Difference between revisions of "I2C"
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==Tested I2C chips== | ==Tested I2C chips== | ||
* RTC | * RTC | ||
| + | * DAC (MAX5821) | ||
| + | * CH7024 | ||
==APF9328 I2C bus logic level adaptation (if necessary)== | ==APF9328 I2C bus logic level adaptation (if necessary)== | ||
Revision as of 18:08, 26 August 2007
This page will summarize the informations to use the I2C bus on our boards.
Tested I2C chips
- RTC
- DAC (MAX5821)
- CH7024
APF9328 I2C bus logic level adaptation (if necessary)
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, for example a PCA9306 from NXP (ex 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.
This chip is the one that will be used on the DevFull board.
