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BOB-11955

P1-P3
PCA9306 Level Translator Hookup Guide
CONTRIBUTORS: TONI_K
PCA9306 Overview
The PCA9306 is a dual bidirectional voltage translator for the I C-bus and
SMBus. It works at a range of voltages between 1.0 and 5.0V and doesn’t
require a direction pin to function.
PCA9306 Breakout Board
This is a great board for shifting voltages between sensors and your
microcontroller.
Suggested Reading
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Page 1 of 3
These level converters are pretty easy to start using, but you may want to
check out some of the additional reading material below if you are
unfamiliar with logic level shifting or haven’t worked with Arduino boards
prior to this.
• What is an Arduino
•IC
• Logic Levels
• How to Solder
Hardware Hookup
The breakout board has seven pins that need to be connected to function
properly. VREF1, SCL1, and SDA1 all connect to your lower voltage part.
VREF2, SCL2, and SDA2 connect to your higher voltage part. The GND pin
needs to be connected to ground in your system. The final through-hole on
the board labeled NC does not need to be connected to anything.
To connect the board, solder headers into the through-holes, and use
jumper wires between devices. Or, you could just solder some hookup wire
to all your boards.
For this example, we are going to use an Arduino Pro Mini 5V to connect to
an HMC5883L magnetometer breakout board, which runs at 3.3V and
communicates over I C.
Connections:
HMC5883L → PCA9306
•3.3V → VREF1
•SCL → SCL1
•SDA → SDA1
•GND → GND
PCA9306 → Pro Mini (5V)
•VREF2 → 5V
•SCL2 → A5
•SDA2 → A4
Here is a Fritizing diagram showing the actual connections between the
HMC5883L, the PCA9306 breakout and the Pro Mini.
Fritzing diagram showing the connections between the three boards.
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Page 2 of 3
The diagram shows the HMC5883L running off of a 3V power supply, and
the Pro Mini running off of a 5V barrel jack connector. Keep in mind your
power supplies could be different than the ones pictured above (for
example, using a Lipo battery instead of AA batteries), but you will still need
to have a power supply for the lower voltage side of the system and a
separate supply for the higher voltage side.
Once you have the boards physically connected, you are good to go! You
don’t need to use any special code with the PCA9306 board, and you can
simply use any example sketch available for your sensors. In this case, we
are using the example HMC5883.ino sketch.
Going Further
Now that you know how to use the logic level shifter, it’s time to go and use
this in your own project! Check out the additional resources below if you
have any questions, or leave us feedback on the tutorial itself. Best of luck
interfacing with all of your sensors!
Resources
• PCA9306 Datasheet
• Breakout Board Schematic
• Breakout Board Eagle Files
• GitHub Repository
Need more level shifting?! Check out these other level shifting hookup
guides:
• Logic Level Converter Hookup Guide
• Bi-Directional Logic Level Converter Hookup Guide
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P1-P3

BOB-11955

Mfr. #:
Buy BOB-11955
Manufacturer:
SparkFun
Description:
GPS Development Tools Level Translator Breakout - PCA9306
Lifecycle:
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