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EV2400: EV2400 LabVIEW Compatible?
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BQ20Z65-R1: Fuel Gauge % Jump During idle time
Part Number:BQ20Z65-R1
Hello,
We have a 4S2P Lithium ion pack with a 20z65 fuel gauge.
Our customers application requires the pack to partially discharge and then go through an extended idle time (12-24 hours) before fully discharging.
After about 4 - 6 hours the fuel gauge (SBS Screen) jumps up about 15 - 20%. Although some cells of different manufacturers causes the gauge to drop 10-12%.
Is there a way through the firmware to control this behavior? There are 5 LED's on the pack and we are trying to keep the state of charge consistent.
I have taken data on this behavior or a 30 hour period of time.
Thank you
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BQ27541: bqStudio support needed to program BQ27541
Part Number:BQ27541
hi all,
in a production enviroment we are using EV2400 (with 0.18v firmware) to program bq27541-v200 parts.
As there are some issuse with firmware etc. we are looking for some solution to manage tests and programming.
As we can see bqStudio is very good option, but there is no support for bq27541-v200.
Is there any option to add support for this NRND chip?
For now we are using some other config to program our chips and it is OK but we are not sure that this way is 100% correct.
It is quite urgent case - please let me know soon.
thanks a lot in advance
KR
Vincenzo
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BQ27520-G4: How to double up on gauges to accommodate a larger battery
Part Number:BQ27520-G4
Hi Guys
I have a need for a 48Ah Li-Ion battery by putting 16x18650 cells in parallel.
This is because our application should last (provide battery operation) for up to 24 hours from ~3.7V nominal supply.
But the bq27520 can only measure up to 32Ah and the BQ78350-R1 only does series cells (up to 320Ah though).
Can I split my battery pack (8 cells each) and use two gauges in parallel?
Kind regards
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BQ35100: Estimating battery lifetime in percent in EOS mode
Part Number:BQ35100
Hello, I found this post (pasted below) which is almost the exact situation I have, but was disappointed to see there is no solution in the thread - it went private. In my case the SOH is counting down by the max of 2% each time, but that is certainly far from reality as I am using a 19Ah LiSOCl2 cell.
The cell is recovering to the nominal 3.6V between load cycles.
On wake I enable and start the gauge, then my load profile is 40-50mA for up to 2min, then a 125mA pulse for 2s, then down to 10mA while the gauge is stopped, then into low power sleep.
While awake the voltage is drawn down to 3.4 - 3.5V, during pulse its close to 3V. During gauge stop it seems the voltage recovers to about 3.5V, but doesn't get back to 3.6V until the system is sleeping.
Do I need to put the system in low power sleep during the gauge stop period to ensure the battery fully recovers? I will try this and report back. It wasn't clear to me on the datasheet the proper procedure.
To make sure I am configuring the gauge correctly, here are the steps I am doing:
- Calibrate Voltage & Temp offsets, CC gain & delta. The board and CC offsets seem ok for my device.
- Write design capacity, design voltage, terminate voltage, cell count, max load
- Set EOS mode
- Write EOS trend detection pulse counts to 0
- Write EOS SOH smoothing start voltage
Is there any other config I am missing?
From the forum It looks like the default ChemID is appropriate for LiSOCl2 chemistry?
Thanks!
In reply to Eric Vos24:
Eric and Alessandro,
thank you both.
I can live with an somehow incorrect SOH if it just counts down from 100% to 0% in a consistent way until EOS is reached. Regarding passivation effects we are able to provide a constant discharge pulse. With this constraints, is it necessary to get an own TI Chem ID? If yes, what must I do to get one?
In the meantime I implemented BQ35100 on my PCB and made some tests. The BQ35100 is calibrated as prescribed in the docs with the help of Battery Management Studio. In my system when issuing a BATTERY_NEW command, SOH reads 100%. Perfect! But thereafter, the SOH counts down by 1% after each measurement which definitely does not reflect the reality. I think, there is something misconfigured. What can I do to debug this issue? Or maybe I just do something wrong when starting a new battery? What do I have to do to initialize a new battery correctly?
Thank you again!
