Part Number:BQ28Z610
We have been building battery packs in production for over a year now. Our Production Test System has been recording the hardware revision from the bq28z610 chip using command 0003. It used to report 06. The latest reel of parts we received are reporting 02.
Can you tell me where I can find a list of the changes between these revisions? Or more importantly, will any of these changes make any difference to me on how the part operates?
Thanks
Kevin
Part Number:BQ27750
Hello,
My company has recently designed a pack using the bq27750– we are very happy with the gauge and our customer (medical device company) is quite satisfied with our first prototypes. However, in the design process, I found some register inconsistencies between the bq27750 and its technical reference manual.
For context:
BQ27750
a. DeviceNumber: 0x1750
b. HW_Version: 0xA2
c. FW_Version: 0x0004
d. FW_Build: 0x000c
Using Battery Management Studio Test Build 1.3.80 and the bq27750 Technical Reference Manual released on 4 Aug 2017.
The short question: Can TI provide an updated version of the bq27750 technical reference manual?
What follows is a series of questions, by register, regarding bits found in the gauge but not included in the technical reference manual section 12.3.1. The function of some of these bits can be guessed from their name but, for knowledge sake and to best serve our customer, I would like to know TI’s intent rather than guess.
DA Config
Could TI please elaborate on the function of EMSHUT_PEXIT_DIS?
Power Config
The TRM only describes Auto_Ship_EN in this register, could TI please elaborate on the function of the rest of the bits?
IT Gauging Config
Fuel gauge bits in question are Imaxresrven, fast_qmax_fld and relax_smooth_ok
Registers found in the gauge but not described in the TRM:
The following registers are also listed in TRM table 13-1 but not described in section 12.3.1. Could TI please provide detail for:
Thank you for your time, I look forward to using this chip in future projects!
Best regards,
Andrew
Part Number:BQ35100
Hello,
I want to use the BQ35100 with primary cells from ELECTROCHEM. Specifically the "CSC93 SERIES: 3B0024" (see attached datasheet). The battery is not listed in the "Battery Chemistry List". What will be closet battery chemistry i can select from the available list ?
Note : I already have downloaded the latest "Battery Chemistry" list (635) (Please visit the site to view this file)
Part Number:BQ27742-G1
I am using Battery Management Studio version 1.3.80 to configure a prototype battery pack, which includes a BQ24421-G1. I programmed a proper ChemId, I calibrated it and run a learning cycle successfully. I created a "Golden Image" and got 3 files:
Which file shall I use during production of our battery packs? Is it sufficient to use the small .df.fs file? Or do I need to program the larger bq.fs file?
I am asking because it takes a significant amount of time to transfer 180 kByte to our microcontroller. 7 kByte would be much faster. What is the difference between these files? Something is missing in the smaller file, but I do not understand what is missing.
Part Number:BQ28Z610
Hello,
I am testing a 2-cell battery with bq28z610 and Sony US18650VTC6. Chemistry update and learning cycle were done. However, the application current is much higher than the current used during the learning cycle (10A vs 0.6A) and I am seeing a huge error in RSoC, something like 15-20%. I have done controlled discharge with different currents and the maximum error is acceptable at 1A - about 2.5%, at 5A it becomes 8% and at 10A it is 16%. I have noticed a trend that the gradient of the Remaining Capacity curve is always 'pessimistic', i.e. it reduces faster than it should and at the very end (below 10% RSoC) it starts compensating but by that time the huge error has already developed.
Attached are the graphs of the RSoC error and the GG Remaining Capacity vs the calculated one. (Calculations as per the TI E2E™ Community guide How accurate is your battery fuel gauge?)
I am stuck with this problem and I am incline to think that the issue is somehow higher impedance included in the GG algorithm, but have no idea where to look and correct it
Regards,
Peter M
Part Number:BQ27750
Hello TI team,
regarding BQ27750, do you have any written C code libraries that I can implement/use to my MCU (MSP430) to read out data from fuel gauge registers?
I do not want to write it from scratch. I believe it has to exist already somewhere :)
I could not find anything on TI websites.
Thank you in advance.
BR,
Daniel
Part Number:BQ78350
In my program, I want to use ManufacturerAccess() or ManufacturerBlockAccess() comand to read OperationStatus() .
What is the command sequence?
Should I fisrt send a IIC write conmand writing three bytes,0x44, 0x54 ,0x00 to bq78350
and then start a new command to read six bytes from bq78530?
I tried many different command sequences , but I didn't get the right data.
Part Number:BQ34Z100-G1
Good morning,
after completing the learning cycle accordingly to SLUA597, it is not clear how to create a golden file ready to be used in production.
In SLUA334B it seems the "Update Status" parameter must be manually changed from 06 to 02. In SLUA664 (referred to BQ34Z100 instead of BQ34Z100-G1), I can read: "When the golden DFI file is created by bqEASY, bit 2 will be cleared, leaving Update Status=0x02. Note that none of these bits should be manually changed."
So I don't know if and how to change the Update Status from 06 value (at the end of the learning cycle) to 02 (value suitable for production programming of the BQ34Z100-G1).
Is there any detailed procedure description for extracting the golden file at the end of the learning cycle by using the BQ Studio software?
Thank you and best regards
Matteo
Part Number:BQ34Z100-G1
Good morning,
I'm going to use the BQ34Z100-G1 in "10-LED Expander with I2C Host Comm" mode. In such a mode the BQ34Z100-G1 sends LEDs status through a bitbanged approach with RC2 as Clock and RC0 as Data.
Is it possible to have some more information about timing of those RC0 and RC2 signals?
Is that bit streaming triggered only by a short circuit between REG25 and VEN pins or there is any way for having a continuous automatic repetition of such a streaming?
