BQ25171EVM: BQ25171 7-Cell NIMH BATTERY CHARGE

user4863518

Prodigy 140 points

Part Number: BQ25171EVM

When charging 7-cell NiMH rechargeable batteries with the BQ25171 EVM
STAT1 and STAT2 both go LOW.

I think the above is due to VOUT < VRECHG.
Is there any way to recover this condition and charge normally?

over 2 years ago

+1 Nick Brylski over 2 years ago

TI__Mastermind 19195 points

Hello,

For non-recoverable faults, an input supply or CE pin toggle is required to attempt charging after the fault is detected. You may want to raise the charge current or increase the charge timer to avoid this.

Best regards,

Nick

0 user4863518 over 2 years ago in reply to Nick Brylski

Prodigy 140 points

Thank you for your answer.
Regarding the CE pin toggle above, it is usually I usually set it to LOW, so should I drive it from High to Low? Is it enough to drive it from High to Low?

+1 Nick Brylski over 2 years ago in reply to user4863518

TI__Mastermind 19195 points

Hi,

When charging is enabled /CE is pulled low, so to toggle /CE you will need to drive it high then low. Note that the pin is also internally pulled low when left floating.

Best regards,

Nick

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BQ25171EVM: BQ25171 7-Cell NIMH BATTERY CHARGE