5 EMC of TCAN340x-Q1

As stated in previous sections, meeting component level EMC is a strict requirement to get CAN transceiver qualified at major car makers. One standard that is used to test and qualify CAN transceivers for EMC is IEC62228-3:2019. This standard tests CAN transceivers for conducted emissions and conducted immunity in a 2-node setup, and for ISO10605 ESD and Pulse transients.

CAN being a differential interface, electromagnetic energy due to differential signals largely gets cancelled out, but any common mode mismatch can show up on cable harnesses and result in significant system level emissions. To meet EMC, significant design effort has been made in TCAN340x-Q1 to keep switching symmetry between CANH and CANL during rising and falling bus transitions. Additionally, proprietary design techniques are implemented in TCAN340x-Q1 that dynamically adjusts the bus common mode while driving and receiving CAN data to meet emissions specifically in heterogeneous networks. Emissions in homogeneous network (where all nodes on CAN bus are 3.3V) is easier to meet compared to the stricter heterogeneous network (mix of 3.3V and 5V CAN node on same bus) because of the movement of common mode during recessive condition.

TCAN340x-Q1 meets strict EMC requirements per IEC 62228-3:2019 under both homogeneous and heterogeneous network conditions and passing reports are available upon request.