nRF52840 Dongle

Blecon Modem for Prototyping

The nRF52840 Dongle is a cheap and widely available USB dongle with an nRF52840 onboard.

nRF52840 Dongle

Pinout

The nRF52840 Dongle exposes the Blecon modem serialisation interface over USB and a physical UART port as below.

nRF52840 Dongle pinout

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).