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CD74HC4046AM需要用到比较器1和比较器2,电路图设计是在芯片3号脚和14号脚直接接进同频率不同占空比的方波,16号脚接5V供电,8号脚接GND,比较器1输出对应的脚2和比较器2对应的脚13拉出来,这么设计能不能输出电压波形。
看CD74HC4046AM供电电压是2V-6V的那么芯片的16号引脚供电是不是能接3.3V然后输出脚2号和13号脚是不是可以直接进到28335的捕捉口。