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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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BQ4050: System Present pin - can I leave it floating?
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bq30z50: lifetime data, block 1; how to transpose?
Hi team!
Kindly advice how to transpose 'lifetime data block 1' to corresponding parameters.
I see following description in bq30z50 TRM, sluu852a:
Output lifetimes values on ManufacturerData() in the following format:
AABBCCDDEEFFGGHHIIJJKKLLNOOPPQQRRSSTTUUVVWWXX112233445566 where:
• AA: Max Cell Voltage 1
• BB: Max Cell Voltage 2
• CC: Max Cell Voltage 3
Here parameters which usually require 2 bytes represented just by 1,. for example, if AA=0xd9 what is corresponding 'Max Cell Voltage 1'?
Thanks a lot for clarification.
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BQ27421-G1: bq27421-G1B battery chemistry
Part Number:BQ27421-G1
We're using the bq27421-G1B fuel gauge IC.
The older version of the bq27421-G1 technical reference (SLUUAC5, June, 2013) states:
• bq27421-G1A is pre-defined for LiCoO2 -based batteries for 4.2 V max charge voltage.
• bq27421-G1B is pre-defined for LiMn2O4 -based batteries for 4.3V or 4.35V max charge voltages
The revised version SLUUAC5C (Aug, 2016) states:
• The bq27421-G1A fuel gauge is predefined for LiCoO2-based batteries for 4.2-V maximum charge voltage.
• The bq27421-G1B fuel gauge is predefined for LiCoO2-based batteries for 4.3-V or 4.35-V maximum charge voltage.
• The bq27421-G1D fuel gauge is predefined for LiCoO2-based batteries for 4.35-V or 4.4-V maximum charge voltage.
We're using an IMR (LiMn2O4) battery with the bq27421-G1B fuel gauge. Is the bq27421-G1B accurate enough to gauge the LiMn2O4 batteries?
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BQ27421-G1: full chgarge setting
Part Number:BQ27421-G1
Our circuit reads StateOfCharge (0x1c, 0x1d) of BQ27421 and checks Battery Level.
Charging time 90 minutes Charging I want to display the fuel gague level of the last 50 minutes as 100%.
(When CHARGE_COMPLETE state of charge IC is judged as completion of charging)
* Battery: 3820mAh, 14134mWh
* Refer to 3.1 Data Memory Parameter Update Example in the document "SLUUAC5C-June 2013-Revised August 2016"
and write "0x4A 0x0E, 0x4B 0xEC". Then the time to maintain 100% is reduced
* What should I do to make Charge IC's CHARGE_COMPLETE state detection and fuel gague 100% display close?
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BQ27220: BQ27220 Sleep current
Part Number:BQ27220
Hi,
When the BQ27220 is in SLEEP mode, it will wake up every 20s to update itself.
When it wakes up, does it integrate its own quiescent current into the coulomb count? Since it is a constant current value (~9µA) and periodicity is fixed (20s), I would expect it to do so
My application is a low power IoT application where sleep current is an important factor to take into account
thank you for your help
Yannish
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BQ40Z50-R2: bq40z50-R2 Gauging Embedded Firmware v2.08 - wrong ZIP file contents
Part Number:BQ40Z50-R2
Hi,
We're making prototypes of new project, that have bq40z50-R2 onboard. bqStudio says, that Device ID is 4500_2_08. I suppose, that it's about 2.08 Firmware;
When I go to www.ti.com/.../toolssoftware , download bq40z50-R2 Gauging Embedded Firmware v2.08 (ZIP 4249 KB ) - and unZIP it, I find, that it contains 2.11 version of firmware.
Could you fix it, so that archive contains correct firmware, ASAP, please?
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BQ40Z50: Broadcasts in sleep mode
Part Number:BQ40Z50
Hello,
if the device is in sleep mode and BCAST=1, does the device wake up every x seconds to try and send the broadcast messages?
Thanks,
Sebastian
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BQ27441-G1: Battery error code
Part Number:BQ27441-G1
Customer have integrated the BQ27441 IC with Qualcomm processor. Driver probing was successful. But are getting calibration and other property error codes as below. Kindly help us to proceed further.
battery 5-0055: battery is not calibrated! ignoring capacity values
power_supply battery-0: driver failed to report `charge_full_design' property: -107
battery 5-0055: battery is not calibrated! ignoring capacity values
power_supply battery-0: driver failed to report `charge_full_design' property: -107
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BQ40Z50-R2: Balancing issue
Part Number:BQ40Z50-R2
Hi,
We are seeing the issue of 4S8P 19.2Ah LiFePO4 battery pack is not charging to 100%.
The pack was able to charge to 100% in the beginning of production but after 4 months of usage, the pack is able to charge up to 80% only. When we read the pack through battery management studio, the cell 2 has shown up zero balancing time where as cell 1, 3 and 4 balancing time are higher ( refer to attached image ).
During charging, Cell 2 reaches 3.6V when other cells are in the range of 3.5V. During discharging cell 1 drops to <2.8V.
When we disable the cell balancing ( CB, CBR, CBS=0), pack is able to charge to the full capacity.
what are the parameters affecting the cell balance time calculation ? Is there any provision to change the settings to voltage based balancing instead of capacity based balancing as in bq78PL116 ?
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BQ78350: Discharging is not operatiing normally when I use bq78350+ bq76920+bq76200 to implement my design.
Part Number:BQ78350
I design my gauge board refering to document tidrqy7.
In my design, I dIdn't use the precharge function， and I only use Q1 and Q5 to control discharging and charging.