Thank you and best regards
Matteo
Part Number:BQ40Z50-R1
Hi ,
If TS2/TS3 are unused can I direct short this pin to vss or left this pin floating?
Thanks
Part Number:BQ27530-G1
Dear team,
We'd like to use the bq27530-G1 and bq24161 chipset for battery charging and monitoring in one of our products. But from datasheets I was unable to determine whether this solution provides general cell over temperature protection by disconnecting the battery from the rest of the system (no external FET for the bq24161 and supplying the bq27530 from pack). Could you please clarify this issue?
Thanks for your help,
Kind regards,
Customer
Part Number:BQ28Z610
Hello,
following the procedure in a post above, I have done the folowing to prepare the golden file:
You can now create the golden pack.
Then, I upload the golden.srec into the BQ28Z610 installed in the new boards, test the boards and then we attach the cell and put into final enclosure.
We use the calibration data of the golden file, knowing they are not accurate like a calibration of each BQ, but it should be enough accurate for our scope.
What is the correct procedure after that? Is it necessary a further learning cycle or what kind of cycle has to be done to assure the FFC is in line with the real Capacity?
I supposed that discharge to empty and then charge to full would update the FCC at rated capacity, at least, but it is not so, only few batteries show FCC = or > than Desing capacity.
Thanks for your sugggestions ..
Maurizio
Part Number:BQ40Z50-R2
Hi,
I know that bq40z50-R2 can support zero volt charging, but now the customer would like to disable zero volt charging. It means that they would not like to allow charging for the battery that has battery voltage below 1.1V. So please let me know if you have any option to disable zero-volt charging function.
Best Regards,
Satoshi / Japan Disty
Dear, we use the BQ27742-G1 and I have with serveral BQ chips in our hardware problems to connect via I2C. We use the EV2400 and can not connect to the BQ chip. The BQ didn't send an ACK when the Barrery Management Studio try to connect. Is there any procedure which I have to execute to activate the I2C bus? Best Regards
Part Number:BQ40Z50-R1
I use RL78-MCU to communicate with the PCB board on which BQ40Z50-R1 is mounted, but some boards always return incorrect data.
Even if bqStudio is started, "Target Selection Wizard" is displayed on board which returns incorrect data and it is not recognized automatically.If you try with a normal board, the BQ40Z50-R1 will be recognized automatically.
The cell is not connected and voltage is applied to the PACK terminal side.
We know that it is possible to communicate properly by replacing the BQ40Z50-R1, so we suspect a device failure.
I upload communication contents when bqStudio starts up.
Do you know the cause?
Thanks.
normal
| Bus Definition: I2C | |||||
| Time | Repeat Start | Direction | Address | Data | Missing Ack |
| 1.39E-17 | Write | 16 | 22 3E | X | |
| 2.60E-02 | Write | 16 | 20 3E | X | |
| 5.10E-02 | Write | 16 | 22 3E | X | |
| 1.83E-01 | Write | 16 | 2F | ||
| 1.84E-01 | X | Read | 17 | 0B 45 00 01 06 00 24 00 03 85 02 00 D0 |
error
| Bus Definition: I2C | |||||
| Time | Repeat Start | Direction | Address | Data | Missing Ack |
| 1.39E-17 | Write | 16 | 22 3E 00 00 | X | |
| 2.60E-02 | Write | 16 | 20 3E | X | |
| 5.20E-02 | Write | 16 | 22 3E 00 00 | X | |
| 1.74E-01 | Write | 16 | 2F | X | |
| 1.84E-01 | Write | 16 | 00 01 00 06 | ||
| 2.05E-01 | Write | 16 | 0 | ||
| 2.06E-01 | X | Read | 17 | 17 17 17 | |
| 2.14E-01 | Write | 16 | 00 02 00 39 | ||
| 2.36E-01 | Write | 16 | 0 | ||
| 2.37E-01 | X | Read | 17 | 17 17 17 | |
| 2.45E-01 | Write | 16 | 00 00 00 13 |
Part Number:BQ27441-G1
Can you help me complete bq27441 calibration process?I don,t find the explain in user's guide. Maybe you can give me a document about bq 27441 calibration process.Thank you.
Part Number:BQ78350
I configured the bq78530 as follows:
AFE Cell Map :0x1F (My pack has five Li-ion cells)
Design Capacity mAh :11000
Design Capacity cAh: :4070
Design Voltage :3700
Learn Full Charged Capacity :11000.
I applied 1.6A load to bq78350.
After a period of time, the remaining capacity suddenly drops form 75% to 7%.
And I charged the cells to 21V, the remaining capacity is only 16%.
I think the capacity should derement two in about 1 second. But the remaining capacity decrement one in about two seconds.
I seems the gauge don't cares about cell numbers. Does Design Capacity mean a single-cell capacity?
I don't konw why does the problem happen.
Part Number:BQ34Z100-G1
Hello,
I use a BQ34Z100-G1. I would like to know how takes place the learning of the gauge? is it update the table Ra with regard to the current cycle or with regard to all the cycles seen by the battery?
I have a battery which undergoes a sequence cycle, will the table Ra be optimized at the end of the cyle?
The sequence is for all power (350W, 550W, 150W, 450W, 250W 350W) with many test of ambiante temperate for each power (the temperature is in the order that the cycle is realized : -30°C with 1h of heater, -30°C without heater, 20°C, -15°C with 1/2h of heater, 55°C, -15°C without heater, 0°C)
When I compare the sequence at 350W -15°C without heater, with the sequence at 550W -15°C without heater, the test for 550W is bad for the remaining power. Can you give a explain for that? I join the result of the test and the *.gg.csv that I implement into the gauge.
Best Regards,
L.MICOU
(Please visit the site to view this file)