User's Manual

Smart Machine Smart Decision
SIM5360A_User_Manual_V1.03 2014-07-03
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3.3.1 Pin Description
Table 8: Pin description
Pin type Pin name Pin No. I/O Default Status
UART1
RXD 68 I Pull-Down
TXD 71 O Pull-Up
RTS 66 O
CTS 67 I Pull-Up
DTR 72 I Pull-Up
DCD 70 O
RI 69 O
UART2
UART2_RXD 7 I Pull-Down
UART2_TXD 8 O Pull-Up
More pin information refers to chapter 2.2.
Table 9: Logic level
Symbol Parameter
Min Typ Max Unit
V
IH
High-level input voltage
1.26 1.8 2.1 V
V
IL
Low-level input voltage
-0.3 0 0.63 V
V
OH
High-level output voltage
1.35 1.8 1.8 V
V
OL
Low-level output voltage
0 0 0.45 V
3.3.2 Application Guide
If UART port is used in Null Modem, the pin “RI” can be used as an interrupt signal to HOST. Normally it
will keep high logic level until certain condition such as receiving SMS, voice call (CSD, video) or URC
reporting, then “RI” will change to low logic level to inform the master (client PC). It will stay low until
the master clears the interrupt event with AT command.