Capacitor Stuffing Option Recommended Values; Ground Layout With Usb - Intel Quark SoC X1000 Design Manual

Table 70.

Capacitor Stuffing Option Recommended Values

C3, C4
C1, C2, C5, C6
The placement of C1 through C6 may also differ for each board design (in other words,
not all of the capacitors may need to be populated). Also, the capacitors may not be
needed on both sides of the magnetics module.
Note: If using an integrated magnetics module without USB, provide a separate chassis
ground "island" to ground around the RJ-45 connector. The split in the ground plane
should be at least 20 mils wide.
Some integrated magnetics modules/RJ-45 connectors have recently incorporated the
USB into the device. For this type of magnetics module, a chassis ground moat may not
be feasible due to the digital ground required for the USB pins and their placement
relative to the magnetics pins. Thus, a continuous digital ground without any moats or
splits must be used.
Figure 101. Ground Layout with USB
®
Intel Quark™ SoC X1000
PDG
162
®
Intel Quark™ SoC X1000—LAN Design Considerations and Guidelines
Capacitors
Figure 101 provides an example of this.
Value
4.7 µF or 10 µF
470 pF to 0.1 µF
Order Number: 330258-002US
June 2014