LPWA Module Series
BG770A-GL Hardware Design
BG770A-GL_Hardware_Design 23 / 75
USB_DP
11
DIO
USB differential
data (+)
Compliant with USB
2.0 standard
specification. Require
differential impedance
of 90 Ω.
USB_DM
10
DIO
USB differential
data (-)
USBPHY_3P3
42
PI
Power supply for
USB PHY circuit
Vnom = 3.3 V
USBPHY_3P3
_EN
64
DO/PU
External LDO
enable control for
USB
1.8 V
(U)SIM Interface
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
USIM_DET*
44
DI/PD
(U)SIM card
hot-plug detect
1.8 V
If this pin is unused,
keep it open.
USIM_VDD
16
PO
(U)SIM card power
supply
Vmax = 1.9 V
Vmin = 1.7 V
Only 1.8 V (U)SIM
card is supported.
USIM_RST
15
DO/PD
(U)SIM card reset
1.8 V
USIM_DATA
14
DIO/PU
(U)SIM card data
1.8 V
USIM_CLK
13
DO/PD
(U)SIM card clock
1.8 V
USIM_GND
65
Specified ground
for (U)SIM card
Main UART Interface
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
MAIN_DTR
62
DI/PU
Main UART data
terminal ready
1.8 V
If this pin is unused,
keep it open.
MAIN_RXD
6
DI/PU
Main UART
receive
1.8 V
MAIN_TXD
7
DO/PU
Main UART
transmit
1.8 V
MAIN_CTS
39
DO/PU
Main UART clear
to send
1.8 V
MAIN_RTS
38
DI/PU
Main UART
request to send
1.8 V
MAIN_DCD
90
DO/PU
Main UART data
carrier detect
1.8 V
MAIN_RI*
76
DO/PU
Main UART ring
indication
1.8 V
