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3.3. UART ( RS-232 Interface )
This module is provided with interface supporting Standard RS-232 protocol.
DCE(modem) is exchanged with data or control AT-Command through DTE(host).
Pin
Signal Name
NO.
37
TXD2
39
RXD2
3.4. USB
It is supported with universal serial bus for high data communication.
It is satisfied with USB2.0 specification and supported with Max.480Mbps
Pin
Signal Name
NO.
29
USB_VBUS
35
USB_D+
36
USB_D-
3.5. AUDIO
Modem is provided with condenser mic input, speaker output for voice call
Speaker output can connect with 32Ω speaker
Pin
Signal Name
NO.
23
MIC+
24
MIC-
25
SPK+
26
SPK-
Function
Pin Function Summary
(Modem)
I
O
Function
Pin Function Summary
(Modem)
I
Power supply for the USB transceiver
I/O
USB differential data (+)
I/O
USB differential data (-)
Function
Pin Function Summary
(Modem)
I
Differential Microphone input (+)
I
Differential Microphone input (-)
O
Analog Audio Differential Output(+)
O
Analog Audio Differential Output (-)
Serial Data Input 2
Serial Data output 2
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