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TCAN4550-Q1: Supply question

Maor Matityahu
Intellectual 610 points
Part Number: TCAN4550-Q1
Other Parts Discussed in Thread: TCAN4550

Tool/software:

Hello,

I am using the TCAN4550-Q1. I use this IC in test mode and only use GPIO1, GPIO2 to communicate (not using the CANH, CANL) . These GPIOs goes to isolator and than to TCAN1044 (CAN FD BUS TXVR).

My supplies to the TCAN4550 are 3.3V (VIO) and 27V (VSUP). The consumption from the 27V is couple of mAs, and because this circuit is supplied from batteries i want to consume less power as possible.

Can i supply the TCAN4550 only from 3.3V if i don't use the CANH and CANL and only use GPIOs 1,2?

Thank you

Maor M.

  • 0
    TI__Mastermind 35130 points

    Hi Maor,

    No, the TCAN4550-Q1 is almost completely supplied from the VSUP pin and the device uses internal LDO's to create the 5V and internal digital core voltage rails.  VIO is only used to supply the clock circuit (OSC1 and OSC2 pins) and as a reference voltage for the digital IO level shifters to match the MCU's voltage range.

    The device will not operate if VSUP is not provided or lower than recommended minimum levels.

    Regards,

    Jonathan