Audio & BLE/SPP Pass-through Module

SKU: DFR0781

Audio & BLE/SPP Pass-through Module offers dual-mode Bluetooth for simultaneous audio playback and data transmission, simplifying embedded Bluetooth development with features like serial port control, BLE, and SPP pass-through.

Front of blue circuit board showing BLE module and pass-through functionality with microcontroller.-DFRobot product sku:DFR0781 image.
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  • Specification

    Parameter Details
    Power Supply 3.3V~5V
    Operating Current 20mA
    Communication UART
    Bluetooth 5.0
    Operating Temperature Range -20℃~80℃
    Operating Humidity Range 5%RH~95%RH
    Dimension 23*15.5mm/0.91*0.61”

    Dimension

    Pinout

    Pinout

    No. Define IO function Description
    1 PA3 AUX1L External Audio input channel--left channel
    2 PA4 AUX1R External Audio input Channel--right channel
    3 PA5 ADKEY ADkey, pull-up resistor of 22k, left floating when not in use
    4 USBDM USBD
    5 USBDP USBD+
    6 3V3 Power Output LDO output of the internal chip. The external load shall not exceed 80mA. Try not to use it.
    7 DVDD POWER Bias voltage of the chip DAC, connect a 105 resistor
    8 PA0 MIC MIC IO for calling
    9 DACR Right Channel Output
    10 DACL Left Channel Output
    11 SGND Analog Ground Connect to the ground of power supply separately, do not mix with digital ground, single point grounding is best
    12 GND Digital Ground
    13 VCC Power Input 3.3V -5V, suitable for 3.7 lithium battery power supply
    14 PC1 GPIO / PWM1
    15 PC3 SDDAT Connect to data pin of external TF card
    16 PC4 SDCMD Connect to command pin of external TF card
    17 PC5 SDCLK Connect to clock pin of external TF card
    18 PR2 GPIO/RESET Can work as normal IO or reset pin, floated at present
    19 PR1 LED Connect to external LED, high level to turn it on
    20 PB6 GPIO Common GPIO
    21 PB5 GPIO Common GPIO
    22 PB4 GPIO Common GPIO
    23 PB3 GPIO /MUTE Mute pin. Auto-detect when the module powered on, and output the corresponding level. Detecting method: pull up 10K, high level to mute; pull down 10K, low level to mute.
    24 PB2 GPIO Common GPIO
    25 PB1/RX UART-RX0 Connect to the TX of MCU, 3.3V level, please connect 1K resistor in series for 5V
    26 PB0/TX UART-TX0 Connect to the RX of MCU, 3.3V level, compatible with 5V level

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