BQ76952: BQ76952

Hello Rohit,

1. What kind of setup is required for cell balancing test in Lab as well in the production line.
Real cells are usually required to test for cell balancing. Although we have cell simulators (voltage divider with resistors) to simulate the cells in our EVM, for cell balancing the cells need to maintain their voltage at the current draws that happen during cell balancing. So real cells are needed, and once configured and tested in lab, the cells should be similar to those in production.

2.Can is use led indication for corresponding cell during cell balancing? without using MCU 
Yes, if using external cell balancing, this should be easy to implement. by adding the LED and current-limiting resistor in parallel with the balancing current path. If not using external cell balancing, it could be possible to do so too although it may be less flexible in component selection. Albeit for a different part, we do have something like this in our bq77915EVM User Guide (using no external balancing).

3.Maximum Stub length allow in PCB Layout from R sense resistance to SRP and SRN pin of IC.
Ideally you want to make this as short as possible. Make sure to match both traces and place filter components as close as possible to the IC. See Section 18.1 Layout Guidelines of the datasheet for sense resistor layout recommendations. There is no tested maximum length allowed, but the performance can be impacted the longer the traces are. It is also important to match both trace lengths to minimize errors.

Best Regards,

Luis Hernandez Salomon