Hi,
I am wondering about the SRX pin connection for this chip. Correct me if I am wrong but the battery+ terminal is connected to the BAT pin and passes through the integrated current shunt resistor to the SRX pin. This means that our new system voltage is now supplied by the SRX pin instead of directly from the the Battery+ terminal before we incorporated the fuel gauge into our design.
Thanks for your help,
Adrian
I'm not using the TS, HDQ and RA0 pins on the BQ27742-Q1 fuel gauge so I'm wondering what should I do with those pins. Should I leave them unconnected, or it would better to pull them to ground?
Thanks
Hi All,
What is the 2015 situation re EV2300 on Win7 64-bit? I've tried all software and suggestions in the old posts,, but still get 'The EV2300 connection could not be initiated' And had first-ever blue screen on Win7 when I plugged the EV2300 it into the USB port for the first time (no EV board was connected) - hope its not dead.....
Many thanks in advance
K
SLUC138CR.zip package contains a list of chemistry IDs and a change list.
In the selection table, the NCR18650B (Panasonic) has ID=0210.
In change list, it has 2 entries: ID=2012 and ID=2017
Which one is right (or best)?
Thanks,
Hi all,
Using GaugeStudio 1.4.1. I am able to communicate with the bq27530EVM. Now I'd like to use the "Calibration" function.
Thanks for any help
MH
BqStudio reads 5100mV min cell voltage for each cell, -128 min temp and 127 max temp in lifetime data collection.
This certainly never happened.
All other data is 0.
I sent the LT_RESET command lots of time and reset the IC but I keep on reading 5100mV, -128 and 127.
I also tried enabling LT before sending the LT_RESET.
The IC has never been sealed. I also sent out commands to unseal just to make sure.
What's happening?
Thanks
In "Simple Guide to CEDV Data Collection for Gauging Parameter Calculator (GPC)" it is written in section 2.2:
" An easy recording method utilizes TI's bqStudio software utility called GPC Packager that reads data
directly from a TI fuel-gauge."
GPC packager, it asks for log files to build a package. I can't find any way to record a discharge cycle in that pane.
I can display a a data graph with BqStudio but I can't find a way to save the recording anywhere.
What's the trick?
Thanks
We are using the bq76920 to help with battery monitoring in a circuit. Sporadically, when reading the CC_CFG register it will be 0x00 instead of 0x19. We program the 0x19 at startup (per the datasheet) and periodically during operation. However sometimes when we read the current value from the CC, it reads wrong (about 2.5 times too large). In that case the CC_CFG register is 0x00. I have two questions:
- Would the CC_CFG value not being 0x19 cause this size of an error?
- Is there a mechanism that would clear the CC_CFG register internally to the IC? We have not found an instance of overwriting the CC_CFG register to 0x00, but will keep searching until we hear back on this.
Thanks,
Dave Brobst
I am working on an application with the bq2060A gas gauge IC. When I poll the battery status (SMBus command code 0x16) I continually receive a message with the "Unknown Error" bit flagged. Are there additional memory addresses in RAM outside of those listed in the datasheet that can be accessed to debug this error? The datasheet only lists RAM addresses from 0x00 to 0x3f corresponding to the SMBus command codes, but some of the application documentation references RAM access beyond these points (i.e. the offset values when loaded from EEPROM into RAM).
Thanks.
I have noticed frequent SMBus clock stretching by the BQ78350 when there is a load connected to the battery.
It also happens when there is no load or charging but that much less frequent.
We periodically send out a bunch of SMBus requests (23 at each 500ms) and we are almost never able to complete all the requests in that 500ms when in discharge. Even with 1 second period, it fails every 10 seconds or so.
It does not look to be the same command every time that leads to a clock stretching.
Do you have hint as to which SMBus commands have an increased latency when discharging? Or maybe that's something else?
Regards,
Hi
In my project am using 3.7V (2100mAh) Battery, here i want to indicate the battery current level, and how many hours it standby. is their any ic their please refer me
I have a guy designing a PCB now for the BQ76920& BQ78350 combo and I have a few questions I need to get answered.
#1. Is high side switching required if I want to be able to still communicate with the fuel gauge after it has cut the power off due to low voltage or short circuit conditions? These systems will be monitored remotely so ideally I need my micro controller to still be able to pull data from the fuel gauge even during a shut down condition.
