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gas gauge
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  • Forum Post: BQ27X00 Fuel Gauge has NAC freeze, even though voltage and current are still changing, EDV1 flag does not trigger

    Alex Dunfield50166
    Hi, I have a fuel gauge in a battery pack, and have noticed that during discharge the NAC (nominal available capacity) decreases gradually from the starting value of about 1500mAh until it reaches 560.13 mAh, and then it stops updating. However, the voltage is still at 3.3V, and the current draw is...
    on May 14, 2010

  • Forum Post: BQ27510 Production Code

    Nick Moore
    I have written the firmware to program the BQ27510 from the three page flow chart from Going to Production with the bq2750x. However, every time I read register 0x66 to see if the data=0x00 I get the data to equal 0x37. Does anyone have any idea why this might be happening? I'm thinking maybe...
    on Jun 22, 2010

  • Forum Post: 24V Lithium battery design 7s19P

    Mike_chute
    we are investigating a new 24v 32amphr -85amphr battery design using litium batteries. The design would be 7S7P to 7S19P. We have experience with the BQ20Z95 so the BQZ20Z65 would work with the 7S7P design. What Ti system would you recommend for the 7S19P. It will need to have a led fuel guage output...
    on Jul 9, 2010

  • Forum Post: Gas Gauge for 12V, 6000mAh NiMH battery pack

    Matthew Karau
    I'm looking for a (stand-alone with serial I/F) gas gauge / coulomb counter that is compatible with a 10-cell (12V, 6000mAh) NiMH pack. My searches on TI.com have returned ICs specifically compatible with Li+ and Li-Poly packs or lower voltage NiMH packs. Can anyone advise if these ICs can be easily...
    on Aug 2, 2010

  • Forum Post: Re: Gas Gauge needed

    dMax
    Hi Alfredo, Including a gas gauge function in your project means that you could accurately know the remaining capacity (in mAh), state of charge (SOC in %), run-time, and many other details about your battery condition. Some "smart" batteries such as those in your laptop computer have a...
    on Oct 11, 2010

  • Forum Post: ev2300 with 9.59 bqEasy software won't detect

    Allen Vandiver
    Hello, I have version 9.59 of the bqeasy software (downloaded from http://focus.ti.com/docs/toolsw/folders/print/bq20z90evm-001.html ) and I am trying to connect to a bq20z90. I have verified that the chip is actually a bq20z90, though I don't know what version. It won't autodetect the chip...
    on Oct 26, 2010

  • Forum Post: Where is the "bq27x10EVM For Dummies" guide?

    Barry Klein
    I have the bq27x10EVM wired to the EV2300 I2C USB communications unit and the software loaded and operational. Thing is, I don't understand the process of evaluating the bq27210 part using it. I am using a 5000maH LiPoly battery. I have an electronic load and a charger available for connection...
    on Nov 20, 2010

  • Forum Post: Re: Evaluation module BQ20z95EVM-001 could not establish communication with bqEASY Software.

    Raghu Kodi
    Hi, We had no problem in installing EV2300 drivers. We have applied a voltage of 16v across 4-resistors of 470 ohms. We ignoed all warnings and get to SBS screen and pressed the "refresh" button. Still, we were unable to establish the communication. At very first time, when we connected...
    on Jan 27, 2011

  • Forum Post: Re: BQ20Z80 & BQ29312 Execution time for Voltage update, during SLEEP Mode. (SLUA380 Page 95)

    Nicolas TAUZIN
    I did not talk about the interval, i am talking about the execution time. For the current measurement (Page 95/232 SLUA380) : "It is imoportant to note for the settings of this register that it takes about 1 second to measure and update ..." For the voltage measurement (Page 95/232 SLUA380...
    on May 16, 2011

  • Forum Post: Operation of the charge and discharge lines on the BQ20Z95 gas gauge chip.

    Neil Ragsdale
    As follows: 1) With the gas gauge in reset (Pins 30 and 35 held low) I get about 1.8V on Pin 1 (DSG) of the gas gauge chip and 14.5V on Pin 44 (CHG). Does this seem about right? My battery voltage is 15.6V. 2) In normal operation with the gas gauge enabled wouldn't both of those...
    on May 24, 2011

  • Forum Post: Question about current offset calibration in BQ20Z95 ...

    Neil Ragsdale
    Presently our hardware places a light load directly on the battery pack. That light load is there all of the time and powers the microprocessor. That means that there is a current flowing through the batteries in addition to the internal leakage of the cell. Questions: 1) Is there an offset current...
    on May 27, 2011

  • Forum Post: Re: Help with bqEasy chemistry test

    Nicholas Alunni
    Update: Instead of using the chemistry test instead I've opted to manually log the bq20z65EVM and then hopefully someone here can figure out what type of battery it is for me. I've seen on a bunch of other forums posts TI Employees letting people know which battery chemistry they're using...
    on Jun 8, 2011

  • Forum Post: Help with bqEasy chemistry test

    Nicholas Alunni
    Hello, I'm trying to determine my batteries chemistry to calibrate the bq20z65EVM but I'm running into quite a few problems. I was hoping someone here might be able to help me. I'll do my best to describe what I've done so far and the problems I'm facing. Process: I've...
    on Jun 7, 2011

