ISOW1044: regarding Visoin pin

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).
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I hope this helps.

Best,
Andrew