EBYTE E49-900M20S is a cost-effective wireless data transmission module launched by Chengdu Ebyte. It is A pure hardware module based on CMT2300A.E49-900M20S Supports the maximum transmission power of 20dBm, users can set a lower output power， thus saving power consumption. The module works in the 850MHz ~ 930MHz frequency band, including the commonly used 868MHz and 915MHz frequency bands. Since this module is a pure RF transceiver module, using an SPI interface, needs an MCU driver. This module can handle long-distance transmissions up to 3km with its IPEX/Stamp hole Antenna, making it an ideal choice for wireless data transmission applications. With an optimized design, it ensures a reliable and stable connection with low latency, while keeping power consumption to a minimum.
Main parameter
| Brand Name | EBYTE |
| Origin | Mainland China |
| Frequency | 868/915MHz |
| Type | SMD SPI Hardware Module |
| Model Number | E49-900M20S |
| Operating Temperature | -40℃-85℃ |
| Application | Smart Home |
| Package | SMD |
| Power supply voltage | Max:3.6V |
| Size | 20*14mm |
| Antenna | IPEX/Stamp Hole |
| Weight | 1.5g |
Technical manual download
Detailed parameters
| Main Parameters | Performance | Remarks | |
| Min. | Max | ||
| Power supply（V） | 2.6 | 3.6 | Voltage over 3.6V will cause permanentdamage to module |
| Operating temperature（℃） | -40 | 85 | / |
| Main Parameters | Performance | Remarks | ||
| Min. | Typical | Max | ||
| Operating voltage（V） | 1.8 | 3.3 | 3.6 | Over 3.6V may permanently burn the module |
| Communication level（V） | - | 3.3 | - | Using 5V level has the risk of burning |
| Operating temperature（℃） | -40 | - | +85 | Industrial design |
| Operating frequency（MHz） | 410 | 433 | 510 | - |
| TX Current(mA) | - | 85 | @Transmit power20dBm | Instant power consumption |
| RX current（mA） | - | 8.5 | - | - |
| Sleep current（nA） | 300 | 300 | 800 | Software is shut down |
| Max Tx power（dBm） | - | 20 | - | - |
| Receiving sensitivity（dBm） | -116 | -117 | -118 | @Air rate is 1.2kbps |
| Main parameter | Description | Remarks |
| Reference distance | 2.5km | Clear and open, antenna height 2.5 meters, air rate 2.4kbps |
| Crystal frequency | 26MHz | - |
| Packaging method | SMD | - |
| Communication Interface | SPI | - |
| Dimensions | 20*14mm | - |
| RF interface | IPEX/stamp hole | Equivalent impedance is about 50Ω |
| product weight | 1.2±0.1g | Clear and open, antenna height 2.5 meters, air rate 2.4kbps |
Pin parameters
| No. | Item | Direction | Description |
|---|---|---|---|
| 1 | GND | - | Ground |
| 2 | GND | - | Ground |
| 3 | GND | - | Ground |
| 4 | GND | - | Ground |
| 5 | GPIO1 | DI/O | Configurable multi-function IO port（see CMT2300A manual for details） |
| 6 | RXEN | DI/O | Configurable multi-function IO port（see CMT2300A manual for details） |
| 7 | TXEN | DI/O | Configurable multi-function IO port（see CMT2300A manual for details） |
| 8 | VCC | - | Power supply +3.3V |
| 9 | VCC | - | Ground |
| 10 | VCC | - | Ground |
| 11 | SCLK | DI | SPI clock pin |
| 12 | SDIO | DI/O | SPI data pin |
| 13 | CSB | DI | SPI register accesser |
| 14 | FCSB | DI | SPI FIFO accesser |
| 15 | GND | - | Ground |
| 16 | GND | - | Ground |
| 17 | ANT | - | RF module stamp hole interface，impedance 50Ω |
| 18 | GND | - | Ground |
