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ADS1255 转换数据在低电压的时候不稳定的问题

Other Parts Discussed in Thread: ADS1255

ti你好,

我目前使用ads1255的芯片进行电压采样

寄存器配置如下:

STATUS = 0x36
MUX = 0x08
ADCON = 0x20
DRATE = 0xa1
IO = 0xe1

电路上,aincom接地,然后我采样的是单端采样的方式,SYNC-》WAKEUP,等待DRDY低电平,然后发送RDATA-》STANDBY

首先请问,这样的设计方案和寄存器配置是否合理

第二,sps的设置会对采样精度有影响吗?

如下是我采集到的数据,连续采集20次,最后一个是平均值,1v以上输入电压,相对来说,偏差正负21mv

当我降低输入电压,那么连续采集到的偏差就比较大了,单位均为mv