This is a follow-up question on this answer. I need to communicate with I2C over approximately 10cm and I'd like to use an FFC or IDE cable for that.
Earlier, I used an FFC cable to link a segment LCD screen to a 7106 IC. Some segments flashed a bit, and after some testing I found out that was because of interference between the wires. I used a standard flat IDE connector cable from an old computer for this.
I'd like to know if I2C could have problems with communicating over 10cm of a FFC or IDE cable, when data and clock line are directly next to each other. If so, is there a way to resolve this? Would placing a ground and 5V line in between help?