L3 R4：silabs 8051 MCU (EFM8BB3)
EFM8BB3 内置12位ADC可以监控USB TYEP-C接口的CC线，精确测量CC线上的压差，实现USB连接、拔除、传输方向的检测判断。ADC检测电流传感器、电压传感器实现过压保护，过流保护。EFM8BB3内置的逻辑单元（CLU）、模拟比较器、DAC方便和不同电源管理模块组合，实现电压的控制，监控，产品更加稳定可靠。
EFM8BB3 具有可现场升级的接口I2C，支持多种低功耗模式，极小封装满足空间要求苛刻的运用。Silicon labs公司可提供USB PD方案的参考原理图和运用代码，快速完成USB PD设计。
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