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Smart Machine Smart Decision
3.3.1
Pin Description
Table 8: Pin description
Pin type
Pin name
Pin No.
I/O
Active voltage
Default Status
UART_RXD
64
I
H
Pull-Down
UART_TXD
6
O
H
Pull-Up
UART_RTS
63
O
H
UART_CTS
7
I
H
Pull-Up
UART_DTR
62
I
H
Pull-Up
UART_DCD
8
O
H
UART
UART_RI
61
O
H
More pin information refers to chapter 2.2.
Table 9: Logic level
Parameter
Min
Max
Unit
Logic low input
0
0.3*VDD_EXT
V
Logic high input
0.7 *VDD_EXT
V0.3
V
Logic low output
GND
0.2
V
Logic high output
VDD_EXT -0.2
VDD_EXT
V
Note: VDD
_
EXT (=2.6V) is e reference voltage in module internal interface.
All pins of all serial ports have 8mA driver capacity.
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.
SIM5215&SIM5216_Hardware Design_V2.02
2012-08-31
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