笙科最新低频段无线射频芯片A7139资料,包括C源代码 中文手册 芯片可运行在 315/433/470/510/868/915MHz的 ISM 频段 数据率可编程从 2K 到 250Kbps(Sheng Ke's latest low-frequency radio frequency chip A7139 data, including C source code, Chinese manual chip, can run in the ISM frequency band of 315/