7Semi MCP9808 I2C Temperature Sensor Breakout

Overview

The module is based on the MCP9808 high-accuracy temperature sensor IC, a precision digital temperature sensor.

• Measures:

  • Temperature only

   

• Provides:

  • High-resolution digital output via I2C

   

• Designed for:

  • Applications requiring very high temperature accuracy

   

It is known for excellent accuracy and stability compared to typical sensors.

Working Principle

Semiconductor Bandgap Sensing

• Uses a bandgap-based temperature sensing circuit

• Temperature changes affect semiconductor properties

• Converted into a precise electrical signal

Digital Conversion

• Inte> converts signal digital data

• Output is calibrated temperature value

No external calibration required.

Measurement Characteristics

Temperature Range

• 40C to +125C

Accuracy

• 0.25C (typical)

• Up to 0.5C max over wide range

Resolution

• Configurable:

  • Up to 0.0625C (12-bit resolution)

   

Suitable for precision temperature monitoring systems.

Electrical Characteristics

• Supply voltage: 2.7V to 5.5V

• Low power consumption:

  • Active mode: low current

  • Shutdown mode: ultra-low current

   

Communication Ion)

Base address: 0x18 (configurable up to 8 addresses)

Supports multiple sensors on same bus.

Internal Features

High Accuracy Calibration

• Factory calibrated

• Maintains accuracy across temperature range

Configurable Resolution

• Trade-off between:

  • Conversion time

  • Precision

   

Temperature Limits & Alerts

• Programmable:

  • Upper and lower temperature thresholds

   

• Generates alert/interrupt output

Hysteresis Control

• Prevents rapid toggling near threshold

Low Power Modes

• Sleep/shutdown modes for energy saving

Operating Behavior

Continuous Measurement

/ul

Event Monitoring

• Triggers alert when:

  • Temperature exceeds set limits

   

Stable Output

• Low noise and high repeatability

Environmental Characteristics

• Wide operating range: 40C to +125C

• Stable performance in varying conditions

Limitations

• Measures temperature only

• Requires:

  • Proper placement for accurate readings

   

• Slight delay due to:

  • Digital conversion time

   

Typical Pin Configuration

• VCC Power supply

• GND Ground

• SDA I2C data

• SCL I2C clock

onal Role

The module acts as a:

• High-precision temperature sensor

• Digital thermal monitoring device

• Threshold-based alert sensor

Summary

The 7Semi MCP9808 breakout is a high-accuracy temperature sensing module that:

• Uses bandgap semiconductor sensing

• Provides digital I2C output

• Offers 0.25C accuracy with high resolution

• Supports alerts and configurable thresholds

• Is optimized for precision temperature monitoring applications