Forums

There is a connector connection labeled as PACK+ on the bq20z90 EVM. Apply Vstartup voltage to that connector pin.

Jackie, 

I think there is a miscommunication here.  I know Vstartup must be applied to the PACK+ when using the bq20z90/bq29330 chipset.  The question I want you to answer is, "When the bq20z90/bq29330 chipset is used as a battery management solution what is the source of Vstartup that gets applied to the PACK+ pin?     Based on you existing answer it would lead me to believe the bq20z90/bq29330 requires a separate battery just to provide Vstartup to the PACK+ pin!

Regards,

Kyle

In the field, the power source for PACK+ is the charger.

When the battery cells are connected to the pcb the first time (during assembly in manufacturer factory), user can use a charger to just start the system. The device is on and there is no need to have a power source on PACK+. You will need to connect to the charger again if you want to start the device from a shutdown command, or if the battery voltage is below termination voltage (in that case, you will need a charger to charge your battery anyway).

That makes more sense now...Thanks

Hi Jackie!!

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 !!!!