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Ebyte E49-400M20S Wireless data transmission module pure hardware module to develop and use
[Introduction]：E49-400M20S is a cost-effective wireless data transmission module launched by Chengdu Ebyte. It is a pure hardware module based on CMT2300A. E49-400M20S supports a maximum transmit power of 20dBm, and users can set a lower output power to save power consumption.
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| No. | Name | Direction | Function |
| 1 | GND | - | Ground wire, connect to power reference ground |
| 2 | GND | - | Ground wire, connect to power reference ground |
| 3 | GND | - | Ground wire, connect to power reference ground |
| 4 | GND | - | Ground wire, connect to power reference ground |
| 5 | GPIO1 | DIO | Configurable multi-function IO port (see 0^1723 00A manual for details) |
| 6 | GPIO2 | DIO | Configurable multi-function IO port (see CNIT2300A manual for details) |
| 7 | GPIO3 | DLO | Configurable multi-function IO port (see CNIT2300A manual for details) |
| 8 | VCC | - | Module power supply, connect to power supply -3.3V |
| 9 | GND | - | Ground wire, connect to power reference ground |
| 10 | GND | - | Ground wire, connect to power reference ground |
| 11 | SCLK | DI | SPI clock pin |
| 12 | SDIO | DLO | SPI data pins |
| 13 | CSB | DI | Chip select for SPI access register |
| 14 | FCSB | DI | Chip select for SPI access to FIFO |
| 15 | GND | - | Ground wire, connect to power reference ground |
| 16 | GND | - | Ground wire, connect to power reference ground |
| 17 | ANT | - | Module RF stamp hole interface, equivalent impedance is about 50Ω |
| 18 | GND | - | Ground wire, connect to power reference ground |