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ADS1278: ads1278使用中来回开关机后偶尔出现5v供电脚被拉低到2v

Part Number: ADS1278

ads1278使用中来回开关机后偶尔出现5v供电脚被拉低到2v多 芯片发热 重新上电后正常,请问是什么原因造成的,5v是LDO提供的

  • 您好,

    “使用中来回开关机”是指来回给设备 ADS1278的AVDD, DVDD, and IOVDD三个供电端来回上下电吗?建议用示波器测量下AVDD, DVDD, and IOVDD的上电顺序,ADS1278对上电顺序有要求,见datasheet Figure 84. Start-Up Sequence

    同时也看下上下电过程中,是否有脉冲超过了spec 规定的绝对最大额定电压值: