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3. Interface
3.2 Pin description
Pin NO.
Signal Name
In/Out
Function
NC
1, 2, 3, 4, 5, 6, 9,
10, 13, 14, 15, 17
, 23, 24, 25, 26, 3
8
NC
V_BATT
31, 32
POWER
POWER
GND
21, 22, 33, 34, 40
GND
GND
Audio
PCM
16
PCM_3.3V_TXD
O
PCM DATA OUT
18
PCM_3.3V_RXD
I
PCM DATA IN
19
PCM_3.3V_CLK
I
PCM CLK
20
PCM_3.3V_SYNC
I
PCM SYNC
UART2
(DM Port)
37
UART_RXD
I
UART RX DATA
39
UART_TXD
O
UART TX DATA
7
UART_RFR
O
UART ready-for-receive
8
UART_CTS
I
UART clear-to-send
USB
(USB2.0)
29
USB_VBUS
I
Power supply for the
USB transceiver
35
USB_D+
I/O
USB differential data (+)
36
USB_D-
I/O
USB differential data (-)
User Interface
11
BOOT_OK
O
Modem Booting Completion
/ Modem Wake Up
12
MSG
O
Received emergency
message from Center
27
96H_END
O
Signified in 96 hours
standby mode ending
28
RESET_IN
I
Modem Hardware reset
input
30
ACC_ON_SLEEP
I
Modem Power ON
/ Modem POWER Sleep
Table 1. Pin descriptions