ADUM4221 DT pin connect to 5V(VDDI)

Hello

           Customer use SI8233 on board. We will use ADUM4221 to replace it. Customer don't use DT function of SI8233 and DT pin connect to 5V(VDDI).

           Could ADUM4221/ADUM4221-1 DT pin connect to pull hign (5V) for direct replacement? Or ADUM4221-2 show NC pin but that datasheet show( No Connect. Do not connect to these pins). Does ADUM4221-2 also connect to  pull hign (5V) directly? Or we do not connect to any circuit on DT pin for ADUM4221-2. Thank you. 

BR

Patrick

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  • +1
    •  Analog Employees 
    on Mar 17, 2021 3:51 PM

    Hello Patrick,

    The ADuM4221-2 is the best option here. Pin 6 and 7 are actually not internally connected, so you can pull them to 5V without a problem. The ADuM4221-2 does not have built in deadtime, so deadtime must come from the controller, and the controller must make sure shoot-through does not occur at the power stage.

    The ADuM4221 and ADuM4221-1 cannot have the DT pin pulled up to 5 V. For the ADuM4221 and ADuM4221-1, there can only be a resistor to GND1 placed on the DT pin (pin 6), no voltage source can be applied to pin 6.

    RSchnell

Reply
  • +1
    •  Analog Employees 
    on Mar 17, 2021 3:51 PM

    Hello Patrick,

    The ADuM4221-2 is the best option here. Pin 6 and 7 are actually not internally connected, so you can pull them to 5V without a problem. The ADuM4221-2 does not have built in deadtime, so deadtime must come from the controller, and the controller must make sure shoot-through does not occur at the power stage.

    The ADuM4221 and ADuM4221-1 cannot have the DT pin pulled up to 5 V. For the ADuM4221 and ADuM4221-1, there can only be a resistor to GND1 placed on the DT pin (pin 6), no voltage source can be applied to pin 6.

    RSchnell

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