5G HUB BG77 Manuel technique et d'utilisation - Page 12
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2.8 PIN Description
PIN
DIRECTION
USB Connector
LED1 (USER)
LED2 (USER)
LED3 (USER)
LED (NET)
LED (STAT)
MCU RESET
button
BG77 RESET
button
User Button
USB Switch
IOREF
3.3V
5V
GND
A0
A1
A2
A3
A4
A5
SCL
SDA
AREFA
SCK
MISO
MOSI
SS
PA7
PA6
USB Dongle Rev 1.0
I
The USB dongle is powered from the USB port (3.8V-5V)
LED which can be controlled from MCU (D25). When the pin is
O
HIGH value, the LED is on, when the pin is LOW, it is off
LED which can be controlled from MCU (D26). When the pin is
O
HIGH value, the LED is on, when the pin is LOW, it is off
O
LED on powering on the USB
O
Indicate the BG77 operation status
O
Indicate the BG77 network activity status
I
Reset the MCU
I
Reset the BG77 module
Connected to digital pin, D0, of MCU and can be used for user-
I
defined purposes
I
1 switch to connect to MCU directly or BG77 directly
Provides the voltage reference with which the MCU operates. A
device can read the IOREF pin voltage and select the appropriate
O
power source or enable voltage translators on the outputs for
working with the 5V or 3.3V
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
Six analog inputs which can provide up to 12 bits of resolution
(i.e. 4096 different values). By default, each input measures
IO
from ground to 3.3 volts, though is it possible to change the
IO
upper end of their range using the AREF pin
IO
A0 can also be used as a DAC output and provides a 10 bit
IO
voltage output with
IO
Analog pins can be used as GPIOs
IO
I
2
C. The SCL (clock line). Can be used as GPIO
IO
I
2
C. The SDA (data line). Can be used as GPIO
Input reference voltage for the analog inputs used for either he
I
ADC or the DAC
IO
SPI Interface. Can be used as GPIO
IO
SPI Interface. Can be used as GPIO
IO
SPI Interface. Can be used as GPIO
IO
SPI Interface. Can be used as GPIO
IO
GPIO. Can be used as GPIO
IO
GPIO. Can be used as GPIO
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Description
analogWrite()
function
12