ADuM1250

When I leave one side open (e.g. pins 1,2,3,4 or 5,6,7,8 not connected),

can I assume that SDA and SCL of the other side are off (high impedance)?

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  • Hi berardr,

    That'c correct. They will be HiZ when the opposite side is unpowered. 

    Just be aware, it is possible to power up side 1 through the ESD diodes on SDA1 and SCL1. So if there is no power at VDD1, but there is a high on the bus, side 1 can power up. 

    If you want to turn off power to the ADuM1250 on a live bus, use side 2. It can't be powered up through SDA2 and SCL2.  

    Regards,

    Jason

Reply
  • Hi berardr,

    That'c correct. They will be HiZ when the opposite side is unpowered. 

    Just be aware, it is possible to power up side 1 through the ESD diodes on SDA1 and SCL1. So if there is no power at VDD1, but there is a high on the bus, side 1 can power up. 

    If you want to turn off power to the ADuM1250 on a live bus, use side 2. It can't be powered up through SDA2 and SCL2.  

    Regards,

    Jason

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