• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 2 answers
  • Subscribers 63 subscribers
  • Views 790 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.

Chemical ID Selection Tool

Mihon Lipa
Intellectual 390 points
Other Parts Discussed in Thread: BQ40Z50
Hello.
Applied microcircuit: bq40z50-R2.
Pack configuration: 4 serial cells.
Tool: Gauging Parameter Calculator.
I did the test described in clause 3.1 SLVA725A – September 2015 – Revised August 2018 
"Simple Guide to Chemical ID Selection Tool (GPC) (Rev. A)", sent a log-file and received a report:

Best chemical ID: 100
Best chemical ID max. deviation,%: 3.64

I have several questions:

1. Is it possible to do the chemistry file detection test on a fully assembled battery or should 
it be done on only one separate cell?

2. Do I understand correctly that if the chemical ID = 100 is indicated in the report, 
then the chemistry file is not required to be flashed, since this number is the default 
number (SLUA384 – June 2006 "Support of Multiple Chemistries" Table 1-1)?

Fullscreen 2867.GPC_report.txt Download 
Chemistry ID selection tool, rev=2.5		
		
Configuration used in present fit:		
ProcessingType=2		
NumCellSeries=4		
ElapsedTimeColumn=0		
VoltageColumn=1		
CurrentColumn=2		
TemperatureColumn=3		
		
Best chemical ID : 100	Best chemical ID max. deviation, % : 3.64	
		
		
		
Summary of all IDs with max. DOD deviation below 3%		
		
Chem ID	max DOD error, %	Max R deviation, ratio
0	0	0
		
Warning: Deviation is above recommended level. New chem ID needs to be released for this cell. Please contact your TI representative to send the cell to Dallas for characterization		
		
		
Selection of best generic ID for ROM based devices like bq274xx		
		
		
Device / Family #1		
Generic Chem ID	Device/ Voltage/ Chemistry	max DOD error, %
312	bq27421-G1B: 4.3V LiCoO2	4.83
3142	bq27421-G1D: 4.4V LiCoO2	5.81
354	bq27411-G1C: 4.35V LiCoO2	6.4
128	bq27421-G1A: 4.2V LiCoO2	6.85
Best generic ID 312		
Max. deviations for best generic ID is within recommended range. Please chose this ID in your device configuration or device family.		
		
		
Device / Family #2		
Generic Chem ID	Device/ Voltage/ Chemistry	max DOD error, %
1202	bq27621: (default) 4.2V LiCoO2	6.23
354	bq27621:  (ALT_CHEM2) 4.35V LiCoO2	6.4
1210	bq27621:  (ALT_CHEM1) 4.3V LiCoO2	6.41
Best generic ID 1202		
Warning: Deviation for best generic ID is above recommended level for this device / family. Consider using another device, flash based gauge or RAM programming of custom ID.		
		
		
Device / Family #3		
Generic Chem ID	Device/ Voltage/ Chemistry	max DOD error, %
3142	bq27426: (ALT-CHEM2) 4.4V LiCoO2	5.81
1202	bq27426: (ALT_CHEM1) 4.2V LiCoO2	6.23
3230	bq27426: (default) 4.35V LiCoO2	8.14
Best generic ID 3142		
Warning: Deviation for best generic ID is above recommended level for this device / family. Consider using another device, flash based gauge or RAM programming of custom ID.

  • 0
    TI__Guru** 105740 points

    Hello Mihon,

    It is best to perform the relax-discharge-relax for the chemistry ID tool using only 1 cell to get the closest match, but you can submit it with a pack.

    The default chemistry for the bq40z50 is ID 1210, you can send the chemistry ID command to check it. You will need to program the chemistry ID into the gauge if the match is not ID 1210.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Intellectual 390 points


    I don't know the cell model, but I know that one cell has a capacity of 1.7 Ah.

    There are 29 chemistry files with number 100 in the list. Please tell me how I can choose a file.

    And what does it mean that chemistry ID do not support Turbo Mode 2?

  • 0 in reply to Mihon Lipa
    TI__Guru** 105740 points

    Hello Mihon,

    I'm not sure which chemistry files you are referencing, there should only be one matching ID. You can also use chemistry ID 312 as it has a similar match, I'm not aware of chemistry ID 100.

    Turbo mode requires more characterization during the chemistry ID generation process, Turbo mode is only for very specific applications so it is fine if it is not supported for your ID.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Intellectual 390 points 
    I mean these chemistry files with numbers 0100 ...
  • 0 in reply to Mihon Lipa
    TI__Guru** 105740 points

    Hello Mihon,

    Select the ID that matches the manufacturer and ID of your battery, sine these are all for the 18650 type cell. I will double check with someone on the team to see which one would be best.

    Sincerely,

    Wyatt Keller