BQ29700EVM-610: bq29700 Zero voltage charging

Ian Wang

Mastermind 29465 points

Part Number: BQ29700EVM-610
Other Parts Discussed in Thread: BQ2970

Hi Sir,

Would you pls advise if Vbat between 1.7V and 0.75 will doesn’t be charged?

Thanks, Ian.

over 4 years ago

0 Shawn Hinkle over 4 years ago

TI__Expert 7375 points

Hi Ian,

The BQ2970 has a 0-V battery charge feature, which means that the device will allow charging when the battery voltage is in between 0.75V and 1.7V.

0 Ian Wang over 4 years ago in reply to Shawn Hinkle

TI__Mastermind 29465 points

Hi Shawn,

What means as d/s table shows 1.7V is min. ,0.75V is Max.?

Thanks. Ian.

0 Shawn Hinkle over 4 years ago in reply to Ian Wang

TI__Expert 7375 points

Hi Ian,

This value is to identify the range for this feature. The function will start when the battery depletes to 1.7V, and stops when the battery reaches the value of 0.75V.

0 Ian Wang over 4 years ago in reply to Shawn Hinkle

TI__Mastermind 29465 points

Hi Shawn, When Bat. Voltage lies in 0.75~1.7V ,will BP IC allow or forbidden it to be charged? Thanks, Ian.

0 Shawn Hinkle over 4 years ago in reply to Ian Wang

TI__Expert 7375 points

Hi Ian,

Charging will be allowed if the charger voltage is >1.7V.

0 Ian Wang over 4 years ago in reply to Shawn Hinkle

TI__Mastermind 29465 points

Hi Shawn,

Is it means charging will be forbidden when bat. voltage lies in 0.75~1.7V ?

Thanks, Ian.

0 Ian Wang over 4 years ago in reply to Ian Wang

TI__Mastermind 29465 points

Hi Shawn,

I confuse it,

You mention "Charging will be allowed if the charger voltage is >1.7V.", but how about "when battery drop below 1.7V but >0.75V"?

Thanks, Ian.

0 Shawn Hinkle over 4 years ago in reply to Ian Wang

TI__Expert 7375 points

Hi Ian,

If the battery cell is greater than 0.75V, and the charger voltage is greater than 1.7V, the device will charge. Once the battery cell drops below 0.75V, or the charger below 1.7V, then charging will stop.

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BQ29700EVM-610: bq29700 Zero voltage charging