Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing

2015-01-07 Thread John Syn
: beagl...@googlegroups.com javascript: Date: Monday, January 5, 2015 at 1:41 AM To: beagl...@googlegroups.com javascript: beagl...@googlegroups.com javascript: Subject: Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing To give further background

Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing

2015-01-07 Thread Lee
, January 5, 2015 at 1:41 AM To: beagl...@googlegroups.com javascript: beagl...@googlegroups.com javascript: Subject: Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing To give further background... The BBB is positioned centrally at the front of a relatively

Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing

2015-01-06 Thread lee . shaw
To give further background... The BBB is positioned centrally at the front of a relatively large enclosure. It is connected to a display/touchscreen which are also situated in the same area. The USB I/O is brought out of the enclosure at the side of the unit via USB cables and another PCB.

Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing

2015-01-06 Thread John Syn
From: lee.s...@bibby-scientific.com Reply-To: beagleboard@googlegroups.com beagleboard@googlegroups.com Date: Monday, January 5, 2015 at 1:41 AM To: beagleboard@googlegroups.com beagleboard@googlegroups.com Subject: Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD

Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing

2014-12-30 Thread 'dl4mea' via BeagleBoard
If we are just at this theme, what about the ethernet lines? Looking at the schematic, sheet 9, the 4 active lines are directly connected to the LAN8710 chip. Or is there anything not visible inside the RJ45 connector? Regards, Günter -- For more options, visit http://beagleboard.org/discuss

Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing

2014-12-30 Thread evilwulfie
If you look up the part number of the rj45 jack you will find it has integrated magnetics which isolates the lan chip from DC currents. On 12/30/2014 12:48 AM, 'dl4mea' via BeagleBoard wrote: If we are just at this theme, what about the ethernet lines? Looking at the schematic, sheet 9, the

Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing

2014-12-29 Thread lee . shaw
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

Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing

2014-12-23 Thread lee . shaw
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

Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing

2014-12-23 Thread Gerald Coley
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, lee.s...@bibby-scientific.com wrote: Thanks for the

Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing

2014-12-23 Thread Chris Morgan
How is your esd protection designed at the usb connections, or are you hitting the usb connectors right on the bbb? Would need a lot more details about exactly how the system was being built and where you are discharging to know what might be going on. I'm guessing your esd protection may not be

Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing

2014-12-23 Thread John Syn
On 12/23/14, 4:58 PM, Chris Morgan chmor...@gmail.com wrote: How is your esd protection designed at the usb connections, or are you hitting the usb connectors right on the bbb? Would need a lot more details about exactly how the system was being built and where you are discharging to know what

Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing

2014-12-22 Thread lee . shaw
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,

Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing

2014-12-22 Thread Gerald Coley
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.

[beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing

2014-08-01 Thread Richard Ketcham
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

Re: [beagleboard] CE and ESD, BBB is failing 4kV contact discharge ESD testing

2014-08-01 Thread Gerald Coley
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 rich.ketc...@gmail.com wrote: Hello, I'm interested in CE testing a device which includes the BBB. In order to determine if the device will