STTS22HTR Alternatives Features Applications

9/18/2025 4:43:28 PM

STTS22HTR Overview

The STTS22HTR from STMicroelectronics is a high-accuracy, ultra-low-power digital temperature sensor built for modern applications where size and efficiency matter. With an operating range from −40 °C to +125 °C and a typical accuracy of ±0.5 °C between −10 °C and +60 °C, it delivers reliable thermal monitoring. The sensor outputs 16-bit resolution measurements through an I²C/SMBus interface, supporting programmable thresholds and interrupt functions for system integration. Its compact 6-lead UDFN package (2.0 × 2.0 × 0.50 mm) makes it ideal for space-constrained designs.

Designed for efficiency, the STTS22HTR consumes as little as 1.75 µA in one-shot mode, enabling longer battery life in portable and IoT devices. Factory calibration ensures out-of-the-box accuracy, while compliance with ECOPACK and RoHS standards makes it a sustainable choice. From wearables to smart home systems and industrial controls, this sensor adapts to a wide variety of applications requiring dependable thermal data.

If you are interested in purchasing the STTS22HTR, feel free to contact us for pricing and availability.

STTS22HTR Manufacturer

The STTS22HTRis made by STMicroelectronics is a global semiconductor leader, established in 1987 through the merger of France's Thomson Semiconducteurs and Italy's SGS Microelettronica. Legally incorporated in the Netherlands and operationally headquartered in Plan-les-Ouates, near Geneva, Switzerland, ST operates as an integrated device manufacturer (IDM), managing the full semiconductor value chain from research and design to wafer fabrication, packaging, and worldwide sales and support.

STTS22HTR Features

• High-Accuracy Temperature Sensor – Integrated, factory-calibrated device ensuring reliable measurements.

• Accuracy – ±0.5 °C typical from −10 °C to +60 °C; up to ±1.0 °C from −40 °C to +125 °C.

• Digital Output – Provides 16-bit temperature data for precise monitoring.

• Interface – I²C / SMBus 3.0 with ALERT/INT pin for programmable threshold interrupts.

• Configurable Addresses – Supports multiple I²C/SMBus slave addresses via the "Addr" pin.

• Low Power Consumption – ~1.75 µA in one-shot mode, with additional low-power operating modes.

• Wide Supply Range – Operates from 1.5 V to 3.6 V for flexibility in system integration.

• Extended Operating Range – Reliable functionality across −40 °C to +125 °C.

• Compact Package – 6-lead UDFN (2.0 × 2.0 × 0.50 mm) with exposed pad for thermal performance.

• Environmental Compliance – ECOPACK and RoHS-certified for sustainable design.

STTS22HTR Applications

• Wearable Devices – Fitness trackers, smartwatches, and other health-monitoring gadgets.

• Smart Home Automation – Thermostats, air humidifiers, and connected household systems.

• Asset And Goods Tracking – Monitoring location and conditions of valuable items in transit.

• Smartphones And Portable Devices – Integration in handheld electronics and consumer gadgets.

• HVAC Systems – Heating, ventilation, and air-conditioning control and monitoring.

• Home Appliances – Refrigerators and other white goods requiring temperature management.

• Thermostats And Climate Control – Precision regulation of indoor temperature and environmental conditions.

STTS22HTR Issues and Solution

• I²C Address Confusion – Happens when an unsupported address is selected; fix by wiring the Addr pin correctly per the datasheet.

• Invalid Or Zero Readings – Sensor may show 0 °C if read too early or from the wrong register; resolve by waiting ~12 ms after power-up and using correct register access with auto-increment.

• Library Or Driver Errors – Failures occur when the wrong I²C bus instance is used; fix by initializing the correct interface and verifying pull-up resistors.

• Power Supply Instability – Malfunction arises if VDD is out of range; prevent by keeping supply between 1.5–3.6 V, adding decoupling capacitors, and ensuring stable sequencing.

• Clock Stretching / Timing Issues – Some hosts fail if clock stretching is not supported; resolve by configuring SMBus/I²C timing parameters correctly in firmware.

• Interrupt Misconfiguration – ALERT/INT pin may not trigger as expected; fix by enabling threshold registers and verifying polarity/active mode in software.

• Thermal Self-Heating – Prolonged conversions or high activity can raise local sensor temperature; reduce by using one-shot mode or lowering sampling frequency.

• PCB Layout Noise Interference – Crosstalk or long traces can corrupt signals; minimize by keeping I²C lines short, using ground planes, and proper shielding.

STTS22HTR Advantages and Disadvantages
Advantages

• Wide Supply Voltage Range – Operates from 1.5 V to 3.6 V, ideal for low-power and battery-driven systems.

• Ultralow Power Consumption – Uses only ~1.75 µA in one-shot mode, extending battery life when continuous sampling is unnecessary.

• High Resolution – Provides 16-bit digital output, enabling fine temperature measurement granularity.

• Strong Accuracy – Achieves ±0.5 °C typical accuracy across −10 °C to +60 °C.

• Flexible Interface – I²C/SMBus compatibility with up to four selectable addresses via the Addr pin for multi-sensor setups.

• Compact Form Factor – Small UDFN-6 package (2.0 × 2.0 mm) supports space-constrained and portable designs.

Disadvantages

• Reduced Accuracy At Extremes – Accuracy decreases to ±1.0 °C across the full −40 °C to +125 °C range.

• Startup Delay – Requires ~12 ms after power-up before the first valid measurement is available.

• Higher Power In Continuous Modes – Active measurement can draw up to 120–180 µA, impacting efficiency in always-on applications.

• Addr Pin Sensitivity – Incorrect wiring may cause I²C conflicts or invalid data, adding PCB design complexity.

• Interrupt Handling Overhead – ALERT/INT pin is open-drain, requiring external pull-ups and additional software management.

Conclusion
The STTS22HTR combines accuracy, low power use, and compact design, making it well-suited for today's energy-efficient and space-limited devices. While it has some limitations, its benefits make it a reliable option for a wide range of uses. With strong support from STMicroelectronics and alternatives available, it offers flexibility.

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STTS22HTR Alternatives Features Applications