Adafruit Bluefruit LE SPI Friend - Bluetooth® Low Energy
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Bluetooth Low Energy module breakout with an SPI (AT-command) interface for adding BLE connectivity to microcontrollers without a free UART.
Bluetooth Low Energy module breakout with an SPI (AT-command) interface for adding BLE connectivity to microcontrollers without a free UART.
Power supply input, regulated down to 3.3V
Common ground for power and logic
SPI serial clock input
SPI data from nRF51 to MCU
SPI data from MCU to nRF51
SPI chip select
nRF51 interrupt to MCU when data available
Force firmware update/factory reset mode when low at power-up
Module reset, hold low then release/high
SWD clock
SWD data
Factory reset pad, tie to ground at power-up
Regulated 3V output
| 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 |
Power supply input, regulated down to 3.3V
Common ground for power and logic
SPI serial clock input
SPI data from nRF51 to MCU
SPI data from MCU to nRF51
SPI chip select
nRF51 interrupt to MCU when data available
Force firmware update/factory reset mode when low at power-up
Module reset, hold low then release/high
SWD clock
SWD data
Factory reset pad, tie to ground at power-up
Regulated 3V output
UART · SPI · 3.3 V · 5 V · Breakout
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