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Is the dynamic power consumption difference significant for a uC, if it has to raise its activity on the chosen bus protocol from, lets say 50% to 100%?

I look in overall to the uC+CommController+Transceiver consumption.

Is this a mostly a general rule, or there are exceptions?

Post edit:

For an exemplary calculation, I would say the following setup:

  • Infineon Tricore TX family MCU (tx29)
  • TJA 1081B Flexray Transceiver OR TJA 1145 CAN FD transceiver
  • 100-120 ohm impedance ensured in physical layer
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  • \$\begingroup\$ Wouldn't that depend how much of the bus protocol circuitry makes up the MCU? And how computationally intensive it is? \$\endgroup\$ – DKNguyen Feb 13 at 15:41
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    \$\begingroup\$ Plus things like drive power and terminations. \$\endgroup\$ – Brian Drummond Feb 13 at 15:42
  • \$\begingroup\$ Not only is this MCU dependent (as noted) but also implementation dependent including the chosen drive strength of the output pins as an example. \$\endgroup\$ – Peter Smith Feb 13 at 15:44
  • \$\begingroup\$ What's a "chosen bus protocol"? CAN? \$\endgroup\$ – Lundin Feb 13 at 15:52
  • \$\begingroup\$ I completed the question with specifics, but being generally implementation dependent (the significance of difference), I half obtained my response :) \$\endgroup\$ – VioletVynil Feb 14 at 7:58

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