TXD1DTR_N2RTS_N3VDD_IO4RXD5RI_N6NC7TXEN8DSR_N9DCD_N10CTS_N11SUSP_N12GPB313GPB214DP15DM16VO_3317GND18RESET_N19VIN20NC21GPB022GPB123GPB424GPB525NC26XI27XO28