SLUSDQ4 April 2019 BQ79606A-Q1
The drivers and protocol for the BQ79606A-Q1 is suitable to drive transformer and capacitor isolation for the daisy chain communication. The following sections detail the implementation for capacitor isolation. Note that both types of isolation are possible in a system, with no differences in the setup of each device. For example, it is possible to use transformer isolation between the low-voltage and high-voltage boundary for galvanic isolation, while using capacitor isolation between modules in the stack. The figure below shows capacitive isolation with and without choke. The choke adds additional robustness during BCI noise and long cable applications. With the capacitor plus choke, a 300mA BCI noise can easily be achieved. For capacitive only isolation, up to 200mA BCI with 1.7m cable can be achieved.