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BQ28Z610-R1: BQ28Z610-R1, low temperature operation inquiry

Grady Lee
Genius 3225 points
Part Number: BQ28Z610-R1
Other Parts Discussed in Thread: BQSTUDIO, GPCCHEM, GPCRB

Hi, TI expert.

Currently using BQ28Z610-R1, there is a problem in Low temperature operation test. Please check the attached video.

After fully charging the battery, leaving it in a low temperature chamber at -20 degrees for 6 hours and then operating at room temperature, the battery voltage is 3290mV, but the SOC is 100%.

It appears that the SOC algorithm for battery voltage does not operate properly.

Looking at other vendors' fuel gauges, it is known that they apply compensation algorithms for low-temperature operation or set specific registers to enable compensation for low-temperature performance.

Does the BQ28Z610-R1 also have registers, algorithms, or learning methods related to low-temperature operation compensation?

Please check. Thank you.

  • +1
    TI__Mastermind 24886 points

    Hello,

    All impedance track gauges must use the GPCRB tool for low temperature compensation after properly matching your battery cell with one of our ChemID listed. 

    Please use the tool to tune the internal resistance for low temperatures along with other temperature parameters. Instructions are listed in the shared link above. 

    Regards,
    Jose Couso

  • 0
    Prodigy 80 points

    Dear Jose Couso

    We tested after applying low temperature data, but RSOC Jumped 100% to 0% in sleep mode at -20 degree chamber.

    We updated Ra Table and chemistry ID suggested. What do we have to check?

  • 0 in reply to SEONGMIN KANG
    TI__Mastermind 24886 points

    Hello,

    It looks like the Ra Table was updated, but the Rb table was not. 

    Did you follow all instructions in the GPC report? Did you program the given ChemDat file using BQStudio? 

    Please share the following using BQStudio:

    1- export the srec file
    2- please share the GPC report



    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    Prodigy 80 points

    /cfs-file/__key/communityserver-discussions-components-files/196/3175.2610_5F00_1_5F00_01_2D00_bq28z610R1.zip

    /cfs-file/__key/communityserver-discussions-components-files/196/GPC_2D00_report.zip

    Here are our GPC-report and srec file.

    In bqstudio data memory, we can see Ra Table only. Rb Table is not found. Where can we apply Rb table in bqstudio?

    After checking our files, please reply it

    Thanks

  • 0 in reply to SEONGMIN KANG
    TI__Mastermind 24886 points

    Hello,

    I have created a new srec with the GPC report data. Please run the test and log using BQStudio. 

    If the issues persists, please share the log file from BQStudio.

    new_srec.srec

    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    Prodigy 80 points

    Hello

    We tested battery with srec file you gave us, but Symptoms do not improve. Are there any other points to review?

  • 0 in reply to SEONGMIN KANG
    TI__Mastermind 24886 points

    Hello,

    Please share a log file.

    Did you find a good matching ID? If so, please share the GPCCHEM report.

    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    Prodigy 80 points

    Hello
    5824.GPCPackaged.zip

    5824.GPC_report.txt 
    Chemistry ID selection tool, rev=2.54		
		
Configuration used in present fit:		
ProcessingType=2		
NumCellSeries=1		
ElapsedTimeColumn=0		
VoltageColumn=1		
TemperatureColumn=2		
CurrentColumn=3		
		
Best chemical ID : 5762	Best chemical ID max. deviation, % : 1.38	
		
		
		
