SmartElex TMP102 Digital Temperature Sensor

🔍 Overview
The module is based on the TMP102 digital temperature sensor IC, a low-power, high-accuracy digital temperature sensor.
Measures:
Temperature only
Output:
Digital data via I²C interface
Designed for:
Compact and energy-efficient temperature monitoring
👉 It is widely used in embedded and battery-powered systems.
⚙️ Working Principle
🌡️ Semiconductor Bandgap Temperature Sensing
Uses a bandgap-based sensing element
Temperature changes affect internal voltage characteristics
🔄 Digital Conversion
Internal ADC converts analog signal → digital temperature value
Output is directly readable via I²C
👉 No external calibration required.
📊 Measurement Characteristics
Temperature Range
−40°C to +125°C
Accuracy
±0.5°C (typical)
High accuracy in normal operating range
Resolution
12-bit resolution (default)
Up to 0.0625°C precision
⚡ Electrical Characteristics
Supply voltage: 1.4V to 3.6V
Ultra-low power consumption:
~10 µA (active)
~1 µA (shutdown mode)
👉 Ideal for low-power applications.
🔗 Communication Interface
Interface: I²C (two-wire)
Default address: 0x48 (configurable)
👉 Multiple sensors can be used on the same bus.
🧠 Internal Features
✔ Temperature Registers
Stores current temperature data
Readable via I²C
✔ Alert Function
Configurable:
High and low temperature thresholds
Generates alert signal when limits are exceeded
✔ Comparator / Interrupt Modes
Two alert modes:
Comparator mode
Interrupt mode
✔ Shutdown Mode
Reduces power consumption significantly
✔ Fast Conversion
Quick temperature updates
🔄 Operating Behavior
✔ Continuous Measurement
Automatically updates temperature readings
✔ Event Monitoring
Triggers alert on:
Over-temperature
Under-temperature
✔ Stable Output
Digital output minimizes noise effects
🌡️ Environmental Characteristics
Wide operating range: −40°C to +125°C
Stable under varying environmental conditions
⚠️ Limitations
Measures temperature only
Slight delay due to:
Conversion time
Requires proper placement for accurate sensing
🔌 Typical Pin Configuration
VCC → Power supply
GND → Ground
SDA → I²C data
SCL → I²C clock
ALERT → Interrupt output (optional)
🧩 Functional Role
The module acts as a:
Digital temperature sensor
Low-power thermal monitoring device
Threshold-based alert sensor
🏁 Summary
The SmartElex TMP102 Temperature Sensor is a compact and efficient digital temperature sensing module that:
Uses bandgap temperature sensing
Provides I²C digital output
Offers good accuracy (±0.5°C)
Operates with very low power consumption
Supports alert-based temperature monitoring