4 Interoperability (IOPT) of TCAN340x-Q1

As stated in previous section, TCAN340x-Q1 recessive biasing of CANH and CANL terminals is 1.9V. This minor shift in common mode voltage (compared to 2.5V for standard 5V CAN transceivers) falls within the common mode voltage range of −12V to +12V specified in the ISO11898-2 (2024) standard. Also, this minor shift in recessive bias level is inconsequential to the extended ±30V common mode voltage range of the TCAN340x-Q1 when operating at 3.3V, allowing the TCAN340x-Q1 to communicate seamlessly with any other ISO11898-2 compliant transceivers. The TCAN340x-Q1 is fully interoperable with other transceivers on the same bus that are powered by 5V supply.

TI’s TCAN340x-Q1 3.3VCAN transceiver family has been successfully tested by the internationally recognized 3rd party communications and systems group (C&S) to the Interoperability test specification for high-speed CAN transceiver. TCAN340x-Q1 devices have successfully passed homogeneous and heterogeneous network testing, and certificates are available upon request.

In the C&S IOPT tests, TCAN340x-Q1 was tested in a 16-node linear network with all nodes TCAN340x-Q1 (homogeneous network) at 2Mbps and also tested in 8-node homogeneous linear network at 5Mbps. Additionally, 16 node 2Mbps network testing was done under heterogeneous condition (4 nodes being TCAN340x-Q1 and 12 nodes being golden reference 5V CAN transceivers). Similarly, 8 node 5Mbps network was also tested in heterogeneous condition (2 nodes being TCAN340x-Q1 and 6 nodes as golden reference 5V CAN transceivers). Under all network conditions, failures such as CAN bus short to GND, CAN short to battery, ground shift between nodes and disconnection of nodes is intentionally introduced in the network on startup, then failure is removed and communication integrity is checked.

Additionally, TI performed internal testing for various different networks (multi-node complex star topologies) with and without arbitration, and TCAN340x-Q1 passes IOPT under all network conditions.

Below are two waveforms during arbitration for homogeneous (all 5V nodes) and heterogeneous (three TCAN340x-Q1 and 8 standard 5V CAN nodes) 11-node complex triple star network tested at 2Mbps data rate (with 500kbps arbitration). Waveforms clearly demonstrate RXD is received without any errors. Even though bus common mode V_CM movement happens during the frame for heterogeneous condition, differential bus and RXD waveforms remain undisturbed and comparable to all 5V homogeneous network condition.