Summary of all IDs with max. DOD deviation below 3%		
		
Chem ID	max DOD error, %	Max R deviation, ratio
5762	1.38	0.17
5125	1.39	0.29
5331	1.46	0.19
5217	1.53	0.11
5830	1.57	0.19
5340	1.57	0.18
5599	1.6	0.2
7042	1.63	0.17
2543	1.66	0.17
5325	1.67	0.21
5231	1.71	0.2
5974	1.73	0.33
5127	1.73	0.21
5907	1.75	0.19
7070	1.77	0.21
5870	1.77	0.23
5358	1.82	0.21
7083	1.82	0.19
574	1.85	0.21
5420	1.86	0.12
2253	1.87	0.18
5815	1.89	0.22
5771	1.9	0.22
5458	1.9	0.24
7156	1.9	0.21
2573	1.9	0.21
2532	1.91	0.23
5521	1.91	0.29
2976	1.94	0.19
5967	1.94	0.26
5124	1.94	0.17
5567	1.94	0.25
5540	1.95	0.16
5509	1.95	0.24
5492	1.95	0.35
5835	1.96	0.33
2693	1.97	0.26
5139	2	0.23
5786	2.01	0.31
5928	2.01	0.31
5519	2.01	0.25
5916	2.02	0.27
5756	2.03	0.18
7159	2.03	0.27
5361	2.03	0.25
5950	2.05	0.25
5439	2.05	0.25
5266	2.06	0.23
5250	2.06	0.29
5510	2.07	0.2
7048	2.08	0.21
5748	2.08	0.23
2866	2.08	0.25
5814	2.08	0.24
5386	2.08	0.19
2528	2.1	0.19
1468	2.1	0.23
2506	2.1	0.21
5966	2.1	0.26
2329	2.11	0.18
2773	2.12	0.23
5812	2.12	0.25
2492	2.12	0.27
5158	2.15	0.27
7008	2.16	0.17
5198	2.16	0.24
540	2.16	0.29
5913	2.17	0.21
5356	2.17	0.26
5560	2.17	0.25
5293	2.18	0.13
5552	2.21	0.23
5807	2.22	0.31
2956	2.22	0.17
5661	2.23	0.24
5831	2.23	0.26
2686	2.24	0.26
5304	2.24	0.14
2271	2.24	0.24
5549	2.24	0.15
5537	2.24	0.15
5888	2.25	0.28
2928	2.25	0.28
2785	2.25	0.29
2780	2.26	0.28
5983	2.27	0.25
5908	2.27	0.22
5523	2.27	0.23
5664	2.28	0.26
2911	2.28	0.27
5464	2.3	0.29
7139	2.3	0.22
5672	2.31	0.18
5163	2.31	0.27
5333	2.32	0.29
5796	2.32	0.28
5806	2.33	0.23
7050	2.33	0.3
7060	2.33	0.3
5494	2.34	0.29
5740	2.35	0.25
5157	2.35	0.3
5243	2.35	0.26
5954	2.35	0.24
5262	2.36	0.34
2198	2.38	0.17
2717	2.39	0.31
7009	2.39	0.26
5573	2.4	0.3
7158	2.4	0.29
2546	2.41	0.31
5557	2.42	0.12
5551	2.42	0.3
2604	2.43	0.29
3142	2.44	0.15
2907	2.44	0.34
2243	2.46	0.13
2618	2.47	0.3
5478	2.47	0.29
5324	2.48	0.24
2838	2.49	0.3
7105	2.5	0.27
2181	2.5	0.2
7044	2.5	0.32
2927	2.52	0.31
554	2.53	0.18
2774	2.53	0.33
517	2.54	0.31
5123	2.55	0.32
7045	2.55	0.29
5999	2.56	0.31
5990	2.57	0.26
5561	2.57	0.31
5332	2.59	0.33
5899	2.59	0.3
5321	2.6	0.24
558	2.6	0.32
5357	2.61	0.32
2674	2.61	0.31
5970	2.61	0.31
2270	2.62	0.31
5490	2.62	0.33
5334	2.62	0.3
596	2.63	0.27
5843	2.63	0.28
5229	2.64	0.3
5949	2.65	0.29
2470	2.65	0.34
2828	2.66	0.23
5115	2.66	0.18
5546	2.67	0.31
2823	2.67	0.34
2831	2.67	0.25
2873	2.67	0.32
5136	2.69	0.28
5824	2.69	0.33
5872	2.69	0.22
5719	2.7	0.22
2665	2.71	0.36
5360	2.72	0.37
7007	2.73	0.23
5216	2.74	0.29
5816	2.76	0.2
5935	2.77	0.32
5957	2.79	0.38
7100	2.79	0.34
5825	2.79	0.29
5654	2.8	0.31
577	2.8	0.37
5723	2.82	0.22
5894	2.82	0.25
5545	2.82	0.3
7027	2.82	0.34
2712	2.83	0.24
537	2.83	0.23
5788	2.84	0.36
2999	2.86	0.36
2914	2.87	0.36
2889	2.87	0.34
2948	2.89	0.14
587	2.89	0.35
5372	2.89	0.39
5855	2.89	0.2
7056	2.89	0.22
5488	2.9	0.21
2786	2.9	0.35
5109	2.9	0.24
5722	2.9	0.35
5923	2.9	0.28
7015	2.91	0.24
5953	2.91	0.21
7123	2.92	0.22
5821	2.94	0.35
2614	2.96	0.25
7004	2.97	0.33
5258	2.97	0.28
7136	2.97	0.32
5259	2.99	0.23
7120	2.99	0.22
2942	3	0.3
		
