I2C
From ArmadeusWiki
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]
