Specifications

SIM7912&SIM7906 Hardware Design V1.02
www.simcom.com 20 / 85
Pin name
Pin
No.
Electrical description
Description
Comment
CTS
56
DO
P3
Clear to send
1.8V power domain.
If unused, keep it open.
Default use for AT
command
RTS
57
DI
P3
Request to send
RXD
58
DI
P3
Receive data
DCD
59
DO
P3
Data Carrier detect
TXD
60
DO
P3
Transmit data
RI
61
DO
P3
Ring indicator
DTR
62
DI
P3
Data terminal ready,
sleep mode control:
Pulled up by default.
Pulling down to low level
will wake up the module.
BT interface*
Pin name
Pin
No.
Electrical description
Description
Comment
BT_EN
3
DO
P3
BT function enable
control
1.8V power domain.
If unused, keep it open.
BT _TXD
163
DO
P3
Transmit data
1.8V power domain.
If unused, keep it open.
BT UART interface pin by
default.
Can be multiplexed into
SPI_MOSI.
BT _CTS
164
DO
P3
Clear to send
1.8V power domain.
If unused, keep it open.
BT UART interface pin by
default.
Can be multiplexed into
SPI_CLK.
BT_RXD
165
DI
P3
Receive data
1.8V power domain.
If unused, keep it open.
BT UART interface pin by
default.
Can be multiplexed into
SPI_MISO.
BT _RTS
166
DI
P3
Request to send
1.8V power domain.
If unused, keep it open.
BT UART interface pin by
default.
Can be multiplexed into
SPI_CS.
Debug UART interface
Pin name
Pin
No.
Electrical description
Description
Comment