Battery Management

Forum Post: RE: How to turn off OVER LOAD function about bq29312a?

KIM DOSOEK — Wed, 22 May 2013 04:01:00 GMT

Thank you for Reply Tom.

I replaced sense resistor from 5mohm to 3mohm but the problem has not been solved.

The bq2084evsw did not recognized when I made a current calibration after changing sense resistor.

The bq2084evsw did not recognized less than 5mohm sense resistor value when making a calibration.

Regards

KIM

Forum Post: RE: bqEASY Impedance Track Algorithm

Onyx Ahiakwo — Tue, 21 May 2013 21:02:00 GMT

Dylan,

You shouldn't be applying a load as this will cause further discharge below your cell undervoltage threshold (CUV) and cause the XDSG bit to get set if the CUV threshold condition doesn't clear within the default 2 second timer window. You will need to program your data flash appropriately before carrying out the learning process. The technical reference manual of the device you are using explains what all the data flash parameters mean. You need to understand them to be able to program your device appropriately as needed by your application.

Onyx

Forum Post: RE: UC2906 charger issue

greenja — Tue, 21 May 2013 20:13:00 GMT

If your calculations seem correct, then you should follow my previous recommendation and use a potentiometer to tweak the design. Perhaps the resistor values are not at the tolerance you think they are.

I do not know for certain about the live connections. I would think though that since the charger first monitors the state of the battery before ramping up the current that this should not be an issue. You only issue would be if the battery polarity was reversed.

Thanks,

Forum Post: RE: Unable to calibrate BQ78PL116 on one board

greenja — Tue, 21 May 2013 20:06:00 GMT

Hello Max,

From my limited experience with these things, I would have to say that there is a hardware problem on the 4th board. The software is doesn't know what board you have connected, it only bases its calculations on the values it reads from the chip. If the other 3 boards work correctly and there is an error on the 4th, it does seem to point to hardware. Check your grounding, filter caps and inputs again. Perhaps put a scope on the inputs to see what is going on.

Thanks,

Forum Post: RE: bq30z50 / bq30z55 and Evaluation Software

Chao Wahng — Tue, 21 May 2013 17:53:00 GMT

Hi Tom,

I'm new to this terminology, what is CEDV and what is the difference between that and a z series IC?

Thanks,
Billy

Forum Post: BQ20z75, CHG and PCHG FET are off

Ramiro Ibanez — Tue, 21 May 2013 17:50:00 GMT

One of our products contains a 4-cell-in-serie battery pack including a BQ20z75 + TI suggested FET protection circuitry.

The BQ20z75 is configured to make the pack acts as non-removable. The Design capacity is 680mA, 4 batcells LION 3,6V in serie.

The modules are allways tested before shipment (Impedance Track is allways enabled), and some of them are already more than a year running properly. All of them have the same Data Flash image and initialisation procedure

In some cases, after some time, and under unknown conditions the Charge FETs are OFF and don't allow the battery cells to be charged, it happens on both Charge and pre-charge FETs. During this state, the battery cells are within valid ranges and there is no over temperature, over voltage, permanent failure or whatsoever flag. BQ20z75 informs that the Charge FET's should be conducting but they are not, there is no current flow reported by BQ20z75 at all.

The problem has sporadically (not allways working method) disappeared if a reset order 0x0041 is sent to the BQ20z75, or if the cells are discharged until under voltage condition, or if the FETs are turn OFF and ON manually using I2C commands.

The Discharge FET has been never a problem, as soon as the battery cells where over the programmed threshold, the Discharge FET has allways worked.

We have searched in TI gas gauge support forum for a similar case and we found this one: "BQ3060 - Strange state with no errors but FETs off" which is not really solved. Have you got more experience on such ERROR state?

looking forward your response

ramiro

PS: We have also seen that many users work with BQEASY and use the log files and reports from such Software as info to help you to find out the causes of the problem. When our battery pack enters this error state, we received the system from our customer and have no chance use BQEASY software. Would be the Data flash raw data as useful as BQEASY log files are?

Forum Post: BQ24650 Input Diode Drop Resulting in USB charging not meeting 5V Vcc_op minimum spec?

Dave Young — Tue, 21 May 2013 16:14:00 GMT

Hi-

I'm working with the BQ24650, and I would like to accept a charge from a 5V USB source to charge a single cell LiIon battery. However when looking at the typical application on page 2 of the datasheet, I see that there is an input diode, 'D1'. I also notice that the Vcc_op spec is 5V (datasheet pg 4).

If I'm trying to use the BQ24650 to charge a battery from 5V USB, the diode drop will bring the Vcc pin below it's minimum of 5V, especially under high charge currents.

Is this diode necessary? Can I remove it to save the diode drop to better meet the Vcc_op spec? What would be the trade off of doing this?

Thanks!

Forum Post: Stacking single cell chargers

Edward Soon — Tue, 21 May 2013 15:54:00 GMT

i was wondering if the single cell chargers can be stacked in series to charge LIPO packs.

BQ24250

the reason I am asking is that the source voltage is 5v and i need to charge a 3s stack of LIPO.

Forum Post: RE: bq78PL114 and LiFePO4

Allen Y Chen — Tue, 21 May 2013 15:05:00 GMT

Hi Robert, Wim,

Please get in touch offline at a-chen@ti.com and we can discuss if -R1 may be suitable for your specific application(s).

Thanks,

Allen

Forum Post: RE: BQ24061 application question

Tahar Allag — Tue, 21 May 2013 14:11:00 GMT

Hi Chen,

The STAT1 and STAT2 indicate that the battery is charged and the charge is terminated.

