ADM3065E HOT SWAP

Let me ask you a question about the hot swap feature of the ADM3065E.

The data sheet states that when VCC or VIO rises, DE is kept low and RE is kept high.

Q1:How fast does the VCC or VIO rise correspond?

Q2:

Shorting DE and RE and using it for half-duplex communication
I am wondering if this device can be used.
In that case, I'm worried that this feature will not cause any problems.

Will it be used?



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[edited by: UBOTI at 1:09 AM (GMT -4) on 28 Jun 2021]
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  • +1
    •  Analog Employees 
    on Jun 28, 2021 10:58 AM

    Hi Uboti, 

    There is an undervoltage lockout circuit in the ADM3065E, which keeps the driver disabled (DE = Low) and receiver disabled (RE = High) during powerup, until the VCC voltage of the ADM3065E is at > 2.5V. Once the VCC voltage is powered up at >2.5V, the driver and receiver can be controlled using the DE and RE pins. This feature is independent of the rise time on VCC during powerup. 

    The hotswap circuitry on the ADM3065E functions correctly when DE and RE are connected together, as shown in your figure. 

    Regards,

    Neil 

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  • +1
    •  Analog Employees 
    on Jun 28, 2021 10:58 AM

    Hi Uboti, 

    There is an undervoltage lockout circuit in the ADM3065E, which keeps the driver disabled (DE = Low) and receiver disabled (RE = High) during powerup, until the VCC voltage of the ADM3065E is at > 2.5V. Once the VCC voltage is powered up at >2.5V, the driver and receiver can be controlled using the DE and RE pins. This feature is independent of the rise time on VCC during powerup. 

    The hotswap circuitry on the ADM3065E functions correctly when DE and RE are connected together, as shown in your figure. 

    Regards,

    Neil 

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