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BQ34Z100-G1: During Learning Cycle Communication to PC via E2400 is breakdown

SoonuVerma
Prodigy 180 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQSTUDIO, , EV2400, GPCCHEM

Hi, 
During the learning process of BQ34z100-G1, EV2400 connection to DashBoard(BQstudio) is lost, without any physical touch to USB.
so I plug out and plugin the USB to PC, it restores the connection but few "register bits"  on dashboard screen went colourless(black) and values of registers are not updated,
Screenshot attached
I didn't tried to restart the GUI as data logging is in the process?

So,
1. Here I would like to know why this connection loss held, any specific reason, as I have faced the same situation several times?
2. what should I have to do in such a scenario?
3. How to avoid this... and how it will affect the leaning cycle process as few registers on the dashboard went black as don't know they are high or low?


Regards:
Soonu Verma

  • 0
    TI__Mastermind 42535 points

    Hi Sonu,

    You will lose power to the evm if it goes into shutdown. Other than that you are not supposed to lose power to the evm. You need to make sure that the evm is powered up correctly. Then make sure that the registers are red or green and not grey except for the rsvd bits. With bqstudio you are really not supposed to see these issues.

    Please check if the load is very high and drains your battery below 2.2V, that can cause the evm to shutdown.

  • 0 in reply to Batt
    Prodigy 180 points

    Hi Batt,

    Thanks for the kind reply,

    Using 18Ah LiFIPO4 Battery with Nominal Voltage 25.6v.
    Charging it with 5-6 Amp, 28.8v (CC, CV mode)
    Discharging with 5 Amp, till 21v only


    what should I have to do to avoid this EVM shutdown (things to be taken care of)?
    last time I have faced this thing while I'm replacing "Charger with DC Load" for discharging the battery, whereas battery connection is untouched
    maybe high potential making any difference this scene happens?
    and should repeat the whole process if faced such a situation means all past steps are waste at that moment or can be resolved by any other process?

    Regards
    Soonu Verma

  • 0 in reply to SoonuVerma
    TI__Mastermind 42535 points

    Hi Soonu,

    Just make sure that your BAT voltage doesn't drop below the shutdown voltage. With your system, the gauge shouldn't really be entering shutdown. Make sure that your jumpers are set appropriately. Please follow the quickstart http://www.ti.com/lit/ug/sluubv2/sluubv2.pdf and the evm guide http://www.ti.com/lit/ug/sluu904a/sluu904a.pdf.

  • 0 in reply to Batt
    Prodigy 180 points

    Hi Batt,

    First of all thanks for the kind support.

    I would like to ask two things here,
    1) I feel whenever I switched off the charger or the DC load on completion of charging/discharging cycle. some spikes or change of impedance or kind of switch debouncing may affecting the system even data log stops at that time, whereas on the right corner of GUI says data logging is On, but no data used to get recorded after that period.

    is there any recommended procedure for avoiding this?

    2) I have generated the chemistry ID through  GPCChem tools, attaching a file, it says the best matching profile is 6106 which is assigned to 15000mAh NIMH battery.
    whereas mine is 18000mAh LifePO4 battery?
    what to do here

    GPCChem Report:

    Chemistry ID selection tool, rev=2.48		
		
Configuration used in present fit:		
ProcessingType = 2		
NumCellSeries = 8		
ElapsedTimeColumn = 0		
VoltageColumn = 1		
CurrentColumn = 2		
TemperatureColumn=3		
		
Best chemical ID : 6106	Best chemical ID max. deviation, % : 13.96	
		
		
		
Summary of all IDs with max. DOD deviation below 15%		
		
Chem ID	max DOD error, %	Max R deviation, ratio
6106	13.96	0.73
		
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, %
354	bq27411-G1C: 4.35V LiCoO2	30.58
3142	bq27421-G1D: 4.4V LiCoO2	36.65
128	bq27421-G1A: 4.2V LiCoO2	4539.79
312	bq27421-G1B: 4.3V LiCoO2	15752.47
Best generic ID 354		
Warning: Generic ID Deviation is so high that it is most likely due to anomaly in the data. Please check that data files have recomended format, units and test schedule		
		
		
Device / Family #2		
Generic Chem ID	Device/ Voltage/ Chemistry	max DOD error, %
354	bq27621:  (ALT_CHEM2) 4.35V LiCoO2	30.58
1210	bq27621:  (ALT_CHEM1) 4.3V LiCoO2	34.15
1202	bq27621: (default) 4.2V LiCoO2	4704.25
Best generic ID 354		
Warning: Generic ID Deviation is so high that it is most likely due to anomaly in the data. Please check that data files have recomended format, units and test schedule		
		
		
Device / Family #3		
Generic Chem ID	Device/ Voltage/ Chemistry	max DOD error, %
3230	bq27426: (default) 4.35V LiCoO2	28.39
3142	bq27426: (ALT-CHEM2) 4.4V LiCoO2	36.65
1202	bq27426: (ALT_CHEM1) 4.2V LiCoO2	4704.25
Best generic ID 3230		
Warning: Generic ID Deviation is so high that it is most likely due to anomaly in the data. Please check that data files have recomended format, units and test schedule

    Regards:
    Soonu Verma

  • 0 in reply to SoonuVerma
    TI__Mastermind 42535 points

    Hi Soonu,

    The system debounce shouldn't really affect shutdown because at the point where the source turns off you are just dropping to the natural pack voltage.

    The chem ID looks OK and the match is acceptable for an NiMH battery.