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reading a battery with the bq27425 Fuel Gauge chip

Richard Brisk
Intellectual 310 points

I am down to what I hope is my last problem in using the bq27425 Fuel Gauge chip. The problem is that I do not get usable values in response to the commands that relate to the battery capacity. Specifically, I get zero (0) for

NominalAvailableCapacity 0x08/0x09,

FullAvailableCapacity 0x0A/0x0B,

RemainingCapacity 0x0C/0x0D, and

FullChargeCapacity 0x0E/0x0F.

 

And most troubling of all I get 0 (zero) as the value for

StateOfCharge during the first 5 minutes of inquiry (if the battery is charging) and then I get 100% forever after. 

In addition, I get 0 (zero) for all inquiries of StateOfCharge always if the battery is discharging when connected to a load without being simultaneously charged.

 

Furthermore the StateOfHealth 0x20/0x21 always reads 0x100 (even though the spec claims that its max is 0x64)

 

I am having so many problems related to reading the battery that I feel that I need to speak directly to an expert.  I have tried putting my questions on the E2E bulletin board before, but I do not get the help I need.  Can I please get connected to an expert.

 

I am Richard Brisk a design engineer at Kopin Corp. 

The phone at my desk is (508) 870-5959 x117

My personal cell phone is (774) 270-0093

My email is RBrisk@Kopin.com

 

Please call or write with information as to how I can connect with an expert directly.

 

Thank you,

Richard Brisk