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Running multiple EVAL-ADT7x20EBZ Eval Boards

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I am trying to use 5 ADT7x20 Eval Boards(with adt7420 external board) to monitor the temperature at 5 locations within a room. However, when I connect more than one ADT7x20 to the computer via the usb cable and run the software, sometimes it shows "USB communication failed".

 

ADT_temp_eval_board_error.png

However, this error sometimes do not show up if I changed the sequence of plugging in usb ports and opening up new process of the software. Moreover, this error sometimes show up and sometimes do not even if I follow that exact same sequence. Is there any way to reliably operate more than one of these Eval Boards?

 

Thanks


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