[Chip solution]：SX1268
[Working frequency band]：410MHz～493MHz
[Transmission power]：22dBm
[Communication distance]：7km
[Product size]：10*10*2.5mm
[Introduction]：E22-400MM22S is an ultra-small size and suitable for 433MHz and 470MHz SMD LoRaTM wireless module based on the new generation of LoRaTM RF chip SX1268 produced by Semtech in the United States as its core.
| Pin number | Pin name | Pin direction | Pin purposes |
| 1 | VCC | - | Power supply, range 1.8V~3.7V (external ceramic filter capacitor is recommended) |
| 2 | GND | - | Ground wire, connected to the power reference ground |
| 3 | NRST | input | Chip reset triggers input pin, active low level |
| 4 | NC | - | - |
| 5 | NC | - | - |
| 6 | ANT | - | Radio frequency interface, stamp hole |
| 7 | GND | - | Ground wire, connected to the power reference ground |
| 8 | NC | - | - |
| 9 | TXEN | input | Rf switch transmitting control pin, connected to external |
| 10 | RXEN | input | Rf switch receiving control pin, connected to external |
| 11 | BUSY | output | Used for status indication |
| 12 | MIS0 | output | SPI data output pin |
| 13 | M0SI | input | SPI data input pin |
| 14 | NSS | input | The module chip selection pin is used to start an SPI |
| 15 | SCK | input | SPI clock input pin |
| 16 | GND | - | Ground wire, connected to the power reference ground |
| 17 | NC | - | - |
| 18 | DI03 | Input/output | Configurable universal I/O port |
| 19 | DIO2 | Input/output | Configurable universal I/O port |
| 20 | DI01 | Input/output | Configurable universal I/O port |