BQ27542-G1: Golden image generation issue

Hi Andy,

How can we disable ?

I tried but not able to disable 

Please help here .

Thanks 

Vishal

Hi Team,

We ran the ChemID process on one more Setup and we were getting the ChemID 2076 with deviation is 5%.

We are running the learning cycle again with this chemID.

On the first discharge cycle, our RUP_DIS bit is high and the Vok bit is low which is not expected?

Do we need to start the Discharge cycle and once gauge has the OCV reading then automatic transition happens for RUP_DIS and Vok?

Can you please suggest ASAP?

Thanks

Saumil

I am attaching the snapshot here :

Initial discharge 

Let us know we are going right ?

Now update status is 04.

Please do needful.

Hi andy ,

Please find the log file and received report from GPCHEM.

3443.1A.zip

Chemistry ID selection tool, rev=2.49		
		
Configuration used in present fit:		
ProcessingType=2		
NumCellSeries=1		
ElapsedTimeColumn=0		
VoltageColumn=1		
CurrentColumn=2		
TemperatureColumn=3		
		
Best chemical ID : 2076	Best chemical ID max. deviation, % : 5.43	
		
		
		
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, %
128	bq27421-G1A: 4.2V LiCoO2	100.82
312	bq27421-G1B: 4.3V LiCoO2	111.07
354	bq27411-G1C: 4.35V LiCoO2	114.99
3142	bq27421-G1D: 4.4V LiCoO2	120.25
Best generic ID 128		
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, %
1202	bq27621: (default) 4.2V LiCoO2	100.68
1210	bq27621:  (ALT_CHEM1) 4.3V LiCoO2	106.59
354	bq27621:  (ALT_CHEM2) 4.35V LiCoO2	114.99
Best generic ID 1202		
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, %
1202	bq27426: (ALT_CHEM1) 4.2V LiCoO2	100.68
3230	bq27426: (default) 4.35V LiCoO2	114.95
3142	bq27426: (ALT-CHEM2) 4.4V LiCoO2	120.25
Best generic ID 1202		
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		
		
       0	0		
Warning: First OCVpoint has temperature outside of 45 to 10C range	 T=  -39.2		
Warning: First OCVpoint has temperature outside of 45 to 10C range	 T=  -39.1	0	

Hi andy,

Can you please update on the above issue ?

It would be really great to discuss over call instead of Wait and watch  on E2E .

Please lets know your availability?.

Please consider we are in critical situation  and seeking your support  and moving forward to production. 

Please do needful.

Hi Andy,

We started with the another learning cycle for the fuel gauge. After Initial Discharge and relax, we are observing that, during the first charging of the battery VOK bit is not getting set and RUP_DIS bit is not cleared in the charging cycle. Please find attached screenshots for this. Please let us know on this anamoly ASAP .

Regards,

Mahek Delawala

Hi Andy,

I need to add one more point in this charging cycle. When the battery is charging and it reached around 95 % , after sometime suddenly SLEEP bit was set and RUP_DIS bit was cleared, VOK bit is still low. Now it is taking zero current. Does this behaviour expected during the first charging cycle stage of Learning Cycle Process ? PFA screenshot for this. Let me know if you need more information.

Regards,

Mahek Delawala

Hi andy,

In Learning cycle following bits are not set :

FC  and VOK bit in charging cycle.

Update status is not moved further. Its 04 only even after second relax cycle.

I am attaching auto exported logs and let me know your input on this.

We will work on your time  and  I am requesting you to discuss over call.

Please understand the urgency.

Please do the needful. Auto_export.zip

Hi Kang,

TRM has been completely read by Vishal.

There are lot of confusions and questions.

This much small response will not help.

We seek the call where we can set every parameter correctly in front of you so learning cycle may proceed further.

We set the VCT based on our battery datasheet and voltage is 4200mV.

Let me know what exactly you want us to share so you can suggest all the parameters?

Do you want us to share the battery datasheet?

We need to clear out all the communication gap to resolve the issue.

Please do the needful.

Thanks

Saumil

Hi team,

can you please update me which chameid we can use ?

We got two came id:

2093 Best chemical ID max. deviation, % : 3.06   

 2076 Best chemical ID max. deviation, % : 5.43

Please do needful.

Thnaks 

vishal

Query list observed in last learning cycle

1. Following chemid we got :-

2093 Best chemical ID max. deviation, % : 3.06 (Spec:3050mAh )

2076 Best chemical ID max. deviation, % : 5.43 (Spec: 8448mAh)

please recomment, Which one we should use ?

2.Follwing value we have set
1.Design voltage -3700mV.
2. Design capacity-12000mAh.
3.Deisgn Energy-4440mWh.
4.Design Energy Scale-10.
5.Tapper current-400mA.
6.Charge current threshold-75mA.
7.Discharge current threshold-60mA.
8.Quite current-40mA.
9.Voltage at charge termination-4200mV.
10.Termination voltage-3100mV.
11.Charging voltage-4210mV.
Let me know any single parameter we missed or need to correct.

3.FC bit is not getting set after full charge.
4.Vok bit is not getting set at the start of the charge.
5. Update staus not increasing(moving)0x04 to 0x05
6.Please let us know when Vok bit will set/clear in entire learning cycle. If VOK not set while charging what is the impact on learning cycle?
7. Let us know when will RUP_DIS bit be Set and clear in the entire learning cycle?
8. In previous learning cycle battery voltage reach upto 3964mV even though battery charge termination is 4200mV

Please provide your Feedback.

The meeting minutes have already been sent out to you guys.