Part Number: ADS1292R Hi, I'm using ads1292R to acquire the patient chess impedance. I debug the ads1292R impedance in ourselves PCBA. I connect a const 50Ω to the ads1292R and read the impedance value from ads1292R . But the read impedance values keep increasing(or decreasing) after start-up with the time increase, perhaps after about more than 1.5 hours the impedance value will remain unchanged. For example, a successive measured impedance values is like this: the values are -4469 ...... -5744 -5744 ...... 6373 ...... -8836 -8836 -8804 -8804 -8839 I use the ads1292R Front end EVM to measure the impedance, it is good and keeps stability after start-up. My register setting is like this, //Device ID read Ony 0x00, //CONFIG1 0x02, //CONFIG2 0xB0, /* Leave the lead off comparator disable and external reference buffer enable in CONFIG2. VRef 4.033v */ //LOFF 0x10, /* Leave the LOFF register at default. */ //CH1SET (PGA gain = 6) 0x00 //CH2SET (PGA gain = 6) 0x00, //RLD_SENS (default) The aed doesn't need the RL drive todo 0x2c, //LOFF_SENS (default) 0x0F, //LOFF_STAT 0x00, //RESP1 0xEA, /* 112.5 degree */ //RESP2 0x03, //GPIO 0x0C So what is the possible reason that the impedance keep changing? Thank you.
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