USB-to-BLE bridge based on the nRF51822, presenting as a USB serial device to a computer and communicating with BLE 4.0 peripherals over UART. Allows a PC or Mac to interact with BLE-enabled phones and tablets.
Power supply input, regulated to 3.3V on the breakout
Common ground for power and logic
UART transmit out of Bluefruit LE to MCU
UART receive into Bluefruit LE from MCU
Clear-to-send input; pull low to allow data out on TXO
Ready-to-send output from module
Command/data mode select, high = command mode, low = UART/data mode
Force DFU mode on power-up or factory reset when held low after power-up
SWD clock for advanced debugging
SWD data for advanced debugging
Output from onboard 3V regulator
Factory reset pad, tie to ground while powering up for reset
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VIN | power header | power | Power supply input, regulated to 3.3V on the breakout | 3.3V to 16V input |
| GND | power header | ground | Common ground for power and logic | 0V |
| TXO | UART header | uart tx | UART transmit out of Bluefruit LE to MCU | 3.3V logic |
| RXI | UART header | uart rx | UART receive into Bluefruit LE from MCU | 3V to 5V logic accepted via level shifter |
| CTS | UART header | flow control input | Clear-to-send input; pull low to allow data out on TXO | 3V to 5V logic accepted via level shifter |
| RTS | UART header | flow control output | Ready-to-send output from module | 3.3V logic |
| MOD | control pads | mode select | Command/data mode select, high = command mode, low = UART/data mode | 3V to 5V logic accepted via level shifter |
| DFU | control pads | firmware reset | Force DFU mode on power-up or factory reset when held low after power-up | |
| SWC | test/advanced pads | debug clock | SWD clock for advanced debugging | 3.3V logic |
| SWD | test/advanced pads | debug data | SWD data for advanced debugging | 3.3V logic |
| 3Vo | power/test pad | power output | Output from onboard 3V regulator | regulated 3V, up to 250mA |
| FCR | control pad | factory reset | Factory reset pad, tie to ground while powering up for reset |
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. Schematik maps them to your board in the app.
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