Part Number:BQ34Z100-G1
Hi, we are using custom made battery packs with BQ34z100-G1.
One of our batteries shows 0% even after first full charge. The battery is at customers office so I can not access it to read the data.
I have never experienced something like this with BQ34z100-G1.
What might be the solutions? Try to discharge/charge it again?
Or only way to deal with this is to get the pack to our office?
Best regards,
Karlis Tucs
Part Number:bq28z610
I have a design with the bq28z610 part configured for 1s operation where the CHG FET turns off when the device enters SLEEP mode.
The pack is configured to wake on successful I2C comms and then return to sleep after 30s of no comms. This seems to work fine. Although, sometimes the first transaction on wake is hit or miss if it is a command write.
The pack is also configured to wake on current comparator around 200mA. I'd set it lower if I could, but this is at the lowest setting for the sense resistor used.
When I attempt to "wake" the pack via discharge (because the CHG FET is off), at a low current, the CHG FET turns on (after ~2s) and the voltage increases which I assume is the CHG FET diode protection feature.
When discharge is removed, the CHG FET turns off in ~2s. I assume the internal state is still "SLEEP". This seems like the expected behavior. IFF I switch to charge fast enough, I can charge the pack.
When I attempt to "wake" the pack via discharge above the wake comparator threshold, the CHG FET turns on (almost instantly) and the voltage increases which I assume is "wake via current".
When discharge is removed, the CHG FET turns off in ~2s. I assume the internal state is "ACTIVE".
Is this the correct operation? My question is related to the last state above: Can I increase the time in "ACTIVE" to match the communications timeout? 2s is too short for our ATE to switch from DSG to CHG reliably and it does not have communications capabilities. I cannot find any settings to set this time. I was hopeful that it was based of off average current or that it would use the comm timeout, but that does not appear to be the case. Please advise.
Part Number:BQ76930EVM
Hi,
From the provided schematics in the datasheet it is very difficult to tell which pins can be accessed by voltmeter probes, jumperwires, etc.
Are there any available connection points for things like: hooking a wire up to the CHG line? Can I use a voltmeter and access the VC# terminals? Is there any way to install my own thermistor?
Thank you!
Part Number:BQ34Z100-G1
Good afternoon.
I am attempting to implement the BQ34Z100-G1 (using the evaluation module) to gauge the SOC of two series CR123 batteries.
These batteries are not rechargeable, meaning when they are "dead" they are replaced with a fresh pair of batteries.
So I believe I have set the chemistry properly and all of the flash parameters, but I am unsure if I will ever successfully complete a learning cycle...
In most documentation I have read, you are required to charge the battery pack which is part of the learning cycle, however when I get to that point I simply replace
the batteries. In doing so it powers down the evaluation module which then comes up again with the new batteries.
Will I ever complete a learning cycle this way, or am I spinning my wheels? Secondly are there any other flash parameters that need to be set to allow for this?
Thank you for your time.
Part Number:BQ27510-G3
Hi,
The customer consider to use bq27510-G3 with NCR18650BF (ID:2050) battery and we know that this battery was characterized with 4.2V charging voltage and 2.5V EDV. But now they'd like to use this battery with 4.1V charging and 3.0V EDV in their system. Then please let me ask following question.
Best Regards,
Satoshi / Japan Disty
Part Number:BQ40Z50-R2
Hey,
I am a newbie working with BQStudio, i need to unseal the device only using the manufacturer block commands is the requirement
In BQStudio, i realised that the device can be unsealed only after pressing the UNSEAL command button at the right side and then we need to press the UNSEAL keys in the Write block.
Is there any way to unseal the device without the need of pressing the button, as this process needs to be reused.
I have tried setting the SEC[1], SEC[0] flags when sealed, but this didnt help me unsealing the device
Part Number:BQ27542-G1
Hi there,
I have a problem with regards to the BQ27542-G1 device.
I am currently trying to produce a data log file for Chem ID Selection using a 6100 mAH 3.2V LiFePO4 battery but the battery is not charging so I am trying to update the registers of the gauge so that the battery can charge at about 3.2V. The battery's max charge voltage is limited to 3.65V so I do not want to overcharge.
I updated the parameter Q&A as shown below.
I also edited the charge voltage (could not find the parameter to change charge current) under Data Memory as shown below but still the registers don't update so gauge does not enter the state of charge. See charge voltage register below.
So I have the following questions.
1. How do I update the charge voltage and current under Registers?
2. Am I doing the whole procedure wrong?
3. What should I do differently?
Part Number:BQ40Z60
Hi,
I am seeing the SS flag set to 1 in the operations register. When looking through the documentation it states this bit is associated with safety mode.
a) what is safety mode?
b) what limitations are put on the device when this bit is set?
c) How do I clear the SS flag bit?
thanks,
Keith.
Dear all:
Is BQ80201DBT’SBS command different from bq20z95? The same command returned different results. Where can I download the bq80201 Technical Reference?
Thanks very much.
Part Number:BQ34Z100-G1
Hi all,
I'am currently using a BQ34Z100 on a 1S8P LiFePo4 pack.
I was quite satisfied with room temp performance, but observed SoC unreliability at low temp (SoC jump to 0% when 0°C reached)
After a bit of reading, I tried to run GPCRB.
