bq27421 and bq27621
HII am short listing for a battery gauge to be used in a wearable product.The size of the battery is in the range of 150mAH to 250mAH.Would like to find out the main differences between these two...
View Articlebq76PL536EVM-3 / SDO_H output voltage
Hello,I have the question about SDO_H output of bq76PL536EVM-3.Please see the attached file as SPI I/F waveform of bq76PL536EVM-3.(Please visit the site to view this file) In this file , there are two...
View ArticleLost communications with bq20z95
Hello,In an effort to produce a Golden Pack, I performed a calibration and two learning cycles with a BMS based on the bq20z95. When I went to write a fresh .senc file (described in section 2.1 of...
View ArticleDifficulties producing a credible golden pack (bq20z80a-v110). Qmax updates...
We have been unsuccessful creating a credible producing a golden pack from which to create a golden image file. The hangup occurs during the battery learning cycles. Qmax values update and the CF bit...
View ArticleLifetime Data
Hi All,Is there a way to reset the Lifetime data as the pack is deployed? Otherwise the high currents, etc. during testing will be recorded forever and lower currents in the field will not be...
View ArticleBQ20z65 what subclass is Max Capacity Err in?
I'm using an ENCR file for the BQ20z65 that allows me to access three hidden registers in the Gas Gauging page of dataflash: OCV Wait Time, DOD Capacity Err and Max Capacity Err. I need to write those...
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bq20z75 sleep mode issue
Just as the SLUU265A technical reference manual statement, when we need to get the CHG FET off and DSG FET off in sleep mode.but we found that the CHG FET and DSG FET are still powered on (Vgs=10V of...
View Articlebq34z100 unsealing issues
Good morning,recently I had to unseal some battery packs for changing some configuration parameters and I followed the standard procedure I found in a post (I haven't changed any default access...
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BQ76PL536A-Q1 heavy noise on data lines to host
Hello,in our application we have a 144s2p battery which is diveded in two seperate 72s2p stacks which are connected in series. Each stack is supervised by 12 bq76pl536A-Q1 (So one BQ76 supervises one...
View ArticleBQ77908A Not Tripping into Batteries
I have three Batteries, two are in parallel at a lower SOC. When I connect the third battery the other two impose 700A for 800ms. My OC Discharge is set to 600A at 400ms, but the battery doesn't trip....
View ArticleBQ34Z100 strange behavior when reading registers
I'm trying to read some data from a battery pack we get already assembled and configured from a supplier.I know it's a BQ34Z100 inside and amongst others I read the SOC/SOH-Registers from adr 0x02/0x03...
View Articlebq20z75-v180 update status 0x0A
My customer confirmed that update status of bq20z75-v180 became 0x0A after learning cycle.Normally update status becomes 0x06.What does 0x0A mean?
View Articlebq27500 Golden Image Programming
Hi all,I've got a bq27500-v130 designed into a product. I've already gone and generated my golden image file by calibrating 20-30 boards, averaging values, and using bqEASY. However, my question is...
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BQ77910A Balancing LiFePO4 High Current Voltage Tolerance
We have been doing a lot of testing on the cell balancing function of the BQ77910A. I find that during most of the charge, since we are using LiFePO4 cell the variation from the highest cell to the...
View ArticleAvailability of BQ30Z554-R1
I am working on a new design, and my purchasing department is having trouble acquiring the BQ30Z554-R1 in either tube or T&R.Is this because the device is new to the market, or just because of low...
View ArticleBQ77PL900: Reading BAT voltage and discharge current on Vout/Iout in...
Is it possible to read the BAT voltage and current during discharge in stand-alone mode?I have enabled the BAT, IAEN and VAEN bits in the FUNCTION_CONTROL register 0x03 via I2C.It appears that there is...
View ArticleBQ34Z100 SOC and remaining capacity always at 0
Hello, I try to use the BQ34Z100 with battery 3S6P (Sanyo Lithium ion battery UF553450Z). With the bq Evaluation software, i set parameters "flash data" following application notes. Sometimes...
View ArticleMultiple energy sources to charge power single battery
I am trying to harvest energy from 2 energy sources ( Vout adjustable from 3 to 5V) to power a single battery (3.6V Li-Ion/ NiMH). I want to be able to draw power from both even if one sources output...
View ArticleGeneral question about Fuel Gauge
Hello,I have a general question about Fuel Gauge ICs. I looking for solution for Li-Ion battery capacitance measurement, to use for wireless transceiver application. I just interested about Fuel Gauge...
View ArticleProgramming the bq2084 data flash
HiI have a problem writing to the internal data flash of the bq2084.I'm using the I2C interface of an AT90CAN128 AVR to do it.I'm able to do a block read of 16 bytes with commands 0x60 onwards. The...
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