Battery Management - Gas Gauge Forum - Recent Threads

how can I read data from bq34z100 I2C_write,I2C_read ?

Shin Do Heoyng — Fri, 22 Mar 2013 04:40:39 GMT

Hi

Question:

Average current value of BQ34z100 from I2C - 1 byte data reads
Iteupnida very well.

CURRENT: 0x0018 -> olryeogo to read the current value

Returns the instantaneous current measured by the gauge

Source program I2CCOMMAND (); Public get down Where Have
Questions Olympique stuffy feeling.
To a communication control microcomputer ATMEGA 128 reads the instantaneous value of current
Control () Subcommand address 0018 Read (); value 0xffff comes.
Dream, please let me know how to get favor.

Thank you very much.

Example 1:

/ / ------------------------------------------------ -----
/ / Pack_Voltage Reading
/ / ------------------------------------------------ -----
I2C_start ();
I2C_write (0xaa);
I2C_write (0x08);

I2C_start ();
I2C_write (0xab);
vt_l = I2C_read (1);
I2C_stop ();

I2C_start ();
I2C_write (0xaa);
I2C_write (0x09);

I2C_start ();
I2C_write (0xab);
vt_h = I2C_read (1);
I2C_stop ();

Tx_Pack [0] = vt_h;
Tx_Pack [1] = vt_l;

/ ------------------------------------------------ -----
/ / Pack_Current Reading
/ / ------------------------------------------------ -----
// Current 0x0018 Read 0X0000 ----- ?

I2C_start ();
I2C_write (0xaa);
I2C_write (0x00);
I2C_write (0x18); / / current
I2C_stop ();

I2C_start ();
I2C_write (0xaa);
I2C_write (0x01);
I2C_write (0x00);

I2C_stop ();

I2C_start ();
I2C_write (0xaa);
I2C_write (0x00);
I2C_write (0xab);
I2C_write (0x00);
ac_l = I2C_read (1); --> Not Read_Data ?
I2C_stop ();

I2C_start ();
I2C_write (0xaa);
I2C_write (0x01);
I2C_write (0xab);
I2C_write (0x18);
ac_h = I2C_read (1); --> Not Read_Data ?
I2C_stop ();

bq27510 data flash writing

Carlo Vanoni — Mon, 20 May 2013 15:44:05 GMT

Hi,

I'm trying to configure the bq27510 Gas Gauge without using the user interface, since I don't expose the SDA/SCL pins.

I've read the datasheet and various threads on this forum, but I still have problems with the write process.

As an example, I try to change the Op Config register from 0x0979 to 0x0978. My I2C routines use as parameters: the component 7-bit address, an address/data buffer, the number of bytes to write/read

// Write BlockDataControl

off[0] = 0x60; off[1] = 0x00;

I2CWrite(0x55, off, 2); WaitDelay();

// Write DataFlashClass

off[0] = 0x3E; off[1] = 0x40;

I2CWrite(0x55, off, 2); WaitDelay();

// Write DataFlashBlock

off[0] = 0x3F; off[1] = 0x00;

I2CWrite(0x55, off, 2); WaitDelay();

// Write new data

off[0] = 0x41; off[1] = 0x78;

I2CWrite(0x55, off, 2); WaitDelay();

// Calculate checksum

off[0] = 0x60;

I2CWrite(0x55, off, 1);

I2CRead(0x55, &checksum, 1);

checksum -= 0xFF;

checksum = 0x79 - checksum; // convert old value...

checksum += 0x78; // ...with new value

checksum = 0xFF - checksum;

// Write checksum

off[0] = 0x60; off[1] = checksum;

I2CWrite(0x55, off, 2); WaitDelay();

That's all.

....and it doesn't work! The value will never be updated.

Am I missing something?

Also, reading the control status like this

// Calculate checksum

off[0] = 0x00; off[1] = 0x00; off[2] = 0x00;

I2CWrite(0x55, off, 3);

I2CRead(0x55, status, 2);

I get a status 0x0400 or 0x0004 (I don't remember the correct one. By the way, both values state that the device is not in sealed mode)

VEN duty cycle on bq34z100

Robert Hoyt1 — Mon, 20 May 2013 15:15:45 GMT

I want to know what the duty cycle is for teh VEN pin on the bq34z100. I'm using the VEN pin to gate the BAT signal. This is a multi cell application and I am using a voltage divider. I want to know what the current draw will be, so I will calculate it as DutyCycle(VEN)*V(PACK)/R(DIVIDER)

How to turn off OVER LOAD function about bq29312a?

KIM DOSOEK — Mon, 20 May 2013 06:17:24 GMT

hi. I'm KIM

I have a question about bq29312a.

I 'm using bq2084+bq29312a chipset. But I don't want to use DISCHARGE OVER LOAD function of bq29312a. Is it possible to turn off with bq29312a?

The below data is about 29312a. I believe OV function off if 'XOL' bit is changed from low to high. Unfortunately, I can't find to change this bit.

please advise to me.

thanks.

BQ34Z100 new chemical ID?

Sergey Gnatenko — Mon, 20 May 2013 13:40:14 GMT

Dear Sirs!

Currently I am working with the evaluation module BQ34Z100EVM and EV2300.

