RK3288 Hardware Design Guide
12.2 PCB Layout
Recommendations for Key PCB Layout:
ESD protective component should be placed close to Key to fulfill electrostatic
protection as shown in Fig 12-2;
Key-buffeting eliminated capacitor C1501 should be placed close to Chip;
Trace of ADKEY_IN should be separated with other signals by GND traces, which can
avoid misjudging key-value caused by crosstalk between signals.
Fig 12-2
To Next Page