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锐能微 RN8209(老版)应用笔记
目录
概述........................................................................................................................................................3
硬件电路设计........................................................................................................................................4
采样电路........................................................................................................................................4
基准电压电路................................................................................................................................5
晶振电路........................................................................................................................................5
复位电路........................................................................................................................................6
SPI/UART 通信接口电路.............................................................................................................7
脉冲输出电路................................................................................................................................7
可靠性设计............................................................................................................................................8
强电区域........................................................................................................................................8
电源和复位....................................................................................................................................9
通信接口......................................................................................................................................10
脉冲输出......................................................................................................................................10
晶体..............................................................................................................................................11
软件设计..............................................................................................................................................11
上电配置步骤..............................................................................................................................11
运行中计量芯片参数校验..........................................................................................................11
SPI 通信接口...............................................................................................................................12
校表方法..............................................................................................................................................17
脉冲法校表步骤及算法..............................................................................................................18
功率校表法步骤及算法..............................................................................................................20
有效值 offset 校正.......................................................................................................................21
启动功率设置..............................................................................................................................22
直流测量的应用..................................................................................................................................22
1.确定基本参数:合适的 hfconst 值,校表参数清为默认值.................................................22
2. 直流 offset 校正.......................................................................................................................23
3.有效值 OFFSET 校正...............................................................................................................24
4.电压、电流、功率转换系数确定:......................................................................................24
5.增益校正...................................................................................................................................24
电能双路计量的实现..........................................................................................................................24
..............................................................................................................................................................25
应用注意事项......................................................................................................................................26
深圳市锐能微科技有限公司 page 2 of 26 Rev 2.2