Thread: Soldering advice needed for re-attaching N900 USB to mainboard.
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blue_led is offline blue_led
2011-09-26 , 17:04
Posts: 306 | Thanked: 566 times | Joined on Jan 2010 @ Romania
#95
Originally Posted by lazart View Post
I think I've made something wrong with the GND connection, because it came to my mind later, someone mentioned here, that GND is not USB-GND!
doesn't matter.
usb data lines are LVD* type so GND noise is rejected.
but BGND** != GND because between is placed a resistor for current sensing, used by BQ27200 chip

* LVD low voltage differential
** BGND battery ground
Last edited by blue_led; 2011-09-26 at 18:07.
 

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