  • Forum Post: Re: BQ20Z95 Reverse Current During Discharge Protection

    Neil Ragsdale
    Just to clarify a couple of things from Thien. We need a way to quickly determine if current from the battery has changed value (decreased) or reversed direction from the battery. Would there be a particular pin on the BQ20Z95 chip that would indicate this?
    on Jun 9, 2011

  • Forum Post: bq20z65evm first run problems

    Frank Thomas
    Hallo, I just got my bq20z65EVM board for evaluation. What I first did was that I connected a charged LiPo battery (2 outputs: +/-) to the 1N und 2P (and shorted the other 2P..4P) to pick off the respective voltage (8.2V) at the pack+/pack- connector but it didn't worked. So what did I wrong or...
    on Jun 13, 2011

  • Forum Post: BQ20z45-R1 MOSFET control

    BicycleRepairMan
    Hi I need to be able to control the charge and discharge MOSFETs when the fuel gauge has been sealed, is there a way of doing this? The ideal functionality is a SMBus software SYS_PRES function or allowing the FETControl command to be used when the battery is sealed. I have a BQ20z45-R1 EVM and a 4S...
    on Jul 5, 2011

  • Forum Post: BQ78PL116 SMBUS pack voltage scaling?

    Modesto Torres
    I have an aplication where my cell voltage range is from 1.3V to 3.0V. The cell voltage range for the BQ78PL116 is from 2.5V to 4.5V. I really like to use this chip. I was thinking about adding a voltage multiplier in the cell so I can input it to v1, v2, v3, and so on. But the pack voltage that the...
    on Jul 27, 2011

  • Forum Post: Development Bq20z75 without external charger

    Rogerio Dias
    Hi, I am working with GAS GAUGE bq20z75, charger Bq2000 and Voltage protection bq29212. Pack Battery 3 cell's 2200mAh (3S1P); Charger/Discharge Operation 0.5C ; Source: 15Vdc 1A Would I like some information, if it is possible to developlment bq20z75 without extern charger? What...
    on Aug 16, 2011

  • Forum Post: Using the Chem.log file produced during chemistry learning cycle by the TI EVSW with the EV2300...

    Ez430_User
    Is there a way to associate an unlisted Li Ion cell to the best match known chem id using the Chem.log file produced by the TI EVSW with the EV2300 during the automated chem learning cycle? If so, how? If not, can this association be done manually? Logged data and graph are attached, I hope. Thanks in...
    on Aug 26, 2011

  • Forum Post: About Bq26200 and bq26231 Shunt Resister Question

    March Jasper
    Hi. I have question for ba26200 and bq26231 for Shunt Resiter setting. Now we thinking this Shunt Resister 0.02 ohm change to 4m ohm or under 2m ohm. Can possible change about this shunt resister vale for device? And could you tell me something comment for change shunt resister vale ? ...
    on Sep 29, 2011

  • Forum Post: About BQ76PL536 Ternination Circuit Question.

    March Jasper
    Hi Roger Thank you very much many help. Tnanks a lot about phone call, but My country is Japan, time is diffrent. Any way I have question for about PL536 Termination Circuit. We started PL536 Schematic design, but we found about this one. 1) SP-IN Capacitor connected to VSS by Data Sheet...
    on Oct 21, 2011

  • Forum Post: gas gauging of primary (non-rechargeable) Lithium battery packs

    Ross (TI E2E)
    would like to know if anyone has any experience in gas gauging primary Lithium (non-rechargeable) battery packs. in the bqeasy software for bq20z95 you can update the chemistry to Li-MnO2, but i am wanting to do gas gauging of Li-SOCl2 and Li-SO2Cl2 (Lithium Thionyl Chloride and Lithium Sulfuryl Chloride...
    on Jul 12, 2011

  • Forum Post: bq27510-G2 configuration system side - Queries.

    khodidas ghinaiya
    (1) Deciding Capacity of battery in %: From the data sheet of bq27510-G2 it seems that StateOfCharge( ) i.e. SOC register represent capacity of battery charge from 0 to 100% in step of 1%. In other word it represent battery capacity in %. SOC: State-of-charge at any moment, defined ...
    on Oct 8, 2011

  • Forum Post: BQ27510 with 4 batteries

    Dan-o
    I need to design a system side gas gauge for a lithium ion battery pack with 4 cells. This is a "closed" battery pack, so I don't have access to the individual cells or a thermistor within the pack. Obviously this is not an ideal situation but I am trying to see if I can make it work. ...
    on Jun 29, 2011

  • Forum Post: BQ27541-V200 Data Flash Range for User Rate-mW

    Lance Collins
    I get an error when I write 14000 (14W) to the "User Rate-mW" register in the BQ27541-V200 Data Flash. My battery application draws roughly 14W constant power, so I want the Gas Gauge to predict remaining capacity based on this expected power. The range for User-Rate-mW is 30000 to 140000 ...
    on Jan 4, 2012
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