BQ34110: FC not set at the end of charge

Emmanuel Tillol

Part Number: BQ34110

Hello,

I'm using a Nimh dT/dt as event for end of charge detection. (I'm using the FC bit to stop the charger.)

I had a strange issue that I didn't had previously: at the end of one charge, the FC didn't set and I overcharged my battery.

Is it a bug or does something in my configuration prevents the FC bit to be set at the dT/dt event?

(I attached the datalog file and the last gg.files from the autoexport)

datalog.zip 2084.datamemory.zip

over 6 years ago

0 Emmanuel Tillol over 6 years ago

Prodigy 155 points

Maybe, the FC set voltage is too high:

0 Bryan Kahler over 6 years ago in reply to Emmanuel Tillol

TI__Mastermind 25955 points

Hi Emmanuel,

I can't tell from the scales on the graph, but please ensure charging at a C/2 rate or higher.

The voltage threshold may be too high for the cell, please refer to the cell datasheet.

Also, please ensure that the Delta temp and delta temp time settings are set to catch the temperature increase at full charge.

With respect to the NIHM termination, you may also wish to enable NiDV/dt.

Sincerely,
Bryan Kahler

0 Emmanuel Tillol over 6 years ago in reply to Bryan Kahler

Prodigy 155 points

Hi Bryan,

it seems that the voltage threshold is too high, it will try again with a lower value.

Thanks,

Power management

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BQ34110: FC not set at the end of charge