Difference between revisions of "I2C"
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== Electrical Characteristics == | == Electrical Characteristics == | ||
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| + | The I2C specification limits the I2C bus capacitance to 400pF. The cat5e wire specification limits wire capacitance to 50pF/m, so we should be able to push I2C at least 8m. Testing is needed, but by lowering the bus clock and the pull-up resistors a much greater length should be possible. | ||
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| + | == Task List == | ||
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| + | == Stuff to buy == | ||
| + | 1. Power Supply | ||
| + | 2. Gumstix (x2) | ||
| + | 3. I2C expanders | ||
| + | 4. I2C eproms (for feedback testing) | ||
| + | 5. header pins | ||
Revision as of 18:13, 7 June 2007
Parameters for the operation of the VFAT board are downloaded to the chip using the I2C protocol.
A good overview of I2C is available on wikipedia
Electrical Characteristics
The I2C specification limits the I2C bus capacitance to 400pF. The cat5e wire specification limits wire capacitance to 50pF/m, so we should be able to push I2C at least 8m. Testing is needed, but by lowering the bus clock and the pull-up resistors a much greater length should be possible.
Task List
Stuff to buy
1. Power Supply 2. Gumstix (x2) 3. I2C expanders 4. I2C eproms (for feedback testing) 5. header pins