RK3288 Hardware Design Guide
shown in Fig 11-4; If the trace is on PCB surface layer, it should be surrounded by GND,
as shown in Fig 11-5;
Fig 11-4
Fig 11-5
Take as less vias between different layers as possible, which will cause
discontinuousness of impedance;
The current defined in USB 2.0 specifications is 500mA, but 1A is required for VBUS
trace to protect from over current. If USB interface is used for charging, VBUS trace
need to suffer 2.5A current.
Place ESD protective component, common mode choke and large capacitor as close as
possible to USB JACK, as shown in Fig 11-6, 11-7;
Fig 11-6
Summary of Contents for RK32 Series
Page 1: ...RK3288 Hardware Design Guide RK3288 Hardware Design Guide Revision 1 2 Jun 18 2014...
Page 2: ...RK3288 Hardware Design Guide Revision History Date Revision Description 2014 12 15 1 2...
Page 22: ...RK3288 Hardware Design Guide Fig 4 3 Fig 4 4...
Page 23: ...RK3288 Hardware Design Guide Fig 4 5...
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Page 62: ...RK3288 Hardware Design Guide Fig 11 7...
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