I've read following valuable article: 'TI Designs: TIDA-01630 High EMC Immunity RS485 Interface Reference Design for Tamagawa Encoders'.
However, I could not find whether 'Earth' (plane under SubD-15 female connector) was connected to GND via R1 and C1 during IEC-61000-4-4 Electrical Fast Transient (EFT) test (shown with figure 18). I realize (figure 19) that TIDA-01630 connector was bonded to metal (RF) plate during test, but would like to know what was the case with R1 and C1 - have they been used (placed on pcb) or not?
If not, how was then circuit GND connected to metal plate ('Earth')?
If yes, how that affect function of C12 and C15 (figure 3) or C19 and C 22 used to further improve immunity to CM disturbances?
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to Martin Staebler:
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.