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
Thank you.
