nRF52840 Dongle
Blecon Modem for Prototyping
The nRF52840 Dongle is a cheap and widely available USB dongle with an nRF52840 onboard.
Pinout
The nRF52840 Dongle exposes the Blecon modem serialisation interface over USB and a physical UART port as below.
Pin Label
Name
Function
GND
GND
Ground
VBUS
VBUS
USB Power supply
VDD OUT
VDD
nRF Embedded Regulator Output
1.13
RX
UART RX
1.10
TX
UART TX
0.02
CTS
UART Clear to Send
1.15
RTS
UART Ready to Send
0.09
NFC1
NFC antenna connection
0.10
NFC2
NFC antenna connection
Please note that the Blecon Modem firmware configures the onboard regulator to output 3.0V, and pins to operate at the 3.0V level. However some other firmware might configure those differently (1.8V).
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