[Chip]：LLCC68
[Working frequency]：850MHz～930MHz
[Transmit power]：22dBm
[Distance]：6km
[Size]：10*10*2.5mm
[Weight]：0.5g±0.02g
[Introduction]：E220-900MM22S is an ultra-small volume independently developed based on a new generation of LoRaTM RF chip LLCC68 produced by Semtech, and is suitable for 868MHz, 915MHz SMD LoRaTM wireless modules, using industrial grade 32MHz crystal oscillator.
| Pin No. | Item | Direction | Description |
| 1 | VCC | - | Power supply, range 1.8V~3.7V (recommended to add external ceramic filter capacitor) |
| 2 | GND | - | Ground wire, connected to the power reference ground |
| 3 | NRST | Input | NRST Input Chip reset trigger input pin, active low |
| 4 | NC | - | - |
| 5 | NC | - | - |
| 6 | ANT | - | RF interface, stamp hole |
| 7 | GND | - | Ground wire, connected to the power reference ground |
| 8 | NC | - | - |
| 9 | TXEN | Input | RF switch launch control pin, connected to external microcontroller IO |
| 10 | RXEN | Input | RF switch receiving control pin, connected to external microcontroller IO, active high |
| 11 | BUSY | Output | Used for status indication (see LLCC68 manual for details) |
| 12 | MISO | Output | SPI data output pin |
| 13 | MOSI | Input | SPI data input pin |
| 14 | NSS | Input | Module chip select pin for starting an SPI communication |
| 15 | SCK | Input | SPI clock input pin |
| 16 | GND | - | Ground wire, connected to the power reference ground |
| 17 | NC | - | - |
| 18 | DIO3 | Input/Output | Configurable general-purpose IO port (see LLCC68 manual for details) |
| 19 | DIO2 | Input/Output | Configurable general-purpose IO port (see LLCC68 manual for details) |
| 20 | DIO1 | Input/Output | Configurable general-purpose IO port (see LLCC68 manual for details) |