• 多波段收音音响采用全波段FM/LW/MW/SW接收芯片Si4735,能否共用系统提供的的24MHz时钟?

  • 创建于2015-09-29

1个回答

  • _世强 (0)
    Si4735芯片可以采用24MHz外部时钟源输入作为参考时钟,软件设置按如下操作:1、Power Up命令中参数ARG1 XOSCEN位置0,Disable内部晶体振荡器,接收外部时钟输入;2、通过内部分频器Prescaler 1~4096的整数分频来完成时钟分频,使输入时钟分频后频率落在32.768KHz±5%范围内;3、由于外部输入时钟为24MHz,通过计算Prescaler设为750,24MHz/750=32000Hz可满足32.768KHz±5%范围内,因此将属性0x0201 REFCLK_FREQ设为0x7D00(32000),0x0202 REFCLK_PRESCALE设为0x02EE(750),去掉原先的32.768KHz晶体并修改软件后测试,Si4735芯片Power_Up正常,可以正常接收空中电台,问题解决。
    创建于2015-09-29

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