[IC]：SX1281
[Frequency]：2.4~2.5GHz
[Power]：27dBm
[Distance] ：7km
[Size]：40.5*25mm
[Weight]：4.8±0.1g
[Introduction]：E28-2G4T27SX is an UART module based on SEMTECH SX1281, it adopts transparent transmission and works at 2.4GHz band. It adopts LoRa, FLRC and GFSK modulations. It features SMD packing with both IPX and PCB antenna interfaces, compatible with 3.3V and 5V IO port voltage.
Limit Parameters
| Main Parameters | Performance | Note | |
| Min. | Max | ||
| Power supply（V） | 2.3 | 5.5 | Voltage over 5.5V will cause permanent damage to module |
| Blocking power [dBm] | - | 10 | Chances of burn is slim when modules are used inshort distance |
| Operating temperature [℃] | -40 | +85 | - |
Operating parameter
| Main Parameters | Performance | Note | ||
| Min. | Typ | Max | ||
| Voltage supply [V] | 2.3 | 5.0 | 5.5 | ≥5.0V ensures output power |
| Communication level [V] | - | 3.3 | - | For 5V TTL, it may be at risk of burning down |
| Operating temperature [℃] | -40 | - | +85 | - |
| Frequency [MHz] | 2400 | - | 2500 | ISM band |
| Transmitting current[mA] | - | 500 | - | Instant power consumption |
| Receiving current[mA] | - | 27 | - | - |
| Turn-off current[μA] | - | 10 | - | Software is shut down |
| Transmitting power [dBm] | 26.5 | 27 | 27.5 | - |
| Receiving sensitivity [dBm] | -130 | -132 | -134 | Air data rate: 115.2Kbps |
| Air data rate（bps） | 1k | 1k | 2M | Defined by user via programming |
| Main parameter | Description | Note |
| Distance | 5000m | Test condition：clear and open area, antenna gain: 5dBi，antennaheight: 2.5m，air data rate: 1kbps |
| FIFO | 121 Btye | Max. Transmitting length per packet |
| 221 Btye | Continuous transmission mode | |
| Cache | 2048 Byte | - |
| Modulation | GFSK | - |
| LoRa | - | |
| FLRC | - | |
| Interface | UART | TTL |
| Package | SMD | - |
| Connector | 1.27mm | - |
| Size | 40.5*25mm | - |
| Antenna | IPEX/Sample hole | 50Ω Impedance |
| Pin No. | Pin Name | Pin Direction | Function |
| 1 | GND | Ground | Ground |
| 2~7 | NC | - | cannot be floated, can be grounded if not used |
| 8 | GND | Ground | Ground |
| 9 | NC | - | cannot be floated, can be grounded if not used |
| 10 | GND | Ground | Ground |
| 11 | VCC | - | Module power source positive reference. Voltage range: 2.5V ~ 5.5V DC |
| 12 | AUX | Input | Used to indicate the module operation status, when user wakes up theexternal MCU,it outputs low level during initialization after power onand self-check, can be configured as open-drain output or push-pulloutput, please refer to Parameter Configuration.(can be floated) |
| 13 | TXD | Output | TTL serial input, connected to external TXD output pin. Can beconfigured as open-drain or pull-up input, please refer to ParameterConfiguration. |
| 14 | RXD | Output | TTL serial input, connected to external TXD output pin;It can be configured as drain open circuit or pull-up input. See parametersetting for details |
| 15 | M1 | Input | M2、M1、M0 共同组合决定模块 8 种工作模式 M2, M1 and M0 determine eight working modes |
| 16 | M0 | Input | M2, M1 and M0 determine eight working modes |
| 17 | M2 | Input | M2, M1 and M0 determine eight working modes |
| 18 | GND | Ground | Ground |
| 19 | ANT | - | Antenna interface (50 Ω characteristic impedance) |
| 20 | GND | Ground | Ground |
| 21 | GND | Ground | Ground |
| 22 | NC | - | cannot be floated, can be grounded if not used |
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| Technical support |
| 【Submit online】：http://www.ebyte.com/en/apple-technology.aspx |
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| Model | IC | Interface | Frequency Hz | Power dBm | Distance km | Air data rate | Package | Size (mm) | Feature | Manual | Sample |
|---|---|---|---|---|---|---|---|---|---|---|---|
| E28-2G4T27SX | UART | SX1281 | 2.4G | 27 | 7 | 1k ~ 2M | SMD | 40.5*25 | LoRa spread spectrum, high-speed continuous transmission | ||
| E28-2G4M27S | SPI | SX1280 | 2.4G | 27 | 8 | 0.125M~2M | SMD | 15 * 26.5 | LoRa spread spectrum,FLRC | ||
| E28-2G4T12S | UART | SX1280 | 2.4G | 12.5 | 3 | 1k ~ 2M | SMD | 17.5* 28.7 | LoRa spread spectrum | ||
| E28-2G4M20S | SPI | SX1280 | 2.4G | 20 | 6 | 0.125M~2M | SMD | 15 * 26.5 | LoRa spread spectrum,FLRC | ||
| E28-2G4M12S | SPI | SX1280 | 2.4G | 12.5 | 3 | 0.125M~2M | SMD | 14*25 | LoRa spread spectrum,FLRC |
