6DD1684-0GE0

6DD1684-0GE0

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厦门莫格电气自动化有限公司

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本

微控制器的一个双向引脚与CC1020的DIO连接,用于数据的发射与接收(输入与输出)。DCLK提供数据定时,必须连接到微控制器的一个输入端。

数据输出可以选择使用单独的引脚。这时要设置CC1020的INTERFACE寄存器SEP_DI_DO=1。在同步模式下,LOCK引脚用作数据输出,而DCLK引脚作为异步模式的数据输出,DIO引脚端则只用于数据输入。

微控制器的一个引脚可用来相环的锁定信号,即LOCK引脚信号。当锁相环锁定时,LOCK引脚为逻辑低电平。它还可以用作载波检测及它内部测试信号。

CC1020能被设置成三种不同的数据传输形式：同步NRZ模式、同步曼彻斯现难度也介于两者之间。考虑到微处理器基本都支持UART串行通讯,所以选择了这种模式,经测试效果完*达到要求。

CC1020天线选择

CC1020可以使用多种型号的天线。近程通信中常使用的天线是单极天线、螺旋型天线和环形天线。本设计使用范围且简单的1/4波长单极天线。

电源管理

CC1020提供了非常灵活的电源管理,以适应电池驱动应用中对功耗的严格要求。低功耗模式通过MAIN寄存器和POWERDOWN寄存器控制。MAIN寄存器中有独立的位,用于控制接收部分、发射部分、频率合成器和晶振。这种独立控制方式使得各个应用的功耗可以优化为zui小。由于本设计是单独的无线通信模块,所以对功耗要求不太严格。系统采用5V供电,经过NCP500稳定输出3V电压。

抗干扰措施

无线射频收发系统对电源噪声很敏感,因此设计时采用了无线射频部分和其它电路分开供电的方法。高频器件对于噪声敏感,因此给各部分电源加装了滤波器或稳压器,以减少电源噪声对芯片的干扰。另外,对芯片使用电源监控及看门狗电路,以便大幅度提高整个电路的抗干扰性能。

Chipcon公司提供了射频部分的电路参考设计,射频部分的布局参照了参考设计的布局,同时根据实际情况做了一些改动,以获得效果。CC1020的外围元件很少,其中VCO电感属于关键器件,选用了高精度电感,布局上也尽可能靠近芯片,并且尽可能使两个输入引脚对称,以保证性能。另外,设计时让晶振与芯片引脚尽量靠近,并用地线把时钟区隔离起来,晶振外壳接地并固定,还使用了金属罩对射频部分进行了电磁屏蔽。使用以上措施,保证了系统的可靠运行。

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