• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 3 answers
  • Subscribers 63 subscribers
  • Views 761 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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: Which pre-programmed profile to select?

user5764337
Prodigy 30 points
Part Number: BQ27220
Other Parts Discussed in Thread: BQSTUDIO, GPCCEDV

Hi,

we are using the BQ27220 together with a Li-Ion battery from Jauch (LP103450JH). Can I use one of the six preprogrammed profiles (described in section 2.1.13 of sluubd4.pdf) with this battery?

Perhaps related, there is a battery identification setting (the lowest 3 bits in the CONTROL_STATUS register). Do i have to set this, and to which value?

Many thanks in advance,

David

  • 0
    TI__Guru* 76230 points
    Hi David,
    Yes and Yes. The voltage profile is used to estimate SOC upon wakeup of the gauge from shut down mode. That is about it. This estimate will be a rough estimate and the gauge has to learn FCC to have better accuracy. FCC is learned by discharging down to empty.
    Hope this helps
    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 30 points
    Hi Onyx,
    but, which one of the six profiles should I pick? In other words, which one does fit my particular battery best?
    Perhaps I should mention that I didn't do any of the calibration or profiling steps with bqstudio yet - the bq27220 is in the state we received it from the factory. I am just wondering whether I can start right away, perhaps only configuring some basic parameters like battery capacity and omitting complicated processes like the gauging parameter calculation.
    Thanks,
    David
  • 0 in reply to user5764337
    TI__Guru* 76230 points
    Hi David,
    You cannot ommot those processes listed in gpccedv otherwise your gauge will not properly work.
    You need to choose a profile which seems closest to the voltage profile of your cells.
    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 30 points

    Hi Onyx,

    thanks, I will do the gpccedv process next. I was just hoping there is a way around it ;-)

    But I still don't understand how to use the profile selection command. It offers six profile selections (SET_PROFILE_1 - 6); which profiles are these?

    And what values are to be used for the battery identification of the CONTROL_STATUS register?

    Thanks,

    David

  • 0 in reply to user5764337
    TI__Guru* 76230 points
    hi David

    You can choose the table that seems closest to your cell. There isn't really any formal guideline but look at the OCV curve of your cell and compare it to the ocv curve of the chem ids and go from there. Note that these OCV tables are generic and only used once for initialization when the gauge wakes up from shutdown mode so the gauge can estimate soc. after that they gauge relies on coulomb counting and cedv for gauging accuracy

    thanks
    Onyx