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ISO1050: Inquire datasheet 9.2 Typical Application

Part Number: ISO1050
Other Parts Discussed in Thread: , ISO1042

Hi Sir,

May I learn from you about ISO1050 datasheet P.22 9.2 Typical Application SCH, why the GND2 need a cap to the PE? 

Is this the Y-cap to immunity CM noise?

If so, how to determine this Y-cap value?

Thank you.

Edward Chen

  • Hi Edward, 

    The capacitor from ISO Ground to Protective Earth in the typical application circuit is optional. There is no such capacitor on the ISO1050EVM (http://www.ti.com/tool/ISO1050EVM) and it operates without issue. 

    Is this for a new design? If so, I would recommend using the ISO1042 for an isolated CAN transceiver. The ISO1042 supports higher data rates, has higher bus fault protection (+/-70V), and a wider common mode range (+/-30V), and a higher isolation rating than the ISO1050. 

    Best regards, 

    Dan