[Product size]：25*40.5mm
[Communication distance]：16km
[Transmit power]：33dBm
[Carrier frequency]：410.125~493.125MHz
[Chip solution]：SX1268
[Introduction]：E22-400T33S is a wireless serial port module (UART) based on SEMTECH's SX1268, working at 410.125 ～ 493.125MHz (default 433.125MHz),TTL level output, compatible with 3.3V and 5V IO port voltage. Compared with the traditional SX1278 solution, it has a longer transmission distance, faster speed, lower power consumption, and smaller size; it supports functions such as air wake-up, wireless configuration, carrier monitoring, automatic relay. communication keys and sub-package length setting. Ebyte provides customized development services on it. An obvious advantage is that SX1268 covers wider frequency range.
| Pin No. | Pin Name | Pin Direction | Pin Function |
| 1 | GND | Input | Module ground |
| 2 | VCC | Input | Module power positive reference, voltage range:3.3~5.5V DC |
| 3 | AUX | Output | Used to indicate the working status of the module; |
| For user to wakes up the external MCU and it outputs low level during power-on self^check initialization; (can be left floating) | |||
| 4 | TXD | Output | TTL UART outputs, connects to external RXD input pin. |
| 5 | RXD | Input | TTL UART inputs, connects to external TXD output pin. |
| 6 | Ml | Input (weak pull-up) | Work with MO to decide 4 working modes of module (not float, if not used： could be grounded). |
| 7 | MO | Input (weak pull-up) | Work with Ml to decide 4 working modes of module (not float, if not used： could be grounded). |
| 11 | ANT | Output | Antenna interface (High frequency signal output, 50 ohm characteristic impedance ) |
| 12 | GND | - | Fixed ground |
| 13 | GND | - | Fixed ground |
| 14 | GND | - | Fixed ground |
| 18 | NC | - | NC |
| 19 | NC | - | NC |
| 20 | NC | - | NC |
| 21 | NC | - | NC |
| 22 | RESET | Input | RESET pin when the program is loaded (be left floating, the user does not need to connect) |
| 23 | GND | Input | Ground pin when loading program (be left floating, the user does not need to connect) |
| 24 | NC | - | NC |