RK3288 Hardware Design Guide
5 POWER
5.1 Schematic
VDD_CPU and VDD_GPU are main power supply for CPU, the current peak will be up
to 4.4A/3.6A ([email protected], CPU@400MHz). Don't reduce the number of filter
capacitors in reference design (capacitor value of VDD_CPU is 145uF, capacitor value
of VDD_GPU is 66uF), and the large value capacitors should be placed on the reverse
side or near CPU to ensure power ripple within 100mV, in case that power ripple is too
large in condition of heavy load, as shown in Fig 5-1.
Fig 5-1
CPU_VDD_COM/GPU_VDD_COM(as shown in Fig 5-2) is the CPU/GPU feedback
connected to FB of DC/DC, which can decrease power loss due to PCB power trace
impedance and increase the power dynamic adjustment rate.
Fig 5-2
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...
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