Hi @trapdoor,
I2C --> cms (depends on speed);
the maximum bus length of an I2C link is about 1 meter at 100
Kbaud, or 10 meters at 10 Kbaud.
ref: I2C Bus Range and Electrical Specifications, Freescale 9S12 HCS12 MC9S12 I2C Hardware =So%20the%20maximum%20bus%20length,within%20an%20otherwise%20shielded%20enclosure
RV mineirin