The ULP Lead-On Detection has a requirement that the only path to ground on the leads is through the connection of the leads to a human body. If the computer connected to the MAX30001 EVSYS is plugged into a charger or docking station, then there is a separate path to Earth ground through the charger port. Therefore, the LONINT will stay active without clearing as long as this condition persists.
If evaluating the ULP Lead-On Detect feature, please ensure the host PC does not have a connection to Earth ground through a charger, docking station, or AC power outlet. As long as there is not additional path to ground for ECGP, the LONINT field should clear after the first read of the status register.