Guide

Platform Design Checklist
R
Intel
®
852GM Chipset Platform Design Guide 267
14.9. USB Power Checklist
14.9.1. Downstream Power Connection
Pin Name Notes
9
USB_VCC[E:A] One 220 µF and two 470 pF are recommended for every two power lines. Either a
thermister or a power distribution switch (with short circuit and thermal protection) is
required.
See Figure 148.
Figure 148. Good Downstream Power Connection
Port
Port
GGnndd
VVcccc
44
1
1
470pF
Thermiste
r
220uF
GGnndd
VVcccc
44
1
1
470pF
5V
5V
Switch5V Sus
Port
Port
GGnndd
VVcccc
44
1
1
470pF
Ferrite Bead
100-150uF
GGnndd
VVcc cc
44
1
1
470pF
PWR
Distribution
Switch
5V Sus
Ferrite Bead
100-150uF