SLUSEG7B December 2021 – September 2024 BQ77207
PRODUCTION DATA
In the BQ77207 device, each cell input is monitored independently to determine if the input is connected to a cell or not by applying a 50-μA pull down current to ground that is activated for 128 μs every 128 ms. If the device detects that Vn < Vn-1 – VOW V, then a timer is activated. When the timer expires, the COUT and DOUT pins go from an inactive to active state. The timer is reset if the cell input rises above the recovery threshold (VOW + VOW_HYS). To recover both the COUT and DOUT 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 or UVP faults) need to be cleared as well.