Regards,
Oliver
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BQ34110: Data Flash writing not appearing to work
Part Number:BQ34110
Hello,
I recently acquired a bq34110 along with an ev2400 adapter, and am running bqstudio (with the latest version and firmware installed) to interact. Upon reading the documentation related to the bq34110 (specifically the technical reference manual and "Using I2C Communications With the bq34110, bq35100, and bq34z100-G1 Seriers of Gas Guages"), I began to perform some I2C communications in order to practice reading and writing various fields from the board. Upon starting with the data flash memory, however, I began to ran into some issues. I am able to read data flash just fine, but I am unable to write to data flash memory, despite following the documents step-by-step. I checked to see if the board was in full access mode (which it is), and I have voltage at a stable 3V (above the 2.8V minimum for Flash Update OK Voltage). Attached is a screenshot of the logs for one of the memory addresses I have tried to write to, but to no avail.
Attempting to write to Manufacturer Info Block A06 (attempt to write 22, current value is 00)
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BQ34110: Need help setting the registers in BQ34110
Part Number:BQ34110
Hi Support team
My customer is using a customer version of this battery
and they are asking for help setting up the registers in the bq34110. The battery a LiFePO4 in a 4S9P setup, but in a different shape and higher 10A max charging current..
Do we have a set up for this? or any experience working with this battery vendor?
Thanks
Jeff Coletti
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BQ78350-R1: BQ78350 SOC does not reach 0% at system shutoff voltage
Part Number:BQ78350-R1
I have configured the gauge with fixed EDV points
EDV0 = 3371
EDV1 = 3396
EDV2 = 3425
My battery packs have a design capacity of 2600mAh at 4.2V. I am only charging to 4.1V so I see an initial reduction in the capacity to around 2350mAh after the learning cycle.
The SOC gets to 2-3% when the system shutoff occurs. I have attached logs from the system.
I would like for my gauge to hit 0% SOC, possibly occurring before the system shutoff point.
For this I tried to configure the reserve capacity as 5% of the design capacity (2600mAh * 0.05 = 130mAh). When I did this I initially noticed that the learned FCC, upon reset, was reduced by 130. Then when I started the test it reported a higher capacity until a learning cycle occurred.
I still do not get the SOC to report 0% with the reserve set as I intended. The learned FCC was reduced at this point from ~2340 to ~2140mAh. Do you think that the battery packs are exhibiting a non-recoverable loss in capacity at this point? I have completed ~20 charge/discharge cycles. The initial cycles seemed to go from 4100mV to ~2800mV per cell. Now the discharge goes from 4100mV to 3334mV before shutting off.
How do I configure such that the end of discharge reaches 0% SOC?
Since I am using a fixed EDV am I going to run into issues as the pack ages and the capacity is reduced? Will the EDV points need to be updated or changed? Is this handled in a CEDV config?
Zip file includes:
1. Earlier discharge
2. Current discharge (has reserve capacity of 130mAh included)
3. Config (.gg.csv)
Thanks,
John
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BQ34Z100-G1: Bq34z100 evm - How to configure for lead acid batteries?
Part Number:BQ34Z100-G1
I am using bq34z100EVM for monitoring 12 V Lead Acid battery from Leoch (LP12-9.0 (12V8.6AH)). The evm seem to be pre-programmed for monitoring 1 cell Li-ion batteries. When I connect a lead acid battery to the evm I get measurements as shown in the below screenshot. It shows battery voltage as 585mV and 0% charge even when the batteries are fully charged. I understand from the datasheet SLUSBZ5B that we need to make some changes to the data flash configuration data for the gauge to start measuring correctly. However, I am unsure as to the changes that needs to be made to adapt the baord for Lead acid battery measurements.
1) I have configured the evm hardware with J5 set to measure >5 and J2 configured for 16V. I am using EV2300 to interface it with the PC. And I am using BqStudio V 1.3.86
2) What are the parameters that need to be changed using BqStudio so that I could re-cofigure the evm to work with Lead Acid batteries?
3) I am unclear about certain parameters like no of cells. For lead acid is it by default more than 1?
3) Can TI provide me with a standard gg.csv file specific for Lead acid batteries to start off with. I know I may have to do some calibration id to get the closest Chem-id for better accuracy.
4) I have also attached the current data configuration file gg.csv file exported from the evm.
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BQ34Z653: Mass Production question
Part Number:BQ34Z653
Hi Team,
The current EVSW version hasn't support reading .DFI/ROM file.
Is there any tool support it?
