SmartElex STTS22H Temperature Sensor Module

🔹 Overview
The SmartElex STTS22H Temperature Sensor Module is a high-accuracy, ultra-low-power digital temperature sensor breakout based on the STMicroelectronics STTS22H IC.
Measures ambient temperature only
Provides fully calibrated digital output via I2C
Designed for precision sensing and low-power embedded systems
🔹 Working Principle
Uses bandgap-based temperature sensing
Internal signal chain:
Temperature → analog signal
ADC conversion → digital value
On-chip processing provides:
Linearized output
Temperature-compensated readings
👉 No external calibration required (factory calibrated)
🔹 Measurement Characteristics
🌡️ Temperature
Range: –40°C to +125°C
Accuracy: ±0.5°C (–10°C to +60°C typical range)
👉 High accuracy suitable for precision monitoring applications
🔹 Electrical Characteristics
Operating Voltage: 1.5V – 3.6V
Typical Supply: 3.3V
Ultra-low current:
~1.75 µA (one-shot mode)
👉 Optimized for battery-powered and IoT devices
🔹 Communication Interface
Protocol: I2C (digital)
Default Address: 0x3C
Selectable Addresses:
0x3C, 0x3E, 0x38, 0x3F
👉 Supports multiple sensors on same I2C bus
🔹 Operating Modes
Free-running mode (continuous measurement)
One-shot mode (single measurement, ultra-low power)
Low ODR mode (reduced sampling rate)
👉 Allows optimization between:
Power consumption
Measurement speed
🔹 Performance Characteristics
Output Data Rate (ODR): configurable (down to 1 Hz)
High stability and repeatability
Fast digital response
🔹 Internal Features
Integrated temperature sensing element
High-resolution ADC
Digital signal processing unit
Factory calibration memory
Interrupt system for threshold alerts
🔹 Functional Capabilities
Continuous temperature monitoring
Threshold-based alert generation
Low-power periodic sensing
🔹 Output Characteristics
Type: Digital temperature data (I2C)
Provides:
Direct temperature value (°C)
No external ADC required
🔹 Breakout Board Features
Built-in I2C pull-up resistors (2.2kΩ)
Connector-based interface (Qwiic / PicoBlade depending on version)
Address selection via jumpers
🔹 Key Technical Features
High accuracy (±0.5°C)
Ultra-low power consumption
Wide temperature range
Multiple I2C addresses
Configurable sampling modes
Built-in interrupt support
Factory calibrated output
🔹 Advantages
No calibration required
Very low power → ideal for IoT
High precision compared to basic sensors
Easy integration via I2C
🔹 Limitations
Measures temperature only (no humidity/pressure)
Accuracy depends on:
Placement
Thermal coupling with environment
Requires proper PCB layout for best precision
🔹 Technical Summary
The STTS22H module is a precision digital temperature sensor that:
Delivers high accuracy with ultra-low power
Provides direct digital output via I2C
Is optimized for battery-powered and embedded applications
👉 Compared to basic sensors (like LM35 or DHT series):
Much higher accuracy
Lower power consumption
Fully digital (no analog noise issues)