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TMS320F28P650DK: TMS320F28P650DK9+DP83826E Electrostatic Test EtherCAT Disconnected

Hui Chen
Intellectual 880 points

Part Number: TMS320F28P650DK
Other Parts Discussed in Thread: DP83826AE, DP83826E

Hi, engineer:
In the EtherCAT system using TMS28P650DK-DP83826E, applying electrostatic interference to PE can cause Ethernet communication to disconnect; We made the following attempts:
During electrostatic testing, the green light controlled by GPIO 59 on TMS320F28P650 and the yellow light controlled by pin 31 on DP83826 are both turned off.
2. Completely separate the internal signal grounding of the entire system from the ground, as static interference from the ground can still cause DP83826 to reset; At this point, there may be a circuit between the AC220V to DC48V power supply and ground. Such a long path with minimal interference may also cause EtherCAT to disconnect.
3. Through the oscilloscope triggering mode, it was not observed that pin 32 RST-N of DP83826 was reset and pulled low.
Problem 1: The entire communication system is highly susceptible to interference, and even small disturbances can cause the system to disconnect. So, do customers using these two chips have similar problems and are there any solutions?
Question 2: If there is no conclusion to question 1, are there any other improvement suggestions or methods?
DP83826.png
  • 0
    Intellectual 880 points

    We have passed the same ESD test on the 28075+LAN9253 platform. However, after upgrading the processor to 28P650 to meet functional safety requirements, the new platform fails to pass this test.

  • 0 in reply to Hui Chen
    TI__Prodigy 10 points

    Hi Hui Chen,

    Please note that due to the holiday season, there may be some delay in responses. 

    regards,

    VeeraHanuman.

  • 0 in reply to VeeraHanuman Kumbha
    TI__Mastermind 41875 points

    Hello,

    I can assist with this query from the PHY team. A few questions:

    - What standard are you testing against?

    - What level and criteria/class is desired?

    - What level is PHY passing up to?

    Sincerely,

    Gerome

  • 0 in reply to Gerome Cacho
    Intellectual 880 points

    Hi Gerome.

    Currently, static electricity testing can only pass 2KV, while board testing requires at least 4KV testing.

    When 4KV testing, applying interference once will cause the PHY chip to turn off the chain light, and then turn it back on after a few seconds.

    Based on our initial attempt, we have recently attempted to replace DP83826E with DP83826AE again. Static electricity testing can withstand four to five interferences, but it is still possible to restart after multiple interferences.

    Sincerely,

  • 0 in reply to Hui Chen
    TI__Mastermind 41875 points

    Hello,

    What standard of static electricity are you testing against? Is it IEC-61000-4-2? ESD testing is typically 10 strikes.

    When you are desiring 4kV testing, what is the desired criteria? Do you need the design to be completely immune (Class A), or are you tolerable to self-recovery (Class B)?

    When replacing DP83826E with DP83826AE, did you see an improvement in performance or net zero?

    Sincerely,
    Gerome