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TMS570LC4357: Using CAN2.0 speeds above 1Mbit/s

Theo Keinarth
Prodigy 150 points
Part Number: TMS570LC4357
Other Parts Discussed in Thread: AM2634-Q1, TCAN4551-Q1, TCAN4550-Q1, , TCAN3404-Q1

Hi TI Team

We are looking for a lockstep MCU for our SIL3 PLC that, if it was perfect would have 4x CAN-FD modules. I know there is the new AM2634-Q1 but we would like to have a simple one without the need of an external flash. The TMS570LC4357 seems perfect except for the missing CAN-FDs. One solution would be the usage of four TCAN4550-Q1/TCAN4551-Q1 ICs. But we had another idea. Since the newer generation of CAN transceivers can handle data rates up to 8 Mbit, work with 3.3V (TCAN3404-Q1) and we have only multiple TMS570LC4357 on that bus we thought of "overclocking" the CAN2.0 Modules in the MCUs to like 4 Mbit or even 8 Mbit. We 

So my question is if the CAN2.0 modules in the TMS570LC4357 are limited to 1 Mbit or is it possible to "overclock" them.

Regards Theo

  • +1
    TI__Mastermind 45780 points

    Hi Theo,

    Definitely overclocking is not a good idea.

    We never tested but it is not recommended from our side, the robustness of the CAN module guaranteed to max of 1Mbps only.

    My suggestion will go for external CAN transceiver if your application requires more than 1Mbps.

    --

    Thanks & regards,
    Jagadish.