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AFE4404: AFE4404 Calibration code initCalibrationRoutine()

Part Number: AFE4404


I was looking at the code Calibration_AFE4404.c initCalibrationRoutine() and left a question.

Can you tell me why the formula below came out?

Why do you save it in four variables using hysteresis percent: LOW_THR_HYS_LOW, LOW_THR_HYS_HIGH & HIGH_THR_HYS_LOW, HIGH_THR_HYS_HIGH?