Max. deviations for best ID is within recommended range. Chosen best chemical ID is suitable for programming the gauge.		
		
		
Selection of best generic ID for ROM based devices like bq274xx		
		
		
Device / Family #1		
Generic Chem ID	Device/ Voltage/ Chemistry	max DOD error, %
3142	bq27421-G1D: 4.4V LiCoO2	2.44
354	bq27411-G1C: 4.35V LiCoO2	5.88
312	bq27421-G1B: 4.3V LiCoO2	13.2
128	bq27421-G1A: 4.2V LiCoO2	17.04
Best generic ID 3142		
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, %
354	bq27621:  (ALT_CHEM2) 4.35V LiCoO2	5.88
1210	bq27621:  (ALT_CHEM1) 4.3V LiCoO2	8.61
1202	bq27621: (default) 4.2V LiCoO2	14.15
Best generic ID 354		
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	2.44
3230	bq27426: (default) 4.35V LiCoO2	5.5
1202	bq27426: (ALT_CHEM1) 4.2V LiCoO2	14.15
Best generic ID 3142		
Max. deviations for best generic ID is within recommended range. Please chose this ID in your device configuration or device family.

    These are our GPCCHEM report and raw data. When i get a chemID, is low temperature data needed?

    And is any way to prevent RSOC JUMP to 0% by a certain resister when discharging in low temperature?

    Thanks

  • 0 in reply to SEONGMIN KANG
    TI__Mastermind 24886 points

    Hello,

    Yes, low temp optimization is needed after finding a good match.

    Can you please share a log file? I can help debug and provide possible solutions with a BQStudio log file. 

    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    Prodigy 80 points

    lowtemp_new_srec_0C2_Loadtest_20231222.log

    Hello

    We attached log file. Please check it.

    This fuel gauge is programmed by srec you gave us.

    We loaded 0.2C(980mA) in -20 degree. It was terminated at 2800mV(fuel gauge's CUV)

    But still RSOC was not changed from 100%.

    We will test and attach a log file at -10 degree again.

    Thanks

  • 0 in reply to SEONGMIN KANG
    TI__Guru** 103165 points

    Hello,

    Our responses will be delayed due to US holidays, sorry for the delay.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 80 points

    Hello

    We found what effect to soc. At low temperature, fuel gauge can't not remaining capacity  and full capacity value.

    Do you know what causes this phenomenon to occur in a low-temperature environment?

  • 0 in reply to Wyatt Keller
    Prodigy 80 points

    Hello,

    When we can get reply? please check a schedule. Thanks

  • 0 in reply to SEONGMIN KANG
    TI__Guru** 103165 points

    Hello,

    Jose is still out in the holiday.

    Generally when FCC reports 0mAh at low temperature this indicates the temperature compensation is not completed (GPCRB) and the gauge is estimating that the resistance is so high, when the load select is applied during an FCC simulation the voltage immediately hits terminate voltage.

    Sincerely,

    Wyatt Keller