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Hi,
I am working on an EOG detection circuit using ADS1292. I could config ADS1292 and see the test signal(square wave), but the RLDOUT voltage and CH1/CH2 data output are strange under normal electrode input.
ads1292_Reg_Write(ADS1292_REG_RLDSENS, 0x20); RLDOUT is 1.65V with no AC components.
ads1292_Reg_Write(ADS1292_REG_RLDSENS, 0x2C); RLDOUT is average1.8V with 600mV sine wave(50Hz).
CH1/CH2 data output is usually near -1.7V or -2.42V; with small sine wave noise.
I am not sure whether the problem is due to my circuit design: RLD part and analog inputs(1N 1P 2N 2P); or it is due to the register configurations.
Unipolar supply: AVDD=3V; 2.42-V reference
ads1292_Reg_Write(ADS1292_REG_CONFIG1, 0x01);
ads1292_Reg_Write(ADS1292_REG_CONFIG2, 0xA0);
ads1292_Reg_Write(ADS1292_REG_LOFF, 0x10);
ads1292_Reg_Write(ADS1292_REG_CH1SET, 0x00);
ads1292_Reg_Write(ADS1292_REG_CH2SET, 0x00);
ads1292_Reg_Write(ADS1292_REG_RLDSENS, 0x23);
ads1292_Reg_Write(ADS1292_REG_LOFFSENS, 0x00);
ads1292_Reg_Write(ADS1292_REG_LOFFSTAT, 0x00);
ads1292_Reg_Write(ADS1292_REG_RESP1, 0x02);
ads1292_Reg_Write(ADS1292_REG_RESP2, 0x07);
ads1292_Reg_Write(ADS1292_REG_GPIO, 0x00);
Thank you for your support and advice
Best Regards,
Zhixia