When I apply a load to PACK+ and PACK-， the out voltage of PACK+ of PACK- drops down to 9V， while the the voltage is 20V before I apply the road.
The waveform of Vg of Q1 and Q5 is showed as follows.
When I removed Q1 and Q5，Vgs of Q1 and Q5 are all 10V.
I can't find the reason of the drop of voltage and the reason of the waveform of Vg.
Could you find out the reason causing the problems?
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BQ30Z554-R1: Is BQ30Z554 EVM available to purchase?
Part Number:BQ30Z554-R1
Hi,
I'm looking for an evaluation module (EVM) for TI BQ30Z554-R1 chip. I couldn't find such information on TI website. Can you please assist?
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BQ34Z100 and Tenergy 20Ah CHEM_ID=0x431
Hello everyone,
I would like to ask, if it is normal that when I charge my 20Ah LiFePO4 battery to 100% during the learning cycle (with Impedance track enabled, device capacity set to 20000, number of series cells set to 3) and then try to discharge it, everything seems to work well, but when the SOC of the battery hits 15%, it stops changing and just stays at 15% even if there is -1200mA flowing out of the battery...
Thank you for any suggestions,
Have a nice day,
Marek Novak
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TLV431: Unclear value reference current
Part Number:TLV431
Hi all,
I'm doing a theoretical voltage accuracy analysis on TLV431 Low-Voltage Adjustable Precision Shunt Regulator with Vka > Vref and I found some specifications in the datasheet, which don't make sense to me. Basically I try to find a minimum reference current for the TLV431 to work fine.
My circuit looks similar to fig. 23 given in the datasheet:
The datasheet can be found at: www.ti.com/.../slvs139x.pdf
On page 4 under 6.1 (Absolute Maximum Ratings) it says that the reference current (Iref) has to be between -0.05mA and 3mA.
The following page (5) indicates ,under specified test conditions, at 6.5 (Electrical Characteristics for TLV431)
which is fine.
Then, on page 17 in section 8.3 (Feature Description) it is written, that the reference pin needs at least 0.5µA to work proper.
Now to my question: Does this mean, that the minimum working current is 0.5µA as stated in 8.3 and the values for the test conditions do not apply to my circuit (Vka > Vref)? Or can the device work with reference currents below 0.5 µA in my circuit as well?
Furthermore I'm getting confused with the negative minimum current as shown in 6.1. If there would be a negative current, my reference voltage would get falsified since the current generates an voltage over R2. Anyway a negative current out of an npn base doesn't make sense to me under this circumstances and would cause the device to not work as desired.
Any help on this would be appreciated.
PS: Throughout my investigations I noticed the same thing for the TL431 device, which works in a similar way with different reference voltage.
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TPS27S100: TPS1H100B vs TPS27S100B
Part Number:TPS27S100
Doing a production run with the TPS1H100B and it's gone heavily out of stock. Distributor is referring to the TPS27S100B as being a direct alternative.
Do you have any documentation which states the differences between these devices, and/or are they drop-in-replacements for each other?
thanks,
Mat
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TPS92518HV-Q1: excel spreadsheet calculator for this part
Part Number:TPS92518HV-Q1
How do you request access to the excel spreadsheet calculator for this part ?
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CSD87355Q5D: CSD87355Q5D VGS question
Part Number:CSD87355Q5D
CSD87355Q5D VGS question :
CTMR like to ues CSD87355Q5D for Half bridge power stage and H/L side driver voltage is 12V, But CSD87355Q5D recommond driver reange is 4.5~8V, please helo offer suggest to slove this Issue.
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TPS54233: Delay start-up using EN of TPS54233
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BQ40Z50-R1: Unexpected results of Chemistry ID matching tool/failure of learning cycle
Part Number:BQ40Z50-R1
I have completed a full ChemID Cycle (partial charge, relax, discharge, relax), following the instructions in http://www.ti.com/lit/an/slva725a/slva725a.pdf. The only deviations from the instructions were that the relax periods were significantly longer than 2hr post charge and 5hrs post discharge specified (battery left to relax overnight).
The log file from this that I submitted to GPCCHEM was:
/cfs-file/__key/communityserver-discussions-components-files/196/8546.chem_5F00_id_5F00_testing.zip
and the report received:
As you can see in the report, the recommended ChemID is 1582. As shown in the screen cap from bqStudio below, this is listed as a 1920mAh model. I do not have the exact chemistry of the cell under test, but I do know it is ~5400mAh, which is significantly different. Does the difference in capacity matter for Chemistry ID? Should I disregard the result and try again, or trust the matching tool?!
I ask because when subsequently running a learning cycle the learning cycled failed during the discharge stage with RDIS and NSFM bits set. From /cfs-file/__key/communityserver-discussions-components-files/196/0020.7418.Achieving-The-Successful-Learning-Cycle.pdf, common failure number 6 states
Which I would not expect as I have just applied the ChemID matched by GPCCHEM. I have confirmed that the ChemID was applied correctly with SMBus command 0x6, and I reset the bq40z50-R1 prior to starting the learning cycle to ensure the update was 'applied'.
My questions are:
- Is the matched Chemistry ID implausible given the large difference in capacity between the cell under test and the model listed in the chemistry database?
- If so, can you see what in the submitted log file is causing the problem and how I might fix this?
- If not, what else can I try to successfully complete a learning cycle?
- How could I verify that I have an appropriate Chemistry ID, other than by running a learning cycle and not getting RDIS set?
Thanks,
Hamish
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