• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 702 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ27220: Learning/Accuracy after Dead Battery Scenario

Antonio Fadhel
Genius 9410 points
Part Number: BQ27220

Hi,

Since the BQ27220 stores some of the data parameters in volatile memory, our customer is concerned about the dead battery scenario. They are planning to go with a pack-side approach to keep the fuel gauge with the same battery so when they swap the old battery with a new one the aging characteristics follow.

The learned characteristics are written in volatile memory, correct? Can you comment regarding accuracy when it wakes up from a dead battery situation? Will the BQ27220 have to start learning the cell from scratch?

Thanks,

Antonio

  • 0
    TI__Guru* 76230 points
    Hi Anotonio,

    Their host will need non-volatile memory to store learned parameters and other configuration parameters like the EDV voltages. If power goes off like in the case of a dead battery, upon power on, the host needs to write the stored parameters back on the gauge otherwise the gauge will return to default and accuracy gets thrown off

    thanks
    Onyx