BQ76952: Adding Zener and Schottky in cell balancing circuit

Hi Mohammed,

The BQ76952 has high voltage tolerant pins on all cell inputs except VC0.  See the data sheet section 16.3 https://www.ti.com/document-viewer/BQ76952/datasheet/GUID-3DD37D93-6953-4094-8F3B-25E619185CEE#TITLE-SLUSE13T6110883-51 The designer for TIDA-010208 chose to connect Cell0 separately from BAT-, so the voltage may not be controlled between Cell0 and BAT- during cell connection, so VC0 was protected from overvoltage by D10 and undervoltage by D9.  If Cell0 were connected to BAT- on the board the diodes would not be used on VC0.