What do you mean by no put battery? Is the battery connected to the BAT terminals of the EVM? What is the voltage on BAT+ of the EVM? Make sure nothing is connected to the BAT terminals of the EVM.

If the battery removed, you should see the Battery-Absent Detection Waveforms of figure 23 in the ds.

Thanks!

Tahar

Forum Post: RE: Generating and using .bqfs and .dffs files for BQ27410 fuel gauge

Kishan Illur — Tue, 21 May 2013 14:01:00 GMT

Hi,

I got FlashStream tool. But when I tried using it, I am getting the following error.

>FlashStream.exe bq27410G1_1_03.senc -dfi:fable_evm_0410_0103_CONFIGURED.dfi

Invalid wait time: -dfi:fable_evm_0410_0103_CONFIGURED.dfi

I downloaded this .senc file from BQ27410's product page.

Could someone please help me with this problem.

Thanks

Forum Post: RE: BQ24195 PMID

Stephen Jones — Tue, 21 May 2013 13:32:00 GMT

I am designing a Li-Ion/NiMH (3 x AA) charger for something similar to USB OTG. The unit requires a 5V rail of around 1.5amps, either from a Micro USB or via the batteries with smooth switch over, also the batteries will need charging. We are a host device with 3 USBs and a Micro USB wall power supply input. I did think of some variation of USB OTG such as the bq24195, however the Boost mode start up time is too long (200mS)and because it uses current termination for charging cannot fully charge NiMH battereis, though there maybe ways round that issue. Are there any more appropriate ICs I am missing

Thanks

Forum Post: RE: BQ34Z100 new chemical ID?

Sergey Gnatenko — Tue, 21 May 2013 13:05:00 GMT

Tom,

It is problematic for us to send two battery cells. What data do you need to define ChemID? May we request this data from the battery manufacturer or to carry out measurements by ourselves?

In order to work somehow with the evaluation module BQ34Z100EVM, I selected a box with ChemID=0431 (30229, 20Ah, LiFePO4, Tenergy) in the bqEVSW program on the bqChem tab and updated the Data Flash. Then I started the learning process. After charge cycle the UpdateStatus changed its value from 0х04 to 0х05. After discharged cycle the UpdateStatus did not change its value to 0х06. The learning process has not been completed. Is it because I selected a cell with a wrong ChemID or can it be influenced by other parameters?

What the ChemID influences on?

I carried out charge/discharge cycles before learning (1 cycle) and during the learning (2 cycles). At discharge I had the SOC count stopped on the values of 16% (before learning) and 22%, 25% (during learning), thus the battery voltage was 12,8 V (in all cases the same).

Then, upon reaching the battery voltage to 9.9 V the SOC value is set to 0%, as I understand it is influenced by the Cell Terminate Voltage=3300mV. What can influence the SOC count stop? On what the Cell Max DeltaV parameter influences?

Thank you in advance.

Sincerely,

Sergey

Forum Post: RE: BQ3050 Behaviour&Settings

Christophe Fauvel — Tue, 21 May 2013 09:39:00 GMT

Thomas,

After roughly 15 charge and discharge cycles (100% to 4%), the FCC value seems stabilized (2200 mAh).

The charge time and discharge time are identical for each cycles (max. 5 minutes delta), so the battery pack is healthy and the charging method is valid.

It appears that the issue is related to a wrong calibration method.

Best regards,

Christophe

Forum Post: RE: BQ3055 data flash access

Harini Sekar1 — Tue, 21 May 2013 09:13:00 GMT

Hi ,

I tried using '14' in the place of 'yy' to read charging current. It did not return the correct charging current value. I tried reading other data flash variables in the same way. But it did not work.

Thanks,

Forum Post: RE: Gauge Studio

Martin Augenstein — Tue, 21 May 2013 07:32:00 GMT

no answer - why???

Forum Post: RE: Battery Low% in Bq3060

santosh bangaru — Tue, 21 May 2013 03:16:00 GMT

Tom

Thank you for your response, yes i understood that these initial settings are for capacity estimation when start up. please let me know if possible- why these are set to that particular values why not other values.

Thanks

Santosh

Forum Post: RE: BQ27X00-TESTER programming issue

Jared Casey — Mon, 20 May 2013 22:42:00 GMT

Hello Joe,

Can you please follow the connection and guidelines outlined in the User's Guide for the bq27x00 Tester. That should get you up and running.

http://www.ti.com/litv/pdf/sluu227

Forum Post: RE: need help reset command bq34z100

ThomasCosby — Mon, 20 May 2013 20:33:00 GMT

Perry,

Issuing a reset command will not reset Update Status. You will need to reload the golden gg file. If Cycle Count is greater than 0, then you will also need to reload the senc file to initialize the internal cycle count.

Tom

Forum Post: BQ2002T Unknown state between Fast Charge and trickle

David Mittmann — Mon, 20 May 2013 19:00:00 GMT

I have 6 BQ2002T's idependently charging 6 9V NiMH's. Sometimes the CC pin will go from Fast chage (Steady VCC) to some randomly pulsating state and either stay in that state, or some time later going to trickle chage (286us pulse everly 18.3ms). I can cycle the power on the device and that same chip might not go into this non periodic pulsing state. Any ideas on this wierd state? Sometimes it only lasts a few seconds long, other times many minutes. I assume it is a filtering issue somewhere.;

I have 10.01uF on VCC, 100nF on TS, 100nF on BAT.