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BQ34Z100: Golden file example, SOC accuracy and current sense input resistors questions
Part Number:BQ34Z100
My customer has the following questions:
1. Can you provide us with an example golden file for the BQ34Z? The cell that we will be using is INR18650_F1L (Li-ion) and GP210AAHCB (NiMh), both cell data sheets are attached. Can you please check and confirm if you already have the Chem ID and the golden file for these cells?. If not, what is the process of getting the files?
2. Does the Gauge require to do a calibration over time to main the SOC accuracy?, does it need host intervention?
3. In the flags() status register, what action is expected from the host if the condition flag (CF) is set?
4. The Rsense that we are currently using is 20mohm, is it OK or do we need to change it for better accuracy?
5. We have to also consider any intrinsic safety (IS) implications for the design and as such I have the below question.
On pg. 47 of the datasheet, the schematic shows 2 low pass filters , one for each node across the sense resistor. The values are R5, R6=100ohm, C5, C6 = 0.1uF. The cut off frequency is around 16KHz.
We will need to increase the resistance from 100ohm to 470ohm for IS requirements and as such to maintain the cut off frequency, have to change the capacitors to 22nF. So the new values will be R5, R6 = 570ohm, C5, C6= 22nF.
Do you see any concern with this change, I believe both these nodes should be high impedance and changing resistance from 100ohm to 470ohm should have minimal impact?. Can you please confirm and also pose this question to the factory if this change is OK.
Thanks!
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BQ34Z100-G1: High Current Calibration
Part Number:BQ34Z100-G1
Hello everyone;
y BMS system will go to about 120A currents. So I have to calibrate the current,Division ratio 4. When I calibrate in this way, what should I pay attention to when writing the value of my other parameters?
For example; Since I use the division ratio when the capacity is 27000mAh, should I write it as data memory 27000/4 = 6750mAh ? How does the Design Energy value change in this case?
Sincelery
Faruk Sözüer
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BQ27421-G1: Hibernate mode current test condition question
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BQ78350: EDVx details
Part Number:BQ78350
team,
The EDV2, EDV1 and EDV0 are voltage points that is calculated by the IC for SOC7%, SOC3% and SOC0% for CEDV.
These voltage points are dependent on temperature and current during discharge, is it correct?
When a battery ages, should we expect the EDV2, EDV1 and EDV0 to be lower as compared to a new battery under same current and temperature?
Thank you for support.
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BQ40Z60: bq40z60 AFEC flag set
Part Number:BQ40Z60
Hi All,
I'm using a bq40z60 in my battery pack. I've had a failure where the unit stops charging and discharging and the AFEC permanent fail flag is set high. I understand that AFEC is an AFE communications failure between the analogue front end and the MCU. How can I identify what is triggering this and what is the best way to prevent it? Are there ways to mitigate these issues? Is it better to just turn this failure mode off altogether if there is nothing I can do to prevent it?
Any help would be greatly appreciated.
Thanks!
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BQ28Z610: MSDS report
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BQ27750: Setting Term Smooth Time above 255 is not possible
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BQ40Z50-R2: Will not charge unless there is SMBus communication with the part.
Part Number:BQ40Z50-R2
Hello,
I presume the problem we are observing is related to a flash setting, however, we are at a loss to identify which one.
Our battery pack design functions just fine; except the battery will not charge at all unless there is SMBus communication with the part. As soon as the SMBus is disconnected, or communication stops, charging stops.
NR=1 and the charge FET is configured to be ON in sleep mode.
Thanks,
Joe Perino
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BQ34110: Difficulty getting FC to set
Part Number:BQ34110
Hi,
I'm using the BQ34110 with 5 series NiMH cells (nominal voltage 1.2V/cell), and I'm trying to follow the procedure to generate the GPC logs so I can get the correct CEDV parameters. However, I'm running into two issues:
1) I'm having a hard time getting the FC bit to set after a full charge, so when I try to run the GPC Cycle, it's stuck waiting for FC=1 forever. It seems setting this bit is somewhat dependent on the current EDV thresholds (the default values for which seem like they're for a Li-Ion cell), so do I need to change these values in order to make the chip realize there has been a qualified charge?
2) I am able to calibrate the voltage measurement, but I'm seeing huge measurement error the further away I get from the voltage at which I calibrated. I am using 1% resistors for my external divider at the moment, but I have ordered 0.1% values as a precaution. That being said, it seems odd the voltage measurement is off by so much.
Thanks for your help!
Kyle
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BQ4050: System Present pin - can I leave it floating?
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