Calculation failed, with the below message :
Error: negative low temperature resistance observed, R=-16.1300087673119 usually caused by wrong chem ID selection
So I decided to proceed with GPC to confirm my chemID choice (I initially didn't because the cell manufacturer is listed in bqstudio chem id list and indicate us which chemID we should use).
Calculation works, but with high deviation to the closest chemID (which is not the expected one ;-)
Best chemical ID : 434 Best chemical ID max. deviation, % : 19.48
I tried with 2 different recorded cycles, but result is more of less the same. Could you please advice on what can be my next step, to select a proper chemID and get it optimized for low temp ?
Best regards
Benoît
Part Number:BQ34Z100-G1
Hi Sir, Madam,
Do you have simple reference design for BQ34Z100-G1?
My customer currently is studying the reference design for BQ34Z100-G1 EVM and realized the size can't fit their small board size application.
Hope to hear from you soon. Thanks.
Part Number:BQ28Z610
Hello,
i have an handheld device with removable battery pack. The battery pack is loaded in an external charger. Now i am taking the opportunity to implement some fuel gauging into the battery pack. It is a single Cell Li-Ion battery and i prefer the bq28z610, mainly because of the integrated protection. Another candidate would be the 27542-g1. Now i am trying to figure out which charging IC accompanies this fuel gauge? The datasheet of the bq28z610 states that the device enables autonomous charge control but i am unable to identify suitable chargers... can you point me in the right direction?
Part Number:ev2400
I wanted to build my first BMS and started by getting a BQ76940 Eval board and a EV2400.
Last week friday i received both parts and pluged the EV2400 into my computer via the included USB Cable.
- all tree LED's on the EV were on but it wasn't recoginced by the coumputer
I added connected the I2C port to teh Evalboard
- still all tree LED's were on but the ev was still not recogniced by the computer or the BQ76940 Eval Software
also tryed by installing the EV2400 Support Components
- still didn't work
What could be the problem. from what i read it should just work. so I think something on my EV2400 is wrong. any suggestions?
thanks for your help
Part Number:BQ34Z100-G1
Hi
I am using battery management studio(1.3.80) for bq34z100-g1 and ev2300 . I want to use learning cycle but there is no learning cycle tab in the toolbar.
Can you say why learning cycle tab has not been seen in the battery management studio.
I really appreciate any help you can provide.
Part Number:EV2400
Hello,
I've been working all morning with battery connected to a EV2400, communicating via USB to my laptop. It's been fine all morning. The battery just ran down, so I've put it on to charge, and now the EV2400 does not communicate via USB. No bing-bong when I plug it in, and no communication with bqStudio. What could have happened?
Kind Regards,
JB
Part Number:BQ34110
Hello Team,
I am looking at using the BQ34110 to gauge a 12V SLA battery that will be float charged to 13.6V for the majority of its life. This battery system will rarely be drained.
I would like to get clarification on the LEN output and how that interacts with the system. From my understanding, the LEN pin should be connected to a TTL mosfet with a resistor that will drain the battery about 1% periodically to help with the EOS calculation. However, in my application the battery will be float charged to 13.6V. Will this be a problem?
As for the temperature monitor, how precise does the NTC thermistor need to be? I am asking because I want to put the thermistor on my PCB board which is close to the battery. Would this have enough accuracy for the calculation, or does the thermistor need to be applied directly to the battery?
Lastly, the datasheet says the BAT pin needs to be between -0.3 and 5.5V. I used a voltage divider (620K and 150K ohms) to reduce the voltage down to about 3V from the 13.6V charged battery. The voltage will stay between 2-4V when the battery is drained and then charged up again. I picked 3V for the voltage divider because it was close to the middle of the tolerance for the pin. However, I am wondering if there is a more suited voltage I should divide the 13.6V rail to or if 3V if sufficient. As a follow up question, I assume that the Battery Monitor will give us back the 3V voltage value via I2C and then we do our own computations to compute what the actual voltage is? Is this correct?
Thank you for the support!
Jared
Part Number:BQ78350-R1
Hello,
I have a few questions about the BQ78350-R1.
Question 1: I havent found any pullup-resistors for the SMBUS communication. I thought, that it is nessecary to use them in this bus. If you are using pullup-resistors, where can I find them?
(Refering to the SMBUS-Made-Simple.pdf, there must be 10 kOhm resistors.)
Question 2: Refering to page 7 of the Application Report of the BQ78350-R1, we want to measure the voltage accross one cell. In the figure, the circuit can measure the voltage across the top cell.
But I am working with 4 cells, how can I know, which cell I should to choose for measuring. Instead I thought, I could use a dipswitch, so I can always choose which cell I want to measure, what do
you think about this idea?
Thanks for your help.
Part Number:BQ20Z65-R1
Simple question - Is it possible to disable the PEC byte sent in the broadcasts from this chip WITHOUT having access to the data flash (i.e. when the chip is in "sealed mode")?
I know the broadcasts can be turned off entirely (set bit 14 [ChgM] to “1” in register 0x03), but I would like to disable just the PEC because, shockingly, none of TI's charge controllers support it.
Thanks
Hi,
I was following the order that was given in this file 
I was dicharging the battery with 2100 mA but after some minutes I noticed that I lost detection of the battery and bq34z100-g1. I separated the battery from the device and measure its voltage but it was shown zero. Is there any one who know what happend for the battery and the device.
Thank you,