#2. I'm using large high current FET's that will require a external gate driver since the chip does not provide enough power to drive it.
I'm using these FET's http://www.digikey.com/product-detail/en/IXTN600N04T2/IXTN600N04T2-ND/2354478
I plan on using up to 2 of these FET's on the Charge & Discharge paths on our high current applications but not over 250-300A in either direction. So I'm having the board designed to be able to handle up to 2 of these FET's on the Charge And Discharge paths to allow me to use 2 FET's when needed. Most of the time I will only need to use 1 FET on the Charge & Discharge Paths.
Here are the questions my PCB designer has about adding FET drivers to handle these larger FET's.
IXYS makes also FET driver ICs. But I have no clue yet which can be
used to drive the FETs and were to take power from. Maybe direct from
the battery but not sure how to set this up without a risk of
permanently draining the battery.
#3. Due to the high current nature of our applications 100-300 amps I'm having these larger IXTN FET's placed on a heat sink really close to the BMS PCB, I plan to use a 3 inch wire go from the custom PCB charge & discharge gate solder pads to the gate driver connection on the IXTN FET's. Is there any problem with doing this? I can't mount these FET's on the PCB, they have to be mounted on a heat sink.
#4. I plan to also run a 3 inch wire from the Rsense solder pads on the custom PCB to a high current shunt like this:
I can't easily run 300 amps though a PCB so I figure running the Rsense wires from solder pads on the custom PCB to screw terminals on both sides of the shunt should work just fine. Is my assumption correct?
hi,
today i tried to set cell balance e.g. CELLBAL1 set to 0x03, CELLBAL2 and CELLBAL3 set to 0, on monitoring these cell voltage i don't see voltage drop across these cells, because the DEVICE_XREADY flag is 1 ?
cheers,
Tiger
Hello Battery Management Community:
I’m using and studying the bq34z110EVM board with bqEVSW. I followed the “Design Steps” and ran a complete cycle.
Later, I was going to modify a parameter in data flash, input a new value, pressed the enter, but the parameter changed back to the previous value and the Input field turned red. Following pictures:
step1: 
step3: 
I’m sure that the device was not set to be sealed. What can cause this issue?
Currently using a Ti evaluation board Bq40Z60EVM-578 integrated with Li Ion Battery cells in a 3S 3P configuration and bq studio.
Trying to verify correct operation of under voltage protection feature. Settings, Protection, Enabled protections A = ff. Protections threshold = 3500mv.
Fets do not turn off when battery voltage falls below this threshold and battery continues to discharge. Any other parameters that must be set to perform this function?
What is the best source of information to identify the connection between the bq studio settings and chip functionality beside the Tech ref manual?
We are planning to use bq34zq110 to gauge the following batteries:
1. N70T
2. C12-105DA
3. C12-120DA
www.centurybatteries.com.au/.../specification-sheets
Would you please let me know if Ti has Chemistry ID for these battery.
Thanks and best regards,
Andy
Hi,
We have the BQ20Z655R1 - Battery Management IC and use the 5 segment bargraph lcd to display the state of charge. Single bar corresponds to 20% of the fuel gauge.
The fuel gauge is beetween %0 and %20, 1th segment is enabled, the others are disabled as it should.
The fuel gauge is beetween %21 and %40, 1th and 2nd segment are enabled, the others are disabled as it should.
The fuel gauge is beetween %41 and %60, 1th, 2nd and 3th segments are enabled, the others are disabled as it should.
The fuel gauge is beetween %81and %100, all of the segments are enabled as is should.
But when the fuel gauge is between 61% and 80%, 5th segment is enabled too. It should be disabled. We use typical LCD implementation with 330k pull up resistor in the BQ20Z655-R1 datasheet of TI.
Best Regards,
Thank you for your help in advance.
John.
i am planning to use bq40z60 in my battery charger design. i wanted to know the changes that are to be done for 3 cell battery.
Hello.
Background:
I am using the BQ27421-G1 for a system-side battery gas gauge which will connect to removable battery packs.
Question:
1) When I switch battery packs, how does the gauge accurately measure the state of health?
2) Does it take a full discharge cycle or some amount of time?
3) I can plug a 100 mOhm resistor in series with the battery pack to simulate aging and the state of health does not change more than just a few percentage points, is there a more appropriate value to use, or does it take a specified amount of time to update this value? We saw about a full discharge cycle to drop 2-3%
