I2C and SPI over CAT-6 LAN cable?

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I2C and SPI over CAT-6 LAN cable?

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Contributor I

I have a situation where I need to have an I2C master drive multiple I2C slaves over distances of 1 foot to 50 feet. Specifically I want to use CAT-6 shielded cable to run the following:

  • Power: 12v, GND
  • I2C: SDA, SCL
  • SPI: MOSI, MISO, CLK, CS

I'm currently looking at the P82B715 for the I2C bus, but I don't have a solution for the SPI bus.  

 

Also, on the I2C bus, the Master operates at 3.3v while the Slaves operate at 5v. 

 

Questions:

  1. Is there a single chip (or two chip) solution to support the data lines at this distance range?
  2. If we use the P82B715 can the Master and Slave operate at different voltages by just having Vcc-master at 3.3v and Vcc-slave at 5v? 

 

Thanks for the help!

Mark

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NXP TechSupport
NXP TechSupport

Couple of P82B715 or PCA9600 can support this distance with 12V toleration.

You can use level shifter for 3.3V and 5V IIC master and slave communication for example PCA9603.

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