[Frequency]：850.125~930.125MHz
[Power]：22dBm
[Distance]：5km
[Size]：21*36mm
[Weight]：6.5±0.2g
[Introduction]：E22-900T22D is a wireless module (UART) with multiple transmission modes based on SEMTECH's LoRa solution, operating at 850.125MHz~930.125MHz (default 868.125MHz). Using LoRa spread spectrum technology, TTL level output, compatible with 3.3V and 5V IO port voltage.
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| No. | Name | Direction | Function |
| 1 | M0 | Input（weak pull-up） | Work with M1 to decide 4 working modes of module (not suspended, if notused, could be grounded). |
| 2 | M1 | Input（weak pull-up） | Work with M0 to decide 4 working modes of module (not suspended, if notused, could be grounded). |
| 3 | RXD | Input | TTL UART inputs, connects to external (MCU, PC) TXD output pin. Can beconfigured as open-drain or pull-up input. |
| 4 | TXD | Output | TTL UART outputs, connects to external RXD (MCU, PC) input pin. Can be configured as open-drain or push-pull output |
| 5 | AUX | Output | To indicate module ’s working status & wakes up the external MCU. During theprocedure of self-check initialization, the pin outputs low level. Can beconfigured as push-pull output (suspending is allowed). |
| 6 | VCC | Input | Power supply ：2.3~ 5.5V DC |
| 7 | GND | Input | Ground |
| 8 | Fixed hole | - | Connect to GND |
| 9 | Fixed hole | - | Connect to GND |
| 10 | Fixed hole | - | Connect to GND |