[Chip solution]：TLSR8208BER
[Operating frequency:]：2.402~2.480GHz
[Communication distance]：120m
[Product size]：10*10mm
[Introduction]：EWM104-BT09SX is a Bluetooth to serial port slave module based on Bluetooth protocol version 5.0 developed by Ebyte based on Tailingwei's TLSR8208BER chip. It is small in size, low in power consumption, and operates in the 2.4GHz frequency band. The Bluetooth module uses common AT commands to set parameters, and the operation is simple and fast. The module supports slave roles, Bluetooth broadcasting, data transparent transmission, and air configuration. The 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, intelligent data acquisition, intelligent control and other fields. It supports data transmission at a maximum baud rate of 1000000bps.
Official Store
| Serial number | Pin definition | Pin function | Pin direction | Description |
| 1 | GND | GND | -- | Power Ground |
| 2 | PD6 | PD6 | -- | GPIOs are reserved, so users don't need to care |
| 3 | PD7 | RESTORE | Input | After pulling up internally, falling edge, and then keeping low for at least 5 seconds, all parameters are factory reset and the module is automatically restarted. |
| 4 | SWS | SWS | -- | The program download pin, the user does not need to care; |
| 5 | PA7 | LINK | Output | The connection status indicates the pin, with a high level indicating that it is connected and a low level indicating that it is disconnected |
| 6 | PB2 | BAT_DET | Input | Battery voltage detection, see section 6.2.16 for details |
| 7 | RESETB | RESET | Input | Reset pin, reset low |
| 8 | PB4 | WKP | Input | The default low-level, low-power mode, the serial port cannot communicate. Pull up to enter the normal working mode, and the serial port can communicate. |
| 9 | PB5 | RXD | Input | Serial input |
| 10 | PB6 | TXD | Output | Serial output |
| 11 | GND | GND | -- | Power Ground |
| 12 | VBAT | VBAT | -- | Power supply positive, 2.0V~4.2V, 3.3V power supply recommended |
| 13 | PB7 | PB7 | -- | GPIOs are reserved, so users don't need to care |
| 14 | PC0 | PC0 | -- | GPIOs are reserved, so users don't need to care |
| 15 | PC1 | PC1 | -- | GPIOs are reserved, so users don't need to care |
| 16 | PD2 | PD2 | -- | GPIOs are reserved, so users don't need to care |
| 17 | PD1 | PD1 | -- | GPIOs are reserved, so users don't need to care |
| 18 | GND | GND | -- | Power Ground |