TERMINAL DESCRIPTIONSUniversal connectorIt is possible to use a resin-based cover for the Universalconnector.Pin No. Name I/O Description Specification1 SSW I Ext/ Int Speaker SwitchInput Hi: INT, Low: EXT2 SP+ O BTL Output + for ExternalSpeaker Standard load 8 K3 SP- O BTL Output – for ExternalSpeaker Standard load 8 K4 MSW I Ext/ Int MIC Switch Input Hi: INT, Low: EXT5 EMC I External MIC Input Impedance: 1.8 kK6 ME - External MIC GND -7 PTT I External PTT Input Low: PTT ON8 PF I Programmable FunctionKey Input Input voltage: 0 V - 3.3 V9 OPT I/O Aux I/O Port (for EXTOption)I: 0 V - 3.3 VO: Standard load 25 kK10 E - GND GND11 5V O 5 V 5 V power supply outputMax output current: 140 mA12 TXD O Serial Data Output Baud rate: 115200 bps max13 RXD I Serial Data Input Baud rate: 115200 bps max14 EMC I External MIC input Impedance: 1.8 kKAntenna Terminal50 K impedance12