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AFE4300: Impedance baseline variations

Part Number: AFE4300

Hi,

I am trying to measure Bio-impedance using AFE4300 BCM channel in FWR mode. After resetting the microcontroller, AFE is taking large time (in order of 10s of seconds) to settle to the final impedance value. Sometimes impedance measured keeps increasing without an upper bound. 

Could you let me know if this is due to the slow charging of a capacitor on the board or something else?