MCP9808 - high precision I2C temperature sensor - Adafruit 1782

Description

Module with digital temperature sensorMCP9808 equipped with a communications I2C interface (TWI). Pins are the popular goldpin connectors, to connect the sensor to the main module (e.g. Raspberry PiorArduino) viawires.

 

The product is compatible with Arduino

The manufacturer providessample codealong with the connection scheme for users ofArduino.

 

 

Pins

 

Pin Description VDD Supply voltage in the range from 2.7 V to 5.5 V. GND The ground of the system. SCL Clock line of the I2C bus (installed resistor pulling-up 10 kΩ). SDA The data line of the I2C bus (installed resistorpulling-up 10 kΩ). ALERT The external interrupt of open collector type. A0, A1, A2

Pins of address selection of I2C bus. Default adress is: 0x18. Indicating the high status on a single bit will lead to the change of address in accordance with patterns: 0x18 + A2 + A1 + A0.

For example, when indicating a high statusn on all bits, the address will be: 0x18 + 4 + 2 + 1.

When we indicate a high status only on A2 and A0, then: 0x18 + 4 + 1 = 0x1D.

 

Specification

• Supply voltage: from 2.7 V to 5.5 V
• Pins are working with logic of 3.3 V and 5 V
• Measuring range: -40°C to 125°C
• Accuracy: on average - 0.25 °C, maximum 0.5°C
• Resolution: 8-bit ( 0,0625°C)
• Communication interface: I2C (TWI)
• Built-in resistors pulling-up the SCL and SDA 10 kΩ lines
• The bus address: from 0x18 to 0x1F
• Dimensions: 21 x 13 x 2 mm
• Weight: approx. 1 g

 

The set includes:

• Module with temperature sensor
• Goldpin strap, pitch of 2.54 mm for self-soldering

 

Useful links

• The website of the manufacturer: Adafruit 1782
• Example of connecting to Arduino
• The project in Python language
• Service using the converter FT232H
• Documentation of the sensor