EWM104-BT61SX Bluetooth Audio Data Transmission/Broadcast Module Supports LE Audio and Classic Bluetooth
[Reference]：UART
[Operating Frequency]： 2.4GHz
[Bluetooth Protocol]： BLUE5.4
[Communication Distance]：160m
[Dimensions]：14*16.8mm
[Product Weight]：1.0±0.1g
[Introduction]：The EWM104-BT61SX module is a dual-mode Bluetooth audio transceiver module based on Bluetooth 5.4 and an IPEX-1 antenna interface. It supports LE Audio and classic Bluetooth, Bluetooth stereo, and has a maximum transmit power of 8dBm. The module supports AT command configuration parameters, one-to-many broadcasting, USB sound card input, Bluetooth wireless input, and dual-channel analog signal input. It also supports dual-channel analog signal output and Bluetooth wireless broadcast output, offering simple and quick operation.
Official Store
| Pin number | Pin Definitions | Pin direction | Pin Function | illustrate |
| 1 | WKP | input | Sleep pin | The sleep/wake pin is left floating by default. Holding it at a low voltage for more than 3 seconds will switch between sleep and wake-up states. |
| 2 | D1 | input | Address bit D1 | Default pull-up |
| 3 | D2 | input | Address D2 | Default pull-up |
| 4 | GND | - | power ground | |
| 5 | D3 | input | Address D3 | Default pull-up |
| 6 | D4 | input | Address bit D4 | Default pull-up |
| 7 | D5 | input | Address D5 | Default pull-up |
| 8 | D6 | input | Address bit D6 | Default pull-up |
| 9 | USB_DM | Input/Output | USB_D- | USB differential data negative polarity |
| 10 | USB_DP | Input/Output | USB_D+ | USB differential data positive polarity |
| 11 | SW | input | Connection confirmed | Used to confirm pairing; can be connected to a button; defaults to pull-up; effective on falling edge. |
| 12 | GND | - | power ground | |
| 13 | TX/RX | input | Transmit/Receive Mode Settings | This port operates in receive mode when left floating, and in transmit mode when connected to GND. |
| 14 | LINK | Output | Connection status output indication | TX: A periodic double flashing pattern with a 5-second cycle of 300ms on, 100ms off, and 300ms on again. RX: Before receiving, it flashes periodically for 0.5 seconds on and 0.5 seconds off, with a period of 1 second. After receiving the broadcast, the flashing pattern is the same as TX. |
| 15 | UART_RXD | input | Serial port RXD | TTL input, connected to the external TXD output pin |
| 16 | UART_TXD | Output | Serial port TXD | TTL output, connected to external RXD input pin |
| 17 | MUTE | Output | Power amplifier enable pin | - |
| 18 | AGND | - | Simulated land | audio signal ground |
| 19 | OUT_R | Output | Right channel audio output | The output has a DC component, so an external DC blocking capacitor is required. |
| 20 | OUT_L | Output | Left channel audio output | The output has a DC component, so an external DC blocking capacitor is required. |
| 21 | LINE_IN | input | Audio input detection | Pull-up by default, active low. |
| 22 | IN_R | input | Audio right channel input | |
| 23 | IN_L | input | Audio left channel input | |
| 24 | GND | - | power ground | |
| 25 | KEY1 | input | Play/Pause | Active low, momentary low level plays/pauses |
| 26 | KEY2 | input | Volume down/Previous track | Active low level; falling edge switches to the previous track; volume decreases if low level is maintained for more than 1 second. |
| 27 | KEY3 | input | Volume up/Next track | Active low level, falling edge switches to the next track, volume increases if low level is maintained for more than 1 second. |
| 28 | VPWR | input | charging pin | Operating voltage: 4.5V~5.5V |
| 29 | VBAT | input | Battery power supply pin | Operating voltage 3.0V~4.4V, this pin can be connected to a battery for power supply. |
| 30 | IOVDD | Output | IO voltage 3.4V | Used for powering peripherals, maximum current 120mA |
| 31 | GND | - | power ground | |
| 32 | GND | - | power ground |