AnsweredAssumed Answered

BF527's USB Transmission induce noise

Question asked by guorock Employee on Mar 24, 2010
Latest reply on Mar 25, 2010 by guorock

In my application, I am using BF527's USB to transmit data. Every 512ms, I transmit 13314 bytes by USB. I found when the USB is transmiting the data, the 3.3V power will degrade, as below figue shown, there is big glitch.

PRINT_00.JPG

If I stop the USB transmission, the 3.3V power will look like below:

PRINT_01.JPG

I doubt it maybe result from my 3.3V power chip's weak current drive capability. So I try to use external linear power(the current drive capability is big enough), but the result is the same.

So appreciated if you can give me some advices!!!

Outcomes