N27 Hardware User Guide
Chapter 3 Module Pins
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18
if it is not used.
UART1 Interface
UART2_RTS
1
23
DO
Request
to
send
P3
Software (open) version: used
as UART2_RTS and used for
data transmission and AT
commands. Leave this pin
floating if it is not used.
UART2_CTS
1
24
DI
Clear to send P3
Software (open) version: used
as UART2_CTS and used for
data transmission and AT
commands. Leave this pin
floating if it is not used.
UART1_RXD/UA
RT2_RXD
1
25
DI
Data RX
P3
Software (standard) version:
used as UART1_RXD and
used for data transmission.
Leave this pin floating if it is not
used.
Software (open) version: used
as UART2_RXD and used for
data transmission and AT
commands. Leave this pin
floating if it is not used.
UART1_TXD/UA
RT2_TXD
1
26
DO
Data TX
P3
Software (standard) version:
used as UART1_TXD and
used for data transmission.
Leave this pin floating if it is not
used.
Software (open) version: used
as UART2_TXD and used for
data transmission and AT
commands. Leave this pin
floating if it is not used.
UART2 Interface
UART2_TXD
2
13
DO
Data TX
P3
Software (open) version: The
pins cannot be used. Leave the
pins floating.
UART2_RXD
14
DI
Data RX
P3
SIM Interface
USIM_VCC
6
PO
SIM
card
power supply
output
Support
1.8V
only,
I
Omax
=30mA
USIM_DATA
7
B
SIM
card
data IO
P3
Connect it to USIM_VCC
through a 10 kΩ pull-up
