EByte E49-900M20S 850-930MHz Sub-1GHz RF Transceiver Module

The module communicates exclusively via a 4-wire SPI interface (SCLK, MOSI, MISO, CS). You must connect these pins to corresponding SPI pins on your host MCU (e.g., an Arduino, STM32, or ESP32). Ensure the module's VCC (2.6-3.6V) and GND are properly powered, and remember that the module requires specific driver code to initialize the CMT2300A chip and manage RF operations, as it is a pure hardware transceiver.

Frequency, output power, data rate, and other RF parameters are configured by writing values to the CMT2300A chip's internal registers via SPI commands. You must implement the register map detailed in the CMT2300A datasheet within your MCU firmware. The frequency can be set anywhere within the 850-930MHz range, and transmit power is adjustable from the maximum 20dBm down to lower levels to conserve battery life in your application.

During transmission at maximum 20dBm power, the module draws approximately 85mA from a 3.3V supply. When actively receiving, current draw is significantly lower. For ultra-low-power operation, you can put the module into sleep mode, where it consumes a mere 300 nanoamperes (nA). Effective power management involves cycling between short active periods for communication and long sleep periods, managed entirely by your host MCU firmware.