This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Part Number: BQ34Z100-G1
I see abrupt changes in SoC, SoH, temperature, current and voltage. Below is FuelGauge trace from my equipment
1. What could cause below abrupt changes in SoC, SoH, temperature, current and voltage?
2. We can reproduce this reliably in 4-12 hrs span. What other parameters from bq34z100-G1 do you want us to record that may help with investigation?
3. I have two other devices on same I2C bus as bq34z100-G1 (total 3). Is this okay?
4. Can I issue reset 0x0041 command when I see SOH = 0 or cstatus=0? Is there a better indicator of FuelGauge fault that warrants a reset 0x0041 command?
"10/21/2019 6:58:01 PM",vbat = 12056, ibat = -131, temp = -33.15, soc = 26, soh = 100, rcap = 135, fcap = 528, avgcur = -116, cycles = 8, cstatus = 0005
"10/21/2019 6:58:02 PM",vbat = 12000, ibat = -131, temp = -33.15, soc = 26, soh = 100, rcap = 135, fcap = 528, avgcur = -117, cycles = 8, cstatus = 0005
"10/21/2019 6:58:03 PM",vbat = 11964, ibat = -121, temp = -33.15, soc = 26, soh = 100, rcap = 135, fcap = 528, avgcur = -118, cycles = 8, cstatus = 0005
"10/21/2019 6:58:05 PM",vbat = 14400, ibat = 0, temp = 19.85, soc = 0, soh = 0, rcap = 0, fcap = 4500, avgcur = 0, cycles = 8, cstatus = 0000
"10/21/2019 6:58:06 PM",vbat = 12052, ibat = -112, temp = -33.15, soc = 0, soh = 0, rcap = 0, fcap = 375, avgcur = -7, cycles = 8, cstatus = 0005
Are you saying the values measured by the gauge for voltage, current and temperature were inaccurate? What condition was the gauge operating in when this occurred? Was this in a lab/controlled environment or was the chip susceptible to ESD/EMI? ESD/EMI are two factors that could cause wrong readings.
What does your schematic look like? Do you have any components inbetween the cell and the voltage measurement terminals of the chip. Can you reproduce this issue while logging with bqstudio so we could have proper log files of the events? Can you also share your schematics?
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to Onyx Ahiakwo:
Hi Onyx --
I am the software engineer on this project for Padam, he is out of office this morning. I don't know the answers to all of your questions, but this is reproducible consistently by putting our board at -40 C, after about 3-4 hours we will see state of charge drop to 0 from ~90+ %. We have also seen other variables read out from the the gauge be incorrect at these times as well.
Unfortunately I am not sure about the finer details of our board design, and am not sure how much from the schematic I am allowed to share, so will wait for Padam to return answer these questions.
With new debug traces I am seeing Battery Voltage at temperature -35 to -40 degC momentarily drops below 11V and bounces back to 11.5 or higher within 1 sec. My system's average current draw is 125mA and peak current is 2A for 300ms (once a minute).
My Current Cell Term V is set to 2750mV/cell. With 4s3p config it is set to 11V.
Is there a way to attach time interval to Cell Term V so that FuelGauge ignores momentary voltage drops below < 1 sec?
I am looking into NDA situation so that we can share files, schematic, layout etc. More on that later.
In reply to Padam Swar:
Unfortunately not on this gauge.I would suggest you use the reserve capacity function so there gauge reports 0% SOC at a higher voltage.
Is there another model fuel gauge that supports terminate voltage threshold with time interval?
Ideally that fuel gauge needs to support LiFePO4 and lead acid chemistry. At a minimum must support LiFePO4.
The bq40z50-R3 supports LFP
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.