Datasheet

Pinouts

The MCP9808 is a very straight-forward sensor, lets go thru all the pins so you can

understand what you need to connect to get started

Power Pins

VDD - This is the positive power and logic level pin. It can be 2.7-5.5VDC, so fine for

use with 3 or 5V logic. Power VDD with whatever logic level you plan to use on the i2c

lines.

GND - this is the ground power and logic reference pin.

I2C Data Pins

SCL - this is the I2C clock pin. There's a 10K pull-up already on the board, so connect

this directly to the i2c master clock pin on your microcontroller

SDA - this is the I2C data pin. There's a 10K pull-up already on the board, so connect

this directly to the i2c master data pin on your microcontroller

Optional Pins

These are pins you don't need to connect to unless you want to!

Alert - This is the interrupt/alert pin from the MCP9808. The chip has some capability

to 'alert' you if the chip temperature goes above or below a set amount. This output

can trigger to let you know. It is open collecto r so you need to use a pull-up resistor

if you want to read signal from this pin.

A0 A1 A2 - These are the address select pins. Since you can only have one device

with a given address on an i2c bus, there must be a way to adjust the address if you

https://learn.adafruit.com/adafruit-mcp9808-precision-i2c-temperature-

sensor-guide

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