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硬件:
1、ADCREFP与ADCREFM引脚分别连接2.2uf 瓷片电容接模拟地;
2、ADCREFIN直接接模拟地;
3、ADCRESEXT连接2.2K电阻接模拟地;
4、ADCLO引脚直接接模拟地;
上电各个电源工作正常,使用TI的例程adc_seqmode_test进行调试(使用内部参考电压),出现这样的问题:A0输入0-3V,但是ADC结果寄存器转换值一直在1068附近跳变,没有跟随模拟输入电压变换,请问这是什么原因引起的,谢谢!