[Chip solution]：DA14531
[Operating frequency]： 2.402~2.480GHz
[Bluetooth protocol]：BLE5.0
[Communication distance]： 500m
[Product size]：16*10mm
[Introduction]：E104-BT52PX Bluetooth module is a Bluetooth to serial port module based on the BLE5.0 Bluetooth protocol version. It is a master-slave integrated module with small size and low power consumption, and works in the 2.4GHz frequency band. The Bluetooth module can be widely used in smart wearables, home automation, home security, personal health care, smart home appliances, accessories and remote controls, automobiles, lighting, industrial Internet, smart data collection, smart control and other fields.
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| Serial number | Pin Definition | Pin Direction | Pin Function | illustrate |
| 1 | GND | input | Power Ground | -- |
| 2 | VL- | -- | Low voltage power supply pin | Low voltage power supply pin, users do not need to care about |
| 3 | VCC | input | Power positive | Power supply positive (short connected to pin 4 "VH+" when in use) |
| 4 | VH+ | input | Power positive | Power supply positive (short connected to pin 3 "VCC" when in use) |
| 5 | GND | input | Power Ground | -- |
| 6 | GND | input | Power Ground | -- |
| 7 | RST | input | Reset pin | Low level reset (about 500ms to take effect) |
| 8 | PART¹ | input | SWEDING | SWDIO, JTAG interface, users do not need to care |
| 9 | NC | -- | NC | Users don't need to care |
| 10 | CLK | input | SWCLK | SWCLK, JTAG interface, users do not need to care about |
| 11 | NC | -- | NC | Users don't need to care |
| 12 | GND | input | Power Ground | Power Ground |
| 13 | WKP | input | Wake-up pin | Wake up: falling edge; Sleep: rising edge. |
| 14 | TXD | Output | Serial Port | Serial port output |
| 15 | RXD | input | Serial Port | Serial port input |
| 16 | LINK | Output | Connection Status | Bluetooth connection: High level Bluetooth no connection: low level |
| 17 | DATA | Output | data | Data indication pin Note: Receiving Bluetooth data: When there is Bluetooth data in the air, the DATA pin will be pulled high when it is sent through the TXD pin of E104-BT52/E104-BT52X, and then the pin will be pulled low again after a frame of data is sent. Sending Bluetooth data: The DATA pin buffers the BUFF size of 1025 bytes after receiving data at the RXD pin of E104-BT52/E104-BT52X. As long as there is data in the BUFF that has not been sent out via Bluetooth, DATA will be pulled high until the data in the BUFF is sent and then it will be pulled low again. When sending data, users can frame the data according to the above description. |
| 18 | GND | input | Power Ground | Power Ground |