3.3v special interest group established.

The CiA (CAN in Automation) association has established the Special Interest Group (SIG) 3,3-V transceivers.

Vikas Thawani (Texas Instruments) chairs this SIG. ECU (electronic control unit) manufacturers are selecting increasingly 3,3-V CAN micro-controllers. In order to avoid two supply voltages, they like to use 3,3-V CAN transceivers instead of the currently dominating 5-V transceivers. Therefore, CiA has established a SIG specifying CAN transceivers powered by a 3,3-V supply.

The scope of the SIG covers the following kinds of CAN transceivers compliant with ISO 11898-2:2024: CAN HS (high speed), CAN FD (flexible data rate), CAN SIC (signal improvement capability), and CAN SIC XL (extended data field length). This includes also transceivers with low-power and selective wake-up capabilities.

A related conformance test plan, an interoperability test plan and an EMC specification are also in the SIG’s scope.

The first specification is covering PMA (physical medium attachment) sub-layer implementations according to the parameter set A and B as given in ISO/FDIS 11898-2:2023. It is intended to release a CiA draft specification proposal (DSP) for 3,3-V CAN transceivers by end of 2024.

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