This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TCAN1046A-Q1: TI can transceivers and ASIL ratings

Part Number: TCAN1046A-Q1
Other Parts Discussed in Thread: TCAN1145-Q1

Hi Team,

This is Chris Park from TIK and I've a few questions related to TI's CAN and their ASIL ratings.

The products that I'm considering are TCAN1046A-Q1 and TCAN1145-Q1 with functional safety-capable and quality managed respectively.

The customer's application is electric actuator for automotive, and their supply voltage is around 5V. They want ASIL-D with the CAN transceivers.

As far as I know, TI's CAN transceivers can assist in achieving ASIL ratings at the system level, but at the transceiver level they do not have any ASIL rating.

Questions are as below;

1. Does this mean that ASIL ratings could vary by the systems that CAN are applied to?

2. To support ASIL-D with CAN, which device(1046 / 1145) with one channel or two channels is preferred? and which device (capable/quality managed) is preferred?

Thank you.

  • Hi Chris,

    You seem to have a solid understanding of the situation on this so far. While the transceivers themselves do not have an ASIL rating, the information provided in the functional safety (FS) documentation can help the system achieve a desired ASIL rating. This will require the system itself to consider different possible fail cases so the final ASIL rating will depend on several aspects other than the transceivers themselves. I'm not too familiar with particular methods of achieving a system-level ASIL rating, so I can't recommend specific design decisions such as one or two channel CANs as this will depend heavily on the rest of the system. 

    As for the transceiver choice, we offer different documentation for our devices depending on the anticipated needs of FS capabilities. The categories for these and the available info are included on the table shown and linked below. Based on what information is needed by the system to make relevant design decisions for the desired ASIL rating, it may be preferred to choose a device that offers more FS documentation such as the FS Quality-managed category over the FS capable category. 

    Let me know if this clears things up a bit and if you have any more questions.

    Eric Schott