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Inquiry regarding reset phenomenon during ESD test of Remocon PCB made with nRF52832

David_Kim

hi.

We are making a Remocon PCB with nRF52832 and conducting electrical tests.

There are no major problems in other tests, but there is a reset phenomenon in ESD.

4kV is used as a contact standard, but no matter where the remote control case radiates, it is reset.

So, I am guessing that it may be entered by using the button (tact switch) on the remote control.

Is there any guide document related to this?

Is it possible to make it private and review the artwork and circuit diagram?

thank.

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  • +1

    Hello,

    We are not much involved with ESD qualification on an end-product level, we test our chips on a chip level. There is quite a difference in the voltages and resistances on an end-product compared to the chip level testing. If you have an issue with an ESD on your end-product you likely should contact third party consultants that are specialists on doing a design with focus on ESD performance.

    It might be you need to consider traces, grounding, vias, shielding of connector/casing/housing, decoupling, protection diodes etc. and we don't have the expertise on a product level to give good guidelines on what exactly is the likely problematic part of the design here.

    I believe for instance the vendors of ESD protection diodes do provide recommendations on where and how to place the components to achieve the best performance, so maybe you can get in contact with them also. Check out online ESD guidelines for PCB designs.

    All that said:

    The operating conditions in the nRF52832 product specification specify the electrical parameters that we guarantee functional operation. We do not guarantee functional operation outside of these electrical parameters:
    https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/recommended_op_conditions.html 

    In this case it seems that some voltage exceed the operating conditions, in which case the absolute maximum ratings apply:
    https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/abs_max_ratings.html 

    The absolute maximum ratings specify: "Maximum ratings are the extreme limits to which the chip can be exposed for a limited amount of time without permanently damaging it. Exposure to absolute maximum ratings for prolonged periods of time may affect the reliability of the device.”

    Best regards,
    Kenneth

Reply
  • +1

    Hello,

    We are not much involved with ESD qualification on an end-product level, we test our chips on a chip level. There is quite a difference in the voltages and resistances on an end-product compared to the chip level testing. If you have an issue with an ESD on your end-product you likely should contact third party consultants that are specialists on doing a design with focus on ESD performance.

    It might be you need to consider traces, grounding, vias, shielding of connector/casing/housing, decoupling, protection diodes etc. and we don't have the expertise on a product level to give good guidelines on what exactly is the likely problematic part of the design here.

    I believe for instance the vendors of ESD protection diodes do provide recommendations on where and how to place the components to achieve the best performance, so maybe you can get in contact with them also. Check out online ESD guidelines for PCB designs.

    All that said:

    The operating conditions in the nRF52832 product specification specify the electrical parameters that we guarantee functional operation. We do not guarantee functional operation outside of these electrical parameters:
    https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/recommended_op_conditions.html 

    In this case it seems that some voltage exceed the operating conditions, in which case the absolute maximum ratings apply:
    https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/abs_max_ratings.html 

    The absolute maximum ratings specify: "Maximum ratings are the extreme limits to which the chip can be exposed for a limited amount of time without permanently damaging it. Exposure to absolute maximum ratings for prolonged periods of time may affect the reliability of the device.”

    Best regards,
    Kenneth

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