[Chip solution]：SX1281
[Operating frequency]： 2.4GHz
[Communication interface]：SPI
[Communication distance]：6km
[Introduction]：E28-2G4M20XX is a 2.4GHz RF transceiver module designed and produced by Ebyte, with a transmission power of 100mW and a long communication distance; it has extremely low current consumption in low-power mode. This LoRa module is a small-volume SMD type (pin spacing 1.27mm), with a high-performance PCB onboard antenna, and uses a 52MHz industrial-grade high-precision low-temperature drift active crystal oscillator; to ensure its industrial characteristics and its stable performance. It can be used for smart homes, security systems, positioning tracking, wearable devices, smart bracelets and health management, etc. It supports RSSI and can achieve in-depth secondary development as needed.
| Main parameters | Performance | Remark | |
| Minimum value | Maximum value | ||
| Supply voltage (V) | 0 | 3.6 | Exceeding 3.6V will permanently burn the module |
| Blocking power (dBm) | - | 10 | Less likely to be burned if used at close range |
| Working temperature (℃) | -40 | 85 | Industrial grade |
| Main parameters | Minimum value | Typical value | Maximum value | Remark | |
| Working voltage (V) | 1.8 | 3.3 | 3.6 | ≥3.3V guarantees output power | |
| Communication level (V) | - | 3.3 | - | Using 5V TTL risks burning out | |
| Working temperature (℃) | -40 | - | 85 | Industrial grade design | |
| Working frequency band (MHz) | 2400 | 2430 | 2500 | Support ISM frequency band | |
| Power consumption | Emission current (mA) | - | 140 | - | Instantaneous power consumption |
| Receive current (mA) | - | 10 | - | - | |
| Sleep current (μA) | - | 2 | - | Software shutdown | |
| Maximum transmit power (dBm) | 19 | 20 | twenty one | See section 4.2 for details | |
| Receiving sensitivity (dBm) | -130 | -131 | -132 | LoRa receiver sensitivity with CR=4/5 and high sensitivity mode enabled 1 SF12,BW=203kHz | |
| Communication speed rate | LoRa（bps） | 0.595k | - | 253.9k | User programmable customization |
| FLRC（bps） | 260k | - | 1.3M | User programmable customization | |
| GFSK（bps） | 125k | - | 2M | User programmable customization | |
| Main parameters | Parameter | Remark |
| reference distance | 6000m | Sunny and open space, antenna gain 5dBi, antenna height 2.5 meters, air rate 1kbps |
| FIFO | 256Byte | Maximum length of a single send |
| Crystal frequency | 52MHz | ±10ppm/11pF |
| Modulation method | LoRa(recommended) | GFSK，FLRC，LoRa |
| Packaging method | SMD type | - |
| Interface mode | 1.27mm | - |
| Communication interface | SPI | 0～10Mbps |
| Overall dimensions | 20*15mm | - |
| Antenna interface | IPEX | - |
