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TINA/Spice/BQ27542-G1: bq27542-g1

amarendar deshimi99
Prodigy 250 points
Part Number: BQ27542-G1
Other Parts Discussed in Thread: TINA-TI, BQ27541-G1, GPCCHEM, BQSTUDIO, BQ25606

Tool/software: TINA-TI or Spice Models

Hi

We are planning to use BQ27542-g1 for our POS design. Our  battery specs as below. Please confirm the following queries.

1. Can we use 2 cells 3.7V/2600mAh (2P) (3.7V/5200mAh) battery.

2. We have got the CHEMID of our battery is 1280 with BQ27411-G1A.  Can we use same CHEMID with BQ27542 IC or again CHEMID generation is required.

3.  BQ27542-g1 ----this is one time programmable or can we re-program multiple times.

4. Please send the android (Qualcomm platform) drivers for BQ27541-G1

  • 0
    TI__Mastermind 42535 points
    your question will be answered here over the weekday.
  • 0 in reply to Batt
    TI__Guru* 76230 points
    1. yes. You just need to program the correct chem id and the design capacity which will be 5200mAh and the gauge will learn the resistance and qmax of the pack.
    2. chem id 1280 is the hard coded chem id in the bq27411. There may be a more closely matched chem id so you need to either check the gpcchem report you got earlier to see what chem id showed as the best match or if you don't have that report then you need to rerun a new chem id. i would not recommend using the 1280 as that might not be the best match.
    3. You can program multiple times.
    4. what we have is below. We do not have specific android drivers for this device.

    www.ti.com/.../slua543.pdf
    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 250 points

    4426.bq27542.zipHi Onyx,

    We are using 3.7V/5200mAh Battery. We have characterized our battery and we have got the CHEM ID is 2089 and DOD error is 1.48%. We have write the CHEM ID by using BQStudio with EV2300 programmer.

    Now we are getting issue with SOC. For example my battery voltage is 3.8V and i am trying to charge the battery with BQ25606. Charge and Discharge percentage is gradually increasing and decreasing. But SOC is not matching to battery voltage. Example.

    Battery voltage is 3.8V ..the SOC is increasing so fast(up to 99%(1%..2%...3%...etc)) as voltage level of my battery is still 3.9V.  when battery voltage reaches to 4.2V(Fully charged)..SOC is 100%.

    The same scenario appears in Discharge mode also.

    Note: We have characterized our battery cells two to three times..We have got different CHEM ID's each time. Why,(Is it depends on temp.)

    CHEM ID's are 2009, 1280 and 2023.

    Even we tried with above all CHEMID's the SOC error is there as mentioned above.

    Here i am enclosed GPC report of 2089 CHEMID..please go through it and  advise further.

  • 0 in reply to amarendar deshimi99
    TI__Guru* 76230 points
    hi Amarendar,

    After getting the chem id, you still need to perform a learning cycle so qmax and ra tables updates. Only then will you achieve good accuracy with the gauge

    Do you know how to perform a learning cycle?

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 250 points

    Hi Onyx,

     Yes. It is   dis---rel---dis   correct...

    Could you please tell me why CHEMID's are getting different each time.

  • 0 in reply to amarendar deshimi99
    TI__Guru* 76230 points

    Hi Amarender

    No, pls see attached document for the procedure to perform a learning cycle. We also have a video

    1220.LearningCycleOverview_.pdf

    As long as the results returned are have max dod error less than 3%, you can use any one you want. Are you saying you are submitting the same files each time and getting different results? it is a mathematical comparison against our data base so if you submit different files containing different data such as different discharge rates you could get different results

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Prodigy 250 points

    Hi Onyx,

     Thank you.

    Now we will perform learning cycle and get back to you.

    For different  CHEMID we are sending different data each time.

    For further support i will get back to you.