Thanks Gerald. I will look into that and report back in the New Year... On Tuesday, 23 December 2014 15:30:29 UTC, Gerald wrote: > > You need to make sure that there is an earth ground on your power supply. > The case of the USB connectors go to the common point ground, which is a > zero ohm resistor by default to the DC ground input. > > Gerald > > > On Tue, Dec 23, 2014 at 5:40 AM, <[email protected] > <javascript:>> wrote: > >> Thanks for the prompt response Gerald. >> >> The beagle has been designed into a system which is in a plastic and >> metal enclosure. The only I/O it has to the outside (other than >> touchscreen) is 2 USB connections. >> >> These connections are what are prone to the 4kv ESD. A discharge on the >> shell of the USB connector causes the micro to reset. This occurs even >> though ESD suppression has been designed in at the USB connectors. >> >> The micro seems particularly prone to this phenomenon. ESD is an awkward >> problem to solve, there isn't one solution to fit all and things such as >> enclosure design can have an influence... >> >> On Monday, 22 December 2014 19:42:37 UTC, Gerald wrote: >>> >>> I am not sure what was used, other than putting it in a box or adding >>> ESD protection devices on every point on the board likely to be touched by >>> a person. >>> >>> The certification was done by a lab. You are welcome to download the >>> full report from the WIKI. >>> >>> http://www.elinux.org/Beagleboard:BeagleBoneBlack >>> >>> Gerald >>> >>> >>> On Mon, Dec 22, 2014 at 7:57 AM, <[email protected]> wrote: >>> >>>> Hi Guys, I am seeing the same issue as Richard above. Was a solution >>>> ever found for this ESD reset issue? >>>> >>>> In the past I have had some success on solving this issue on other >>>> micros by adding some capacitance on the micro's reset line to prevent the >>>> reset I/P bouncing when the ESD takes place, however looking at the BBB >>>> schematics, this is already included in the form of C24 being 1uF. >>>> >>>> Richard, did you find a solution to this? >>>> >>>> Gerald, I assume this family of processors must be used in many >>>> commercial products. Do you have an idea of what solutions were used to >>>> overcome this? >>>> >>>> Many thanks in advance. >>>> Lee. >>>> >>>> On Friday, 1 August 2014 18:57:39 UTC+1, Gerald wrote: >>>>> >>>>> CE testing that was does not cover ESD testing. This board has never >>>>> been tested for ESD. >>>>> >>>>> Gerald >>>>> >>>>> >>>>> >>>>> On Fri, Aug 1, 2014 at 12:21 PM, Richard Ketcham <[email protected]> >>>>> wrote: >>>>> >>>>>> Hello, >>>>>> >>>>>> I'm interested in CE testing a device which includes the BBB. In >>>>>> order to determine if the device will pass, I've been shocking it with >>>>>> an >>>>>> ESD gun (both contact and discharge). I have been running into an issue >>>>>> where when I shock the ground plane with a 4kV contact discharge, the >>>>>> BBB >>>>>> Ethernet becomes unresponsive and does not recover until I cycle the >>>>>> power. >>>>>> I've tried this test with only the BBB and it reacts the same way. I see >>>>>> there's a CE certification which says it passes 4kV contact discharge, >>>>>> but >>>>>> I've been unable to replicate it. >>>>>> >>>>>> >>>>>> Are there caveats to the CE certification which the BBB has relating >>>>>> to ESD testing? >>>>>> Is this a self certification? >>>>>> Do you have any suggestions on how mitigate this problem? >>>>>> >>>>>> I will appreciate any information you can provide on this problem. >>>>>> Thanks, >>>>>> Rich >>>>>> >>>>>> -- >>>>>> For more options, visit http://beagleboard.org/discuss >>>>>> --- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "BeagleBoard" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an email to [email protected]. >>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>> >>>>> >>>>> -- >>>> For more options, visit http://beagleboard.org/discuss >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "BeagleBoard" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> >>> >>> -- >>> Gerald >>> >>> [email protected] >>> http://beagleboard.org/ >>> http://circuitco.com/support/ >>> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > Gerald > > [email protected] <javascript:> > http://beagleboard.org/ > http://circuitco.com/support/ >
-- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
