YHM4001/2:   -Max 12.5Kbps data communication during charging in VMC mode and up to 1.2Mbpsdirect UART communication

                       -1.5A direct charging path

                       -Ear bud plug in/out detection

                       -10-bits ADC for current/voltage/impedance monitoring

                       -Watch dog time-out to turn off power path and reset SOC 

YHM2009: WLP-6 OVP，Uart communication

YHM4201: 2:1 Mux switch with level shift