PCA9617 Distance: 10m

[yuji0935]

I'm thinking of using two PCA9617A, with a master-slave distance of 10m. Is this ok according to the specs?
One PCA9617 will be connected directly to the master board, and the other one will be placed very close to the slave board.

[guoweisun]

HI yuji0935

For the high speed 10m I recommend the differential I2C-bus buffer  PCA9614/9615

[yuji0935]

Thank you for recommending PCA9614/9615 for high speed. However, this time I'm limiting the communication speed to 100kHz. In that case, can I use PCA9617?

[guoweisun · Accepted solution]

The typical blue Cat5e communication cable is about 46 pF/m

Your usage 10m capacitance + PCA9617 Cio should be less 4000pF,if low speed should be OK.

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2 channel, bidirectional buffer isolates capacitance and allows 540 pF on either side of
the device at 1 MHz and up to 4000 pF at lower speeds

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Thanks!