I2C: Difference between revisions
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This page will summarize the informations to use the I2C bus on our boards. | 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''' ( | 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 [http://www.nxp.com/acrobat_download/datasheets/PCA9306_2.pdf] | |||
==Links== | ==Links== | ||
* [http://mbouget.club.fr/i2c-faq.html Vincent Himpe I2C FAQ mirror] | * [http://mbouget.club.fr/i2c-faq.html Vincent Himpe I2C FAQ mirror] | ||
Revision as of 20:45, 13 July 2007
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]
