Refered from https://github.com/lucsmall/Arduino-RDA5807M
________
SDA | ___ | ANT
SCK | | | | NC
NC | |___| | R Out
NC | === | L Out
VCC |________| GND
P0 - SDA
P1 - Inbuild LED
P2 - SCL
P3 - CH switch
P4 - V + switch
P5 - V - switch