Smart Machine Smart Decision
SIM800_Hardware Design_V1.10 17 2018-08-13
BT_ANT 53 I/O Bluetooth antenna port
Impendence must be
controlled to 50Ω.
RF_SYNC 67 O RF burst synchronous signal Do not pull up
RESET 16 I Reset input(Active low)
KPLED 23 I Drive keypad backlight
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