SAFEBOOT_N1D_SEL2TIMEPULSE3EXTINT4USB_DM5USB_DP6VDD_USB7RESET_N8VCC_RF9GND10RF_IN11GND12GND13LNA_EN/Reserved14Reserved15Reserved16Reserved17SDA/SPICS_N18SCL/SPICLK19TXD/SPIMISO20RXD/SPIMOSI21V_BCKP22VCC23GND24