Dear TI Experts,
My customer want to design a 7S pack with BQ40z80. They need external cell balancing function and find the example schematic in BQ40z80 Technical Reference as below.
They found that every capacitance from Vcell Pin is connected to GND, however,
in the BQ40z80RevA Schematic from bq40z80EVM, the internal cell balancing schematic demo, the capacitance is connected to adjacent Vcell Pins.
Are these two schematics both right,external cell balancing need Vcell PINs capacitance to GND, and internal cell balancing need Vcell PINs capacitance to adjacent PINs?
Thanks a lot.
the demo of external cell balancing schematic from BQ40z80 TRM:
the demo of internal cell balancing schematic from BQ40z80EVM :