输入频率HZ占空比x%实测电压V010020030040050060070080090010001500200025003000350040004500500054001234567891014192428333842475100.1850.370.5550.740.9251.111.2951.481.6651.852.7753.6994.6245.5496.6747.3998.3249.2489.988理论电压U占空比计算方法fclk=10.8kHZ0为保证一个时钟周期只对积1个fclk周期),外部频率信号高电平周期必须在1-2个0.185fclk周期之间.所以要根据输入频率信号计算其高电0.37占空比0.555理论电压U计算方法0.740.9251.111.2951.481.6651.852.7743.6994.6245.5496.6747.48.3239.2489.9881/fin*x%=1/fclk占空比 x=fin/fclk*100只对积分电容充电一次(充电时间
),外部频率信号高电平周期必须在1-2个间.所以要根据输入频率信号计算其高电平
U=fin/(0.5*fclk)*9.988