In the BQ77205 device, each cell input is monitored independently to determine if the input is connected to a cell or not by applying a 50-μA pulldown current to ground that is activated for 128 μs every 128 ms. If the device detects that Vn < Vn-1 – V_OW V, then a timer is activated. When the timer expires, the OUT pin goes from an inactive to active state. The timer is reset if the cell input rises above the recovery threshold (V_OW + V_{OW_HYS}). To recover the OUT output from active to inactive state, the open wire fault must be cleared (such as the broken connection from the device to the battery needs to be restored), and any other remaining faults (such as existing OVP fault) need to be cleared as well.