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Unable to establish I2C communication

Category: Hardware
Product Number: MAX17320G22+, MAX17320

Dear Team,

1) We have designed a battery management system using MAX17320G22+ as per the EVK for a Drone Sub-system. We tried to read some parameters like device name, manufacturer name etc. But we are unable to establish communication with the IC over I2C. we were using an external controller for the purpose. also we tried to run an I2C Scanner application from Raspberry Pi. Even that was not working.   

2) Also when batteries were connected to BMS, we are able to measure the voltage across the drain of charging MOSFET, but unable to measure any voltage across the PACK+ and PACK-, meaning that the charging MOSFET is turned ON when the BMS is connected to the cells, but the discharging MOSFET is not turning ON.  

Can someone help us find out where we went wrong?

Please help us resolve this issue ASAP.

Thank you.