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CC3120MOD: Query on ESD testing procedure as per EN301489-1/17 in report EH731625

Mahendra Rana
Expert 1010 points
Part Number: CC3120MOD
Other Parts Discussed in Thread: CC3120

Dear all,

After reviewing test report EH731625 and setup photo in ESD Test, it seems that : -

1)      TI have kept metallic plate 1 meter away from EUT and performed contact discharge test on metallic sheet (not directly on EUT).

2)      For air discharge TI has performed on usb connecting cable(not directly on EUT). While testing, TI have configured wifi as access point and connect it to laptop, and sending a continues ping command to AP (access point) for checking packet losses and connection status.

 In similar way we have performed ESD test on our PCBA as well and it is passing in category A (CT/CR) i.e. no packet or connection lost during testing and after test.

But as we have placed a plastic top cover having keypad (HMI) on our wifi PCBA. So in our case we have to also perform air discharge test on top plastic cover having keypad.

And during this testing wifi module connection get lost. So it means we are passing it in criteria B category (TT/TR). Although as per standard EN301489-1/17 required passing criteria is B only (TT/TR).

So Can anyone comment that is it we understood correctly, TI testing procedure (means is it by above mentioned procedure TI has performed ESD test on Wifi CC3120MOD)?

And also can anyone suggest that how we can improve our PCBA so that while air discharge test, we will not loss connection or packet.

Regards,

Mahendra Rana

  • 0
    TI__Mastermind 27145 points

    Hi,

    Please note that we used Launchpad ( Open Board - No Enclosure) in ESD testing.

    In your case, it is a complete product in an enclosure.  So, you need to protect all the openings (like opening in the Keypad) against ESD discharge.

    You may need to use ESD diodes on the Keypad connection lines in order to protect from an ESD discharges.

    Thanks,

    PM

  • 0 in reply to PM
    Expert 1010 points

    Hi,

    Agreed with your point but that keypad is connected with my host controller which is not having any effect by ESD and also we have placed ESD suppression diode on all keypad I/O's.

    Wifi CC3120 connected to host controller through SPI and keypad is connected on another mcu input pins so no relation in between this.

    Host controller not having any effect of ESD, I have checked twice. Only Wifi disconnects with mobile while ESD test, as I configured wifi as accesspoint and connected with mobile and run iperf app for packet testing.

    So can you suggest how we can resolve this issue. Also can you review that is it we understood your test method correctly as I mentioned in above thread.

    Regards,

    Mahendra Rana

  • 0 in reply to Mahendra Rana
    TI__Mastermind 27145 points

    Hi,

    Yes, your assumptions are correct.

    According to your description, your product is meeting the requirement of TT/TR - Criteria B. So, you can declare TT/TR - Criteria B is your minimum requirement.

    If you want to pas CT/CR  Criteria then then you need to protect all the conduction paths (open to outside) with ESD circuit which includes Antenna connection.

    You can use Wire Mesh (connect to Gnd) inside the plastic in the openings of your Plastic casing or use Conductive coating inside the Plastic case and  ground the case.

    However, it seems you are discussing the same case with one of my colleague through email. So, please continue your discussion through that channel.

    Thanks,

    PM