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Fermion: MCP9808 High Accuracy I2C Temperature Sensor
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Compared to DS18B20, LM35, and other common temperature sensors, the MCP9808 is one of the more accurate temperature sensing options, with a typical accuracy...
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Compared to DS18B20, LM35, and other common temperature sensors, the MCP9808 is one of the more accurate temperature sensing options, with a typical accuracy of ±0.25°C and maximum accuracy of ±0.5°C over the sensor's -40°C to +125°C range and precision of +0.0625°C.
The MCP9808 comes with user-programmable registers that allow user-selectable settings such as Shutdown or Low-Power modes and the specification of temperature Alert window limits and critical output limits. When the temperature changes beyond the specified boundary limits, the MCP9808 outputs an Alert signal. The user has the option of setting the Alert output signal polarity as an active-low or active-high comparator output for thermostat operation, or as a temperature Alert interrupt output for microprocessor-based systems.
These features make the MCP9808 ideal for sophisticated, multi-zone, temperature-monitoring applications.
LabelDescription
| VCC | Power Positive
| GND | Power Negative
| SCL | Clock line
| SDA | Data line
| ALT | Alert
| A0 | I2C Address Configuration Pin
| A1 | I2C Address Configuration Pin
| A2 | I2C Address Configuration Pin
Connection Diagram
Features
High-temperature detection accuracy ±0.25°C/±0.5°C (typical/maximum)
Wide temperature detection range from -40°C to +125°C
Applications
Industrial Freezers and Refrigerators
Food Processing
Personal Computers and Servers
PC Peripherals
Consumer Electronics
Specification
Operating Voltage: 2.7~5.5V
Operating Current: 200μA (typical)
Accuracy:
±0.25°C (typical) from -40°C to +125°C
±0.5°C (maximum) from -20°C to 100°C
±1°C (maximum) from -40°C to +125°C
±0.25°C (typical) from -40°C to +125°C
±0.5°C (maximum) from -20°C to 100°C
±1°C (maximum) from -40°C to +125°C
User-Selectable Measurement Resolution: +0.5°C, +0.25°C, +0.125°C, +0.0625°C
User-Programmable Temperature Alert: Temperature Threshold Alert, Critical Temperature Alert
Communication Interface: I2C (2.54mm Breakout)
Dimension: 18.5×23mm/0.73×0.91"
Mounting Hole Size: 2mm
Mounting Hole Pitch: 18mm
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Fermion: MCP9808 High Accuracy I2C Temperature Sensor x1
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- DS18B20
- A common digital temperature sensor often sold in waterproof probe form. It matters here because the kit does not include temperature measurement, and a DS18B20 is the suggested add-on if your water readings need temperature context.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- I2C address
- An I2C address is the number a device uses so a microcontroller can tell it apart from other devices on the same I2C bus. It matters because two devices with the same fixed address may conflict if used together.
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