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ISOW1044: regarding Visoin pin

Part Number: ISOW1044
Other Parts Discussed in Thread: ISO1044

I am using ISOW1044 CAN transceiver in my design. I wanted to confirm can I externally connect +5Vdc to Visoin pin? Since I already have a +5Vpower rail in design I do not wish to use the integrated dc dc converter.

Regards,
Devang Khetia

  • Hello Devang,

    Thank you for reaching out. If you are not using the integrated DC-DC converter of ISOW1044 then I would recommend using the ISO1044 (isolated CAN without integrated power).  

    Both VDD and Vio must be powered for normal operation, it is recommended that these are shorted on the PCB. This is outlined in section 10.6.4 Power-Up and Power-Down Behavior: "Both the power converter supply (VDD) and Logic supply (VIO) need to be present for the device to work. If either of them is below its UVLO, both the signal path and the power converter are disabled."

    • To disable the DC-DC, the EN should be shorted to GND.
    • While the DC-DC converter is disabled the state of the MODE pin is "X" or don't care. You can ground this pin. (See Table 10-1. Supply configuration Function Table below).

    I hope this helps.

    Best,
    Andrew

  • Thanks for your help