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ページを印刷する2.7 PIN Description
PIN
DIRECTION
USB Connector
LED (Power)
LED (NET)
LED (STAT)
3.3V
5V
GND
SCL
SDA
Cortex Debug
Connector
ADC0
ADC1
GPIO0
GPIO1
SPI
USIM
3 LTE and GNSS modem
Before powering on the USB dongle, make sure to insert SIM card into the SIM card slot and connect GNSS
and LTE antennas to the antenna UFL connectors on the USB dongle.
Plug the USB dongle into a USB port on a PC. When the USB is plugged into the USB port, the power LED
turns on. There are other two LEDs (STATE and NET) on the USB dongle for the modem status as listed in
the table:
LED
PWR
ON
STATE
ON
NET
Flicker slowly (200ms High/1800ms Low)
Flicker slowly (1800ms High/200ms Low)
Flicker slowly (125ms High/125ms Low)
When the USB dongle is powered-on, it will enumerate BG77 modem interfaces in "Device manager" on
Windows OS as shown in Figure 7.
USB Dongle Rev 1.0
Table 2: PIN description
I
The USB dongle is powered from the USB port (3.8V-5V)
O
LED on powering on the USB
O
Indicate the BG77 operation status
O
Indicate the BG77 network activity status
3.3V generated by the on-board regulator. Maximum current
O
drawn is 3A. The regulator also provides power to the MCU and
BG77
5V generated from the board. The board is supplied with power
O
from USB connector (typical 5V)
Ground
IO
I
2
C. The SCL (clock line). Can be used as GPIO
IO
I
C. The SDA (data line). Can be used as GPIO
2
Using Single Wire Debug to burn bootloader and debug the
IO
board
I
Connected to BG77. General purpose analogue to digital converter
I
Connected to BG77. General purpose analogue to digital converter
IO
Connected to BG77. General purpose IO
IO
Connected to BG77. General purpose IO
IO
Connected to BG77.
I
Used to insert a Nano USIM. Connected to BG77
Table 3: Modem LEDs
Behavior
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Description
Description
Indicates the USB dongle is powered on
Indicates the BG77 is powered on
Network Searching
Idle
Data transfer is ongoing
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