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ISO1432: Common ground in isolated transceiver

Harsh Rajoria
Prodigy 20 points
Part Number: ISO1432
Other Parts Discussed in Thread: ISO1410

Do I need to have separate grounds on either side of the ISO1432BDWR isolated UART to RS485 transceiver? Or can they just share the same ground. If they are to be seperated, is it advisable to tie them together at one point for continuous reference throughout the board? I haven't worked with isolated transceivers before so was curious about the good way for grounding in these systems. 

  • 0
    TI__Mastermind 29535 points

    Hello Harsh, 

    Thank you for your question. When designing an isolated system each ground should be kept separate and not connected anywhere in the system. It is also recommended to have a keep-out-zone between side 1 and side 2 pins of the isolator where no metal or components are routed in the PCB layout. 

    These two recommendations are required to have the full isolation performance shown in the datasheet. Each ground plane (side of the isolator) will be completely independent as a result. 

    Figure 52. Application Circuit of ISO1410 shows an example of how to set up the isolator and provide isolated power for proper performance. Please see How to Isolate Signal and Power for an RS-485 System (Rev. C) (ti.com). Also, if you are new to isolated systems, the Precision labs series: Introduction to isolation | TI.com may be helpful as well.

    Let me know if you have further questions. 

    Best,
    Andrew