[Chip solution]：SX1268
[Carrier frequency]：410.125~493.125MHz
[Transmission power]：33dBm
[Communication distance]：16km
[Introduction]：E22-400T33E is a new generation of LoRa wireless spread spectrum module designed based on the SX1268 chip solution. It has multiple transmission methods, works in the 410.125-493.125MHz frequency band (default 433.125MHz), LoRa spread spectrum technology, compatible with 3.3V and 5V IO ports Voltage, using MINI PCI-e standard package, with UART/RS485/RS232/USB communication interface options, and communication compatible with E22-T series products, which is convenient for users to develop and use. The module has a longer transmission distance and faster speed; it supports wake-up over the air, wireless configuration, carrier sense, automatic relay, communication key and other functions, supports packet length setting, and can provide customized development services.
| Pin No. | Item | Direction | Description |
| 1 | TO | output | Used to indicate the working status of the module; the user wakes up the external MCU , and outputs a low level during the initialization of the power-on self-test; (can be suspended) |
| 2 | VCC | enter | Power input 5.0V |
| 3 | M0 | Input ( very weak pull-up ) | Cooperate with M1 to determine the 4 working modes of the module (not floating, if not used, it can be grounded) |
| 4 | GND | power reference ground | |
| 5 | Ml | Input ( very weak pull-up ) | Cooperate with M0 to determine the 4 working modes of the module (not floating, if not used, it can be grounded) |
| 6 | NC | - | - |
| 7 | NC | - | - |
| 8 | NC | - | - |
| 9 | GND | - | power reference ground |
| 10 | SMD_DI0 | input /output | Program download data interface ( the module needs to be reset or erased before SWD programming ) |
| 11 | RXD | enter | TTL serial port input, connect external TXD output pin |
| 12 | swD_CLK | input /output | Program download clock interface ( the module needs to be reset or erased before SWD programming ) |
| 13 | TXD | output | TTL serial port output, connect external RXD input pin |
| 14 | NC | - | - |
| 15 | GND | - | power reference ground |
| 16 | NC | - | - |
| 17 | NC | - | - |
| 18 | GND | - | power reference ground |
| 19 | NC | - | |
| 20 | NC | - | power reference ground |
| 21 | GND | - | power reference ground |
| 22 | RESET | enter | Input a high level module to enter the hardware reset state, input a low level module to return to normal working state, this function is used for reset operation in emergency |
| 23 | NC | - | - |
| 24 | VCC | enter | Power input 5.0V |
| 25 | NC | - | - |
| 26 | GND | - | power reference ground |
| 27 | GND | - | power reference ground |
| 28 | NC | - | - |
| 29 | GND | - | power reference ground |
| 30 | NC | - | - |
| 31 | NC | - | - |
| 32 | NC | - | - |
| 33 | NC | - | - |
| 34 | GND | - | power reference ground |
| 35 | GND | - | power reference ground |
| 36 | USB_D- | input /output | D- of other external USB devices |
| 37 | GND | - | power reference ground |
| 38 | USB_D+ | input /output | D+ connected to other USB devices |
| 39 | VCC | enter | Power input 5.0V |
| 40 | GND | - | power reference ground |
| 41 | VCC | enter | Power input 5.0V |
| 42 | NC | - | - |
| 43 | GND | - | power reference ground |
| 44 | NC | - | - |
| 45 | RS232_RXD | enter | External TXD of other RS232 devices |
| 46 | NC | - | - |
| 47 | RS232_TXD | output | RXD connected to other RS232 devices |
| 48 | NC | - | - |
| 49 | RS485_A | input /output | A terminal connected to other RS485 devices |
| 50 | GND | - | power reference ground |
| 51 | RS485_B | input /output | Connect to the B terminal of other RS485 devices |
| 52 | VCC | enter | Power input 5.0V |