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 temperatu'C

No external calibration required.

Measurement Characteristics

Temperature Range

• 40C to +125C

Accuracy

• 0.5C (typical)

• High accuracy in normal operating range

Resolution

• 12-bit resolution (default)

• Up to 0.0625C precision

Electrical Characteristics

• Supply voltage: 1.4V to 3.6V

• Ultra-low power consumption:

  • ~10 A (active)

  • ~1 A (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-tul

  • Digital output minimizes noise effects

   

  Environmental Characteristics

  • Wide operating range: 40C to +125C

  • 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 sensorThreshold-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 (0.5C)

  • Operates with very low power consumption

  • Supports alert-based temperature monitoring