Smart Machine Smart Decision
SIM5320JE-TE_Hardware Design_V1.01
2012-07-10
29
3.3.1
Pin Description
Table
8
: Pin description
Pin type
Pin name
Pin No.
I/O
Active voltage
Default Status
UART_RXD
61
I
High/Low
Pull-Down
UART_TXD
58
O
High/Low
Pull-Up
UART_RTS
63
O
High/Low
UART_CTS
62
I
High/Low
Pull-Up
UART_DTR
57
I
High/Low
Pull-Up
UART_DCD
59
O
High/Low
UART
UART_RI
60
O
High/Low
More pin information refers to chapter 2.2.
Table
9
: Logic level
Parameter
Min
Max
Unit
Logic low input
-0.3
0.91
V
Logic high input
1.69
2.9
V
Logic low output
0
0.45
V
Logic high output
2.15
2.6
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.
Figure
21
: RI behaviour in NULL Modem
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