Based on the bq76940EVM we have developed our own BMS, which works fine while discharging the battery. We are facing problems while charging the battery. The REGOUT from the AFE (2.5V) which powers the host bq78350 is getting affected only when the charger is connected. A noise of 100Khz is getting induced.
This causes SMBus communication to go haywire since the host is not powered properly. When connected with the EV2300 it shoots up "Not able to find a free communications adapter" error.
Tried probing just the charger we got a perfect DC. Any ideas what is causing the problem ?