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Problem in SMBus communication with bq20z90 Gas Gauge

neo trinity
Prodigy 190 points

Hi!!

I am using bq20z90 EVM with bq29330. I have listed out the observations i found below:

1) I have connected 4 cells to 1N,1P,2P,3P and 4P respectively. I have no VCC at this point,

2) I gave 14v to PACK+ , now i get 2.5v in VCC; Even when i switch the PACK+ voltage off, i get the VCC voltage.

3) i use EV2300 for connecting SMBus of bq20z90 with PC. I have installed the software and drivers also, and my system recognizes TXbqxx river when i plug the usb cable.

 

PROBLEM :  When starting the software, it gives either of the following error message.

1) Communication Error = No acknowledgement  VB_T2H_NACK.

2)Communication Error = VB_COMMUNICATION_TIMEOUT.

I don't understand, what is going on ?

Please help me out !!!!