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
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- _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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