Quectel BG77, Hardware Design, Page: 24 / 80

LPWA Module Series
BG77 Hardware Design
BG77_Hardware_Design 20 / 76
V
IH
max=2.0V
RXD 6 DI Receive data
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
If unused, keep this
pin open.
TXD 7 DO Transmit data
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep this
pin open.
CTS 39 DO Clear to send
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep this
pin open.
RTS 38 DI
Request to
send
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
If unused, keep this
pin open.
DCD 90 DO
Data carrier
detection V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep this
pin open.
RI 76 DO
Ring indication
signal V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep this
pin open.
Debug UART Interface
Pin Name
Pin
No.
I/O Description DC Characteristics Comment
DBG_RXD 61 DI Receive data
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
If unused, keep this
pin open.
DBG_TXD 60 DO Transmit data
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep this
pin open.
GNSS UART Interface
Pin Name
Pin
No.
I/O Description DC Characteristics Comment
GNSS_UART_TXD 36 DO Transmit data
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep this
pin open.
GNSS_UART_RXD 4 DI Receive data
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
If unused, keep this
pin open.