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 a maximum transmit power of 20dBm, and users can set a lower output power to save power consumption. Works in the 850MHz~930MHz frequency band, including the commonly used 868MHz and 915MHz frequency bands. This module is a pure RF transceiver module and uses an SPI interface, so it requires an MCU driver. Using an IPEX/stamp hole antenna, long-distance transmission up to 3 kilometers can be achieved.
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
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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 |
