【经验】如何提高雅特力32位MCU AT32F403RCT7在ADC采集信号的精度
雅特力32位MCU AT32F403RCT7采用高性能ARM Cortex-M4F内核,工作频率240MHz主频,高度集成的软硬件资源同ST、GD等32位品牌MCU高度兼容,广泛使用于工业自动化,人工智能控制及消费类等应用领域。本文主要介绍雅特力32位MCU AT32F403RCT7的ADC如何通过硬件设计电路来提高测量精度。
根据雅特力官方的提供芯片资料,在100Pin及以上引脚数量的MCU可以独立采用VREF基准电压,ADC采集精度高;而100Pin以下的MCU的VREF基准电压则采用芯片VDDA提供。这样由于供电电压的不稳定会直接导致ADC基准电压误差变大。AT32F403RCT7芯片ADC基准电压采用VDD供电方案,下图以ADC采集高阻信号为例,来提高ADC采集精度。如下图1。
图1 ADC采集电路图
首先,在ADC采集信号加0.1μF电容精度测试。在某客户测试过程通过接0.1μF电容与不接电容测试结果来分析。如下图2,可以使用ADC快速采样而不需要特意延长ADC采样时间同时也起到虑波功能。
图2 测试结果
采用AT32F403RCT7芯片设计PCB时,PCB设计尽量要减小电源噪声,主要在电源端采用小容量的电容过滤高频率的噪声,大容量的电容过滤低频率的噪声。在靠近芯片端采用10nF+1μF瓷介电容来设计。
图3 芯片供电电路
综上所述,在采用雅特力AT32F403RCT7芯片ADC采集信号,通过上述的硬件设计方法可减小PCB由于电源引起噪声,提高ADC采样的精度。
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雅特力(Artery)AT32全系列32位微控制器(MCU)选型指南(英文)
目录- Company Profile AT32 MCU Family AT32 MCU Series Development tools
型号- AT-SURF-F437,AT32F413CCU7,AT32F437ZCT7,AT32A403ACGU7,AT32F405CCU7,AT32F403A SERIES,AT32F405 SERIES,AT32F407 SERIES,AT-START SERIES,AT32L021K6U7-4,AT32F421K6T7,AT32F437VMT7,AT32F425R8T7,AT32F437RGT7,AT32F423VBT7,AT32A403ACGT7,AT32F423RBT7-7,AT32F413CBT7,AT32F435CMT7,AT32F403ARCT7,AT32L021C4T7,AT32F435RCT7,AT32F435ZGT7,AT32F405CCT7,AT32F403ACET7,AT32F435 SERIES,AT32L021K8T7,AT32F437 SERIES,AT32L021F8P7,AT32F435CMU7,AT32F413CBU7,AT32F415KBU7-4,AT32F402CBT7,AT32F405KCU7-4,AT32F407RCT7,AT32F403ACGU7,AT32L021G4U7,AT32F425K8U7-4,AT32F402KBU7-4,AT32F415RCT7,AT32F425R8T7-7,AT32F423VCT7,AT32F402CBU7,AT32F423T8U7,AT32F425K6T7,AT32F405RBT7,AT32A403ARCT7,AT32F421K6U7,AT32F415RBT7-7,AT32F421G8U7,AT32F421F4P7,AT32F413KCU7-4,AT32F423C8T7,AT32F425F6P7,AT32A403ACEU7,AT32F421 SERIES,AT32F423 SERIES,AT32F437VGT7,AT32F437ZMT7,AT32F423RCT7-7,AT32F421K8T7,AT32F4212C8T7,AT32F413C8T7,AT32F415RBT7,AT32F403ARET7,AT32F435CGT7,AT32A403ACET7,AT32F435VCT7,AT32F403ACGT7,AT32F421C4T7,AT32L021K6T7,AT32F403AVCT7,AT32L021F6P7,AT32F415RCT7-7,AT32F435CGU7,AT32F405KBU7-4,AT32F407VCT7,AT32F415CCT7,AT32F405CBU7,AT32F415KCU7-4,AT32F407RET7,AT32F415 