Name: Adafruit Bluefruit LE SPI Friend - Bluetooth® Low Energy
Brand: Adafruit
SKU: 2633

Logical pinout · physical placement not verified

VINmain header
Power supply input, regulated down to 3.3V
Type · PowerVoltage · 3.3-16V input
GNDmain header
Common ground for power and logic
Type · GroundVoltage · 0V
SCKmain header
SPI serial clock input
Type · SPIVoltage · logic level
MISOmain header
SPI data from nRF51 to MCU
Type · SPIVoltage · logic level
MOSImain header
SPI data from MCU to nRF51
Type · SPIVoltage · logic level
CSmain header
SPI chip select
Type · SPIVoltage · logic level
IRQmain header
nRF51 interrupt to MCU when data available
Type · SignalVoltage · logic level
DFUmain header
Force firmware update/factory reset mode when low at power-up
Type · ControlVoltage · logic level
RSTmain header
Module reset, hold low then release/high
Type · ControlVoltage · logic level
CLKreverse side breakout
SWD clock
Type · UnknownVoltage · 3V logic
DIOreverse side breakout
SWD data
Type · UnknownVoltage · 3V logic
F.RSTreverse side breakout
Factory reset pad, tie to ground at power-up
Type · Control
3.3Vreverse side breakout
Regulated 3V output
Type · PowerVoltage · 3.3V output up to 250mA

Pin	Position	Type	Function	Voltage
VIN	main header	Power	Power supply input, regulated down to 3.3V	3.3-16V input
GND	main header	Ground	Common ground for power and logic	0V
SCK	main header	SPI	SPI serial clock input	logic level
MISO	main header	SPI	SPI data from nRF51 to MCU	logic level
MOSI	main header	SPI	SPI data from MCU to nRF51	logic level
CS	main header	SPI	SPI chip select	logic level
IRQ	main header	Signal	nRF51 interrupt to MCU when data available	logic level
DFU	main header	Control	Force firmware update/factory reset mode when low at power-up	logic level
RST	main header	Control	Module reset, hold low then release/high	logic level
CLK	reverse side breakout	Unknown	SWD clock	3V logic
DIO	reverse side breakout	Unknown	SWD data	3V logic
F.RST	reverse side breakout	Control	Factory reset pad, tie to ground at power-up
3.3V	reverse side breakout	Power	Regulated 3V output	3.3V output up to 250mA

Logical pinout · physical placement not verified

Pin details

13 connections

VIN
Power supply input, regulated down to 3.3V
PowerVoltage · 3.3-16V input
main header
GND
Common ground for power and logic
GroundVoltage · 0V
main header
SCK
SPI serial clock input
SPIVoltage · logic level
main header
MISO
SPI data from nRF51 to MCU
SPIVoltage · logic level
main header
MOSI
SPI data from MCU to nRF51
SPIVoltage · logic level
main header
CS
SPI chip select
SPIVoltage · logic level
main header
IRQ
nRF51 interrupt to MCU when data available
SignalVoltage · logic level
main header
DFU
Force firmware update/factory reset mode when low at power-up
ControlVoltage · logic level
main header
RST
Module reset, hold low then release/high
ControlVoltage · logic level
main header
CLK
SWD clock
UnknownVoltage · 3V logic
reverse side breakout
DIO
SWD data
UnknownVoltage · 3V logic
reverse side breakout
F.RST
Factory reset pad, tie to ground at power-up
Control
reverse side breakout
3.3V
Regulated 3V output
PowerVoltage · 3.3V output up to 250mA
reverse side breakout

Start wiring

UART · SPI · 3.3 V · 5 V · Breakout

Seeed describes MDBT50Q-1M and MDBT50Q-P1M as Bluetooth 5.0 / BLE modules based on Nordic nRF52840, with GPIO, SPI, UART, I2C, I2S, PWM, …

Module pins: VIN, GND, 3.3V, SCK, MISO, MOSI, CS, IRQ. Schematik maps them to your board in the app.

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Pinout