LPWA Module Series
BG77 Hardware Design
BG77_Hardware_Design 40 / 76
Table 12: Pin Definition of Main UART Interface
AT+IPR
command can be used to set the baud rate of the Main UART interface, and
AT+IFC
command
can be used to set the hardware flow control (hardware flow control is disabled by default). Please refer to
document [2]
for more details about these AT commands.
Table 13: Pin Definition of Debug UART Interface
Table 14: Pin Definition of GNSS UART Interface
The logic levels of UART interfaces are described in the following table.
Pin Name
Pin No.
I/O
Description
Comment
DTR 62 DI
Data terminal ready.
Sleep mode control.
1.8V power domain
RXD
6
DI
Receive data
1.8V power domain
TXD
7
DO
Transmit data
1.8V power domain
CTS
39
DO
Clear to send
1.8V power domain
RTS
38
DI
Request to send
1.8V power domain
DCD
90
DO
Data carrier detection
1.8V power domain
RI
76
DO
Ring indication signal
1.8V power domain
Pin Name
Pin No.
I/O
Description
Comment
DBG_TXD
60
DO
Transmit data
1.8V power domain
DBG_RXD
61
DI
Receive data
1.8V power domain
Pin Name
Pin No.
I/O
Description
Comment
GNSS_UART_TXD
36
DO
Transmit data
1.8V power domain
GNSS_UART_RXD
4
DI
Receive data
1.8V power domain
NOTE
