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knownlimitations.md: describe solution for I2C capacitance issue on Edison

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Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
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Mihai Tudor Panu 2017-05-09 12:44:48 -07:00
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@ -94,10 +94,9 @@ This affects the **DS18B20**, **DS2413** and **DFREC** drivers.
Some *I2C* sensors add too much capacitance to the SDA line of the Intel Edison Some *I2C* sensors add too much capacitance to the SDA line of the Intel Edison
Arduino breakout board, thus the signal sticks to a logic 1. When this happens, Arduino breakout board, thus the signal sticks to a logic 1. When this happens,
other sensors connected to the I2C bus are unusable. While there is no generic other sensors connected to the I2C bus also become unusable. In order to solve
solution for this limitation, in most cases the sensor works on the Intel this problem, an I2C repeater that isolates the capacitance on the bus, such as
Edison Mini-breakout. When this board is not an option, the sensor can be the PCA9517 can be used.
sometimes replaced with the same model from a different vendor.
The Intel Edison *SPI* bus can corrupt data being sent across when certain The Intel Edison *SPI* bus can corrupt data being sent across when certain
sensors are connected to it, if using an old image. This has been resolved with sensors are connected to it, if using an old image. This has been resolved with