, drawing just 2.0 µA at 1 Hz ODR and 1.75 µA 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 0.5 µA (typical). The 1.5-3.6 V operating-voltage range allows use with various power sources such as a small lithium cell.
The sensor is fast-acting, with conversion time of 5 ms, 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.
The STTS22H is in production now as a compact and low-profile 2.0 mm × 2.0 mm × 0.5 mm 6-lead UDFN, priced at $0.49 for orders of 1000 pieces.
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