SIM908 EVB kit User Guide
B2: GSM net status
B3: The GSM part of the module ON/OFF status
B5: DBG RXD/TXD STATUS
C1-C9: Key control for various functions
C1: GSM part power-up / power down control (button Z101)
C2: VBAT ON/OFF control (shifter S102)
C3: VCHG ON/OFF control (shifter S105)
C4: GSM part program download control (shifter S101)
C7: debug port RXD/TXD LED status selective shifter (shifter S106)
D: Power source adapter interface
E1-E3: Audio interface
E1: Handset interface
E2: Headphone interface
E3: Buzzer
F1-F2: Serial ports
F1: Main serial port for downloading, AT command transmitting, data exchanging
F2: Debug serial port default for GPS NMEA information output
G1-G2: Hole for antenna fixed
G1: Hole for GSM antenna fixed
G2: Hole for GPS antenna fixed
H: Expand port, such as serial ports, display port
L1-L4: Hole for EVB board fixed
K: SIM card connector
L: 3.3V Back-up battery for GSM part
SIM908_EVB kit_ User Guide _V1.00
2011.8.15
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