ADC电压过低ADC电压检测电路

然后讨论了分压电路在嵌入式系统中的应用，包括电池电压检测、ADC输入电压范围扩展和系统保护。STM32的DAC和ADC模块具有以下特点:通常STM32的DAC模块具有两个通道，分辨率为12位，可以输出0到参考电压之间的任何电压值，MIC的输入检测电路如附图所示，MIC的偏置电压由8K电阻R9提供，MIC的输入信号经单电源运算放大器LM224放大51倍后，经R11和C18组成的低通滤波后送入MCU进行ADC采样。

价值；RCC-u 003 eahbenr | = RCC _ AHBENR _ DMA1EN；AD _ DMA channel-u 003 eccr u 0026 = DMA _ CCR _ EN；AD _ DMA channel-u 003 eccr = 0；AD _ DMA channel-u 003 ECN DTR = 0；AD _ DMA channel-u 003 ecpar = 0；AD _ DMA channel-u 003 ecmar = 0；DMA 1-u 003 eifcr | = DMA _ channel 1 _ IT _ Mask；tmpreg = AD _ DMA channel-u 003 eccr；tmpregu 0026 = DMA _ CCR _ CLEAR _ Mask；tmpreg | =（DMA _ DIR _ peripheral src | DMA _ Mode _ Circular | DMA _ peripheral Inc _ Disable | DMA _ memory Inc _ Enable | DMA _ peripheral datasize _ half word | DMA _ memory datasize _ half word | DMA _ Priority _ High | DMA _ M2M _ Disable）；AD _ DMA channel-u 003 eccr = tmpreg；AD _ DMA channel-u 003 ECN DTR = ADC _ DMA _ BUFF _ SIZE；AD _ DMA channel-u 003 ecpar =（U32）u 0026 ADC 1-u 003 edr；AD _ DMA channel-u 003 ecmar =（U32）ADC _ DMA _ buff；AD _ DMA channel-u 003 eccr | = DMA _ CCR _ EN；DMA mux 1 _ channel 0-u 003 eccr = 5；。