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请教:关于ADS1299的SRB1和BIAS连接问题和内部测试方波问题

Other Parts Discussed in Thread: ADS1299, ADS1299EEGFE-PDK

尊敬的工程师:

我正在使用TIADS1299芯片开发EEG系统,我们的目标是:用8个通道的P级采集8路脑电信号,将8个通道的N级通过内部配置映射到SRB1上通过电极连接左耳垂,然后将右腿驱动BIAS电极引出来连接右耳垂。这是我们的配置信息:

ADS_REG(WREG|CONFIG1,0x96);  //250HZ

ADS_REG(WREG|CONFIG3,0XEC);//内部参考电压

ADS_REG(WREG|CH1SET,0X30);//通道1—8普通输入,6倍

 ADS_REG(WREG|CH2SET,0X30);

ADS_REG(WREG|CH3SET,0X30);

ADS_REG(WREG|CH4SET,0X30);

ADS_REG(WREG|CH5SET,0X30);

ADS_REG(WREG|CH6SET,0X30);

ADS_REG(WREG|CH7SET,0X30);

ADS_REG(WREG|CH8SET,0X30);

ADS_REG(WREG|CONFIG4,0X02);

ADS_REG(WREG|LOFF,0X00);  //LOFF Setting

ADS_REG(WREG|LOFF_SENSP,0XFF);

ADS_REG(WREG|LOFF_SENSN,0XFF);

ADS_REG(WREG|LOFF_FLIP,0X01);

ADS_REG(WREG|BIAS_SENSP,0X06);// RLD Setting

ADS_REG(WREG|BIAS_SENSN,0X02);

现在的问题是:

1.检测到的数据画图后接近直线接触人体后轻微波动,不像是脑电波,请各位工程师帮忙看看我们寄存器配置正确吗?如果不对,需要如何调整?

2.麻烦看一下我们的接线方式是否正确?

 

3.我们发现另外一个问题,如果测试ADS1299内部方波,配置ADS_REG(WREG|CONFIG2,0XD0); 

ADS_REG(WREG|CH1SET,0X05);,结果得到的值转换成电压后,波形幅度是正确的,可是基线有偏移,波形y轴中点没有在0处,而且每一路偏移都不同,如图:

 

请各位工程师帮帮我们,谢谢了!

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