EByte E07-900M10S Sub-1GHz RF Transceiver Module (CC1101, 855-925MHz)

The module communicates with a host microcontroller via a 4-wire SPI interface (CSN, SCK, MOSI, MISO) supporting clock rates up to 10 MHz. Configuration and data transfer are performed by reading from and writing to the internal registers of the CC1101 chip using the SPI protocol, as detailed in the TI CC1101 datasheet and EByte's application notes.

The operating frequency within the 855-925 MHz band and the air data rate (0.6 to 500 kbps) are configured by writing specific values to the CC1101's frequency synthesizer and MDMCFG registers via SPI. Lower data rates like 1.2 kbps maximize range and sensitivity, while higher rates increase throughput. You must ensure your antenna is tuned for your chosen center frequency.

Use a 50-ohm antenna tuned for your specific operating frequency (e.g., 868MHz or 915MHz) with an IPEX (U.FL) connector. With a +10 dBm output, -108 dBm sensitivity, a properly matched antenna (like a 3dBi whip), and clear line-of-sight, you can achieve ranges up to 1.5 km. Range significantly decreases in urban or obstructed environments.

Configure the CC1101's WORCTRL register to set a periodic wake-up interval (e.g., 250 ms to 4 seconds). The module will sleep, consuming ~0.6 µA, and briefly wake its receiver to check for a predefined preamble signal. If detected, it fully wakes the host MCU via a GPIO interrupt. This minimizes average current for battery-powered sensors that only transmit data occasionally.

The module requires a stable 2.5V to 3.6V DC supply, with 3.3V being typical. During transmission peaks, it can draw up to 36mA, so your voltage regulator must supply this current without sagging. For battery operation, use a low-quiescent current LDO regulator. Decoupling capacitors (e.g., 10µF and 100nF) placed close to the module's VCC pin are essential for stable RF performance.