[Chip solution]：DA14531
[Working frequency]：2.402~2.480GHz
[Bluetooth protocol]：BLE5.0
[Communication distance]：130m
[Product size]：10*10mm
[Product net quantity]：0.4±0.1g
[Introduction]：E104-BT52X is a serial to BLE Bluetooth master-slave integrated module based on BLE 5.0. It is small in size and low in power consumption, working at 2.4GHz.E104-BT52 is developed by Chengdu Ebyte Electronic Technology Co., Ltd. based on the dialog DA14531 chip. The module uses general AT commands to set parameters, and the operation is simple and fast.
| Pin NO. | Item | Direction | Function | Remark |
| 1 | GND | Input | Ground | -- |
| 2 | VL- | -- | Low voltage power supply | Low voltage supply pins, no need to concern |
| 3 | VCC | Input | Power positive | Power positive (to be shorted to pin 4 "VH+" when used) |
| 4 | VH+ | Input | Power positive | Power positive (to be shorted to pin 3 “VCC” when used) |
| 5 | GND | Input | Ground | -- |
| 6 | GND | Input | Ground | -- |
| 7 | RST | Input | Reset pin | Reset in low level（take effective in 500ms） |
| 8 | DIO¹ | Input | SWDIO | SWDIO，JTAG interface, no need to concern |
| 9 | NC | -- | NC | no need to concern |
| 10 | CLK | Input | SWCLK | SWCLK，JTAG interface, no need to concern |
| 11 | NC | -- | NC | no need to concern |
| 12 | GND | Input | Ground | Ground |
| 13 | WKP | Input | Wake up pin | Wake up：falling edge；Sleep：rising edge |
| 14 | TXD | Output | UART | UART output |
| 15 | RXD | Input | UART | UART Input |
| 16 | LINK | Output | Link status | Bluetooth linked：high level |
| 17 | DATA | Output | Data | Data indication pin |
| 18 | GND | Input | Ground | Ground |