说明：  nRF905是一款单片型射频收发芯片，其工作于433/868/915MHz的ISM频 段。芯片内置集成频率合成器、解调接收链、功率放大器、晶体振荡器和调制器 以等功能模块.
(nRF905 is a single-chip RF transceiver chip, which works in the ISM band 433/868/915MHz. Integrated chip frequency synthesizer, demodulator receiver chain, power amplifier, crystal oscillator and a modulator, such as function modules.)