Chengdu Ebyte Electronic Technology Co., Ltd. E10-433MD-SMA User ManualCopyright ©2012–2018,Chengdu Ebyte Electronic Technology Co.,Ltd. 43 Size and pin definitionNo. Name Direction Function1 GND - Ground2 SDN - Shutdown Input Pin. It is low level when working(See SI4463 manual for more details)3 GPIO3 output GPIO(see more from SI4463 datasheet)•4 GPIO2 output GPIO(see more from SI4463 datasheet)•5 nSEL input SPI Chip select for starting SPI communication6 M OSI input SPI master output slave input7 M ISO output SPI master input slave output8 SCK input Serial Clock Input9 IRQ output SPI interrupt request10 GPIO1 output GPIO(see more from SI4463 datasheet)•11 GPIO0 output GPIO(see more from SI4463 datasheet)•12 VCC - Power supply :1.8~ 3.6 V DC, 3.3V is recommended