Please ask what causes adm485 to fail to communicate?

1500 sets were produced, and about 80 sets could not be charged normally due to 485 IC problem,

The fault phenomena are as follows:

When the output current of power supply product reaches 30A or above,

Adm485 can not communicate, resulting in the output current of the power supply can not continue to adjust the current through adm485 communication,

After the power supply voltage of adm485 is increased to 4V, the communication is normal (at present, the power supply of adm485 is set to 3.3V)

However, after replacing the adm485 with a new adm485 IC, the power supply voltage is reduced to 3V, and the communication is OK

Please ask what causes adm485 to fail to communicate?


The schematic diagram is as follows:

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  • 1500 sets were produced, and about 80 sets could not be charged normally due to 485 IC problem,

    The fault phenomena are as follows:

    When the output current of power supply product reaches 30A or above,

    Adm485 can not communicate, resulting in the output current of the power supply can not continue to adjust the current through adm485 communication,

    After the power supply voltage of adm485 is increased to 4V, the communication is normal (at present, the power supply of adm485 is set to 3.3V)

    However, after replacing the adm485 with a new adm485 IC, the power supply voltage is reduced to 3V, and the communication is OK

    Please ask what causes adm485 to fail to communicate?

    The schematic diagram is as follows:

  • 0
    •  Analog Employees 
    on Jan 25, 2021 11:10 AM in reply to Clark666

    Hi Clark,

    The ADM485E is specified for a Vcc supply of 4.5-5.5V.  Is there any reason why your design cannot meet this specified range?

    We have a wide range of half duplex RS-485 transceivers that can operate at 3.3V supply ranges, For example the ADM3065E (3V to 5.5V) and ADM3078E (3 to 3.6V).

    Best Regards,

    Shane

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