SERIES,AT32F435RMT7,AT32L021K8U7,AT32L021,AT32F423C8U7,AT32A403A SERIES,AT32L021F8U7,AT32F425K8T7,AT32F405CBT7,AT32A403AVCT7,AT32F421K8U7,AT32A403ARET7,AT32F423TBU7,AT32F421K6U7-4,AT32F421F6P7,AT32F403A,AT32F402 SERIES,AT32A403ACCU7,AT32F415CBT7,AT32F415R8T7,AT32F425F8P7,AT32A403A,AT32F437ZGT7,AT32F423R8T7,AT32F425C6U7,AT-START,AT32F421K4U7-4,AT32F437RCT7,AT32F423CCU7,AT32F402RCT7,AT32F403ARGT7,AT32L021C8T7,AT32WB415CCU7-7,AT32F415CCU7,AT32A403ACCT7,AT32F403AVET7,AT32F435VMT7,AT32F435RGT7,AT32F421C6T7,AT32L021K4U7-4,AT32F423TCU7,AT32L021K4T7,AT32F405RBT7-7,AT32F413KBU7-4,AT32F435ZCT7,AT32F423CCT7,AT32WB415,AT32L021F4P7,AT32L021G8U7,AT32F407VET7,AT32F407RGT7,AT32F413 SERIES,AT32F403ACCU7,AT32L021K6U7,AT32F423CBU7,AT32F415CBU7,AT32L021K8U7-4,AT32A403AVET7,AT32L021F6U7,AT32F425C6T7,AT32F425K6U7-4,AT32F4212 SERIES,AT32F421G4U7,AT32A403ARGT7,AT32F425 SERIES,AT32F421F8P7,AT32F423CBT7,AT32F413RCT7,AT32F425R6T7-7,AT32F413,AT32F423V8T7,AT32F415,AT32F437VCT7,AT32F402CCT7,AT32F423KCU7-4,AT32F421K4T7,AT32F425C8U7,AT32WB415 SERIES,AT32F425R6T7,AT32F423RBT7,AT32F423K8U7-4,AT32F421,AT32F402,AT32F435VGT7,AT32F405,AT32L021C6T7,AT32F407,AT32F402CCU7,AT32F421C8T7,AT32F435CCT7,AT32F403AVGT7,AT32F405RCT7,AT32F403ACCT7,AT32F423R8T7-7,AT32F435ZMT7,AT32L021 SERIES,AT32F4212,AT32F413RBT7,AT32F405RCT7-7,AT32F415C8T7,AT32F402RBT7-7,AT32F435,AT32F437,AT32F407VGT7,AT32F435CCU7,AT32L021G6U7,AT32,AT32F402RCT7-7,AT32F403ACEU7,AT32F415K8U7-4,AT32L021K4U7,AT32F415R8T7-7,AT32F423RCT7,AT32F402KCU7-4,AT32F402RBT7,AT32F423,AT32F425,AT32F413CCT7,AT32F421K4U7,AT32F421K8U7-4,AT32L021F4U7,AT32F425C8T7,AT32F437RMT7,AT32A403AVGT7,AT32F421G6U7,AT32F423KBU7-4
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现货市场
服务
可定制显示屏的尺寸0.96”~15.6”,分辨率80*160~3840*2160,TN/IPS视角,支持RGB、MCU、SPI、MIPI、LVDS、HDMI接口,配套定制玻璃、背光、FPCA/PCBA。
最小起订量: 1000 提交需求>
可定制PCB最高层数:32层;板材类型:罗杰斯高频板/泰康尼高频板/ZYF中英天线板/F4B高频板/高频电路板/高频混压板/高频纯压板等;最大加工尺寸:609*889mm。
最小起订量: 1 提交需求>
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