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Small green rectangular circuit board with surface-mount chip and header pins

Adafruit

Adafruit MCP9808 High Accuracy I2C Temperature Sensor Breakout engineering development tool

SKU CH-W828-4QCJ8

High-precision I2C temperature sensor breakout with ±0.25°C typical accuracy from -40°C to 125°C, supporting up to eight devices on one bus and 2.7V to 5.5V logic

  • TypePrototyping Products
  • Precise readings with ±0.25°C typical accuracy over -40°C to 125°C range
  • Fine detail detection at 0.0625°C resolution for sensitive monitoring
  • Connect up to 8 sensors on one I2C bus using adjustable address pins
  • Low 200 µA typical current draw suits battery-powered projects
  • Compact 25.4mm x 17.6mm board fits tight enclosures

High-Accuracy I2C Temperature Breakout

The Adafruit MCP9808 breakout board provides a digital temperature sensor with 0.25°C typical precision across a -40°C to 125°C range. It communicates over a standard I2C interface and operates from 2.7V to 5.5V logic levels. The board includes mounting holes and pull-down resistors for the three address pins.

Makers needing multiple sensors on one bus

Developers who require up to eight sensors on a single I2C bus can use the adjustable address pins to avoid collisions. The 0.0625°C resolution suits data-logging and environmental monitoring projects. This board is not for users who need a through-hole package or an analog output signal.

Verify I2C support and voltage compatibility

Confirm your microcontroller supports standard I2C communication and can operate within the 2.7V to 5.5V logic range. Ensure your firmware can handle the 7-bit addressing scheme for multiple devices. Check that the 25.4mm by 17.6mm board dimensions fit your enclosure or breadboard layout.

Points forts

  • Precise readings with ±0.25°C typical accuracy over -40°C to 125°C range
  • Fine detail detection at 0.0625°C resolution for sensitive monitoring
  • Connect up to 8 sensors on one I2C bus using adjustable address pins
  • Low 200 µA typical current draw suits battery-powered projects
  • Compact 25.4mm x 17.6mm board fits tight enclosures

Caractéristiques

TypePrototyping Products

Questions sur cet article

What microcontroller and wiring does the MCP9808 breakout need to operate?

Any microcontroller with a standard I2C bus works; the board runs on 2.7V to 5.5V logic and includes pull-down resistors for the three address pins.

Can the MCP9808 share an I2C bus with older 5 V I2C devices I already have?

Yes — the sensor’s 2.7V to 5.5V logic range lets it sit on the same bus as 5 V peripherals, and up to eight MCP9808 boards can coexist using the adjustable address pins.

How do I confirm the sensor is reading correctly after wiring it up?

Read the I2C registers; you should see a resolution of 0.0625 °C and typical accuracy of ±0.25 °C across the -40 °C to 125 °C range.

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