LPWA Module Series
BG770A-GL Hardware Design
BG770A-GL_Hardware_Design 24 / 75
Debug UART Interface
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
DBG_RXD
61
DI/PU
Debug UART
receive
1.8 V
If this pin is unused,
keep it open.
DBG_TXD
60
DO/PU
Debug UART
transmit
1.8 V
DBG_CTS
51
DO/PU
Debug UART clear
to send
1.8 V
DBG_RTS
92
DI/PD
Debug UART
request to send
1.8 V
Auxiliary UART Interface
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
AUX_TXD
93
DO/PU
Auxiliary UART
transmit
1.8 V
If this pin is unused,
keep it open.
AUX_RXD
82
DI/PU
Auxiliary UART
receive
1.8 V
AUX_CTS
70
DO/PU
Auxiliary UART
clear to send
1.8 V
AUX_RTS
59
DI/PU
Auxiliary UART
request to send
1.8 V
PCM Interface*
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
PCM_CLK
3
DO/PD
PCM clock
1.8 V
If this pin is unused,
keep it open.
PCM_SYNC
35
DO/PU
PCM data frame
sync
1.8 V
PCM_DIN
2
DI/PU
PCM data input
1.8 V
PCM_DOUT
34
DO/PU
PCM data output
1.8 V
I2C Interface*
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
I2C_SCL
37
OD
I2C serial clock
(for external
codec)
External pull-up
resistor is required.
1.8 V only.
If this pin is unused,
keep it open.
