1. Home
  2. Embedded Programming
  3. USB communication hung

USB communication hung

I am using ISP1582 USB device controller. I have connected TYPE-B connecor. I have used BLM21P220 inductor in between USB ground and board ground.

I have also placed another BLM21P220 at sheild and board ground.

Whenever I remove or plugin Laptop power supply while communication is going on inbetween laptop and board, USB communication is hanging.

Following things I observed

1) when I remove or plug in the power cord spike is generated. this spike can be seen on the osciloscope.

2) when I connect the USB analyzer it is saying SUSPEND.

3) If I removed both the BLM21P220 inductor then the USB communication hang problem resolved.

Could you please tell me why USB cmmunication is not hanging after ferrite bead BLM21P220 is removed?

I have used them for noise isolation from Board to Laptop. But when I used them on 1st spike the USB communication hangs.

How I can handle this problem? Is there any software way to resolve this issue?

Reply to
mahesh.himane
Loading thread data ...

In the simple word USB communication hangs along with BLM when spike come. When I remove BLM from ground connection spike does not affect. What was the reason?

spike

ferrite

used

Reply to
mahesh.himane

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.