I2C

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This page will summarize the informations to use the I2C bus on our boards.

On the APF9328 the I2C bus has a 3,3V logic level so if you want to use 5V I2C devices you have to add a level converter

Here is a proposition: PCA9306 from NXP (philips)

  • Connect pin 1 to the local GND
  • Connect pin 2 to the local 3.3V
  • Connect pin 3 to the SCL output of the APF
  • Connect pin 4 to the SDA input/ouput of the APF
  • Connect pin 7 and 8 together and the add a 200K resistor in parallel to a 100nF capacitor to GND
  • Connect a pullup of 1.7K to the 5V SCL line (pin 6)
  • Connect a pullup of 1.7K to the 5V SDA line (pin 5)

For more details, take a look at the PCA9306 datasheet [1]



Links

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