Hello！great TI engineer：
I have been debugging ADS1291 for a month now,The main problem now encountered is the failure to collect ECG signals from the human body.
I hope you can give me some suggestions and help me to locate where the problem is. I have almost no direction.
The product that is currently being developed is a wearable device that uses the ADS1291.The ECG signal on the ECG simulator can now be acquired.The ECG signal is as follows:The waveforms drawn using matlab are the raw data above and the filtered data below.
The following is the collection of ECG data on the wrist, no ECG signal，The waveform is as follows, and the original data is in the attachment. The waveforms drawn using matlab are the raw data above and the filtered data below.
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The schematic of ADS1291 is as follows:The positive electrode of channel 1 and the electrode driven by the right leg are in contact with the wrist of the left hand; the electrode of the negative electrode of channel 1 is in contact with the electrode pad with the index finger of the right hand when measuring.
The settings of 11 registers (0x01~0x0B) are as follows: 0x02-0xe0-0xf0-0x00-0x81-0x20-0x03-0x00-0x02-0x07-0x0c,Tested with a multimeter, DVDD, AVDD, voltage is normal, lead break detection can also be detected, and 6 bytes of ECG data is acquired using the continuous reading data mode.Use battery power。My physical map is as follows, add some DuPont lines for download and serial print ECG data, only after the data is printed after the collection, when the collection of data is not wired to the outside.
1.What should I do by the above description of me?
2.How to verify that the right leg driver is connected and function?
3.Please give me some suggestions ！ The signal of the simulator can be collected. The signal of the human body should be similar, but the normal ECG signal cannot be acquired. I tried to adjust the Lead-off current magnitude and Channel 1 PGA gain.
4.The datasheet has been read many times, and I have noticed many details. For example, the read data is complemented and the SPI clock is set to 1MHZ. The ADS1291 uses an internal clock of 512KHz.，Can you outline which details need attention?
think you . Looking forward to your reply. Shenzhen, China！