IFR 32650, 12V, 20Ah, LiFePO4, 3-cell battery pack of OPTIMUM BATTERY CO., LTD manufacture is applied. The board is set and calibrated correctly. According to SLUA334B the Chem ID must be determined before the microchip learning. To do this, I took off voltage, current and temperature data during the battery charge and discharge. To calculate the Chem ID I used only discharge data. Then I substituted the data in the following Mathcad files: chemselect_cont2.mcd, chemselect_rev32.xmcd, chemselect_cont_rev35_mcd11.xmcd, but did not manage to get the Chem ID values. Probably, it is necessary to create a new Chem ID for this battery.

What should I do in this situation? Can I create a new Chem ID or this must be done only by your specialists?

With Best Regards,

Sergey

Generating and using .bqfs and .dffs files for BQ27410 fuel gauge

Kishan Illur — Mon, 20 May 2013 07:21:16 GMT

Hi,

We have used BQ27410 fuel gauge in our design. We have generated .dfi image using BQEasy. Now we are trying to flash it to our chip using host processor. As i understand, for that I need to generate .dffs and .bqfs files using TI's FlashStream tool which is not publicly available. Could someone from TI please send me the FlashStream tool and related documentation. I also request for any example code that can be used to read these files and program fuel gauge chip.

Thanks

BQ3055 data flash access

Harini Sekar1 — Mon, 20 May 2013 06:02:59 GMT

Hi,

I am having trouble accessing the data flash. Datasheet says it can be accessed by writing the row offset to 'manufacture access' and reading the entire row of 32 bytes from 'manufacture input'. But it doesn't specify the variable offsets and row offsets. How to access the different variables in the data flash of BQ3055? Is there a document specifying the row and variable offsets?

flashstream and dfi

Joe Reagan — Fri, 01 Apr 2011 13:33:37 GMT

Hello,

Like others in this forum, i need help with programming our gas gauge (BQ27500-v130) for production. Could someone send me the latest version of flashstream and any

code (preferrably in C) and documentation which implements this?

Thank You,

Joe

Writing DFI File at production.

Jose14510 — Wed, 24 Nov 2010 13:21:39 GMT

Hi,

I have a bq27510 EVM and an MSP430 microcontroller connected via I2C. I have succesfully communicated to the gauge and have read values such as control status, flags, temperature, voltage, etc.

On the other side, I have generated a DFI file for the cells I'm planning to use using the appropriate app note (slua449d)

Right now, I'm trying to write the DFI file via I2C. I have already managed to upload the data to the microcontroller, so now I have to reproduce the flowcharts on figures 8, 9 and 10 of slua449d.

The thing is, this flowcharts are a rather large sequence of undocummented commands for erasing and writing the data flash (this is called "ROM mode" in the datasheet). I'd like to know if is there any other tool to help code and debug the DFI write process, such as:

- Code samples

- Explanations of what do these commands mean, or what outcome should be expected of them

- Sequence of command types to generate a read the golden pack info stored in the gauge. this might be a intermediate step and also could give final verification of uploaded data

Any of these would be really appreciated.

Thanks in advance!

Jose

bq26200

Tanvi Verma — Sat, 18 May 2013 06:04:36 GMT

Dear sir

i am working on Bq2019 and want to replace it with the BQ-26200 can you tell how to calculate the value of Rom and Ram file?

Regards

Tanvi Verma

Battery Low% in Bq3060

santosh bangaru — Mon, 13 May 2013 12:44:02 GMT

Hello,

Please explain me what is the importance of Battery Low% in bq3060. Why DOD at EDV2 should be initialized to (1-Battery_low%)*16384.

Regards

Santosh

need help in usage of bq3060 with BqEASY

santosh bangaru — Thu, 09 May 2013 13:40:29 GMT

Hello,

We are using LiFePo4(6.6V,9.6Ah) battery pack in 2s3p configuration with BMS IC (bq3060) inside it purchased from a vendor. we need to check the battery performance with BqEASY,we have done cheking for charging/dischrging performance.it is not reaching the values mentioned in datasheet. we have not done any dataflash changes when we have got from vendor. these problem are due to data flash uneven data according to the pack?

Is it neccessary to have any files to make bqEASY work proper with this chemistry.

Many Thanks

Santosh

BQ20Z75 Remaining Capacity, Remaining time to Empaty and Battery Voltage Relation

Jayesh Prajapati — Tue, 12 Feb 2013 01:31:54 GMT

Hi All

I have very specific question Regarding BQ20Z75 Battery Management IC.

Required Battery Pack Term Volatge is 7V. Which I have set in Term Voltage register.But when I discharged my battery using constant current source at 800mA, Battery capacity and remaining time to empaty shows 0 at around 7.269V. But battery volatge doesnt go down to 7V. Battery cell cuts off itself. I can not understand why battery capacity, remaining time to empaty and Battery voltage doesnt match with each other?

CAn someone please explain how Battery Volatge,Remaining Capacity and Remaining Time corelates with each other.

Load Mode 1

Load Select 3

Any help will be much appriciated.

Regards Jayesh Prajapati

Not getting correct values in battery capacity fields

Perry Frogge — Sat, 18 May 2013 16:06:06 GMT

Using a primary 9.6V battery, I believe i have set all necessary values, and calibrated, how can it see 100% SOC and it only thinks I have 1maH of capacity when i connect the battery? I load the battery with 100mA and in 5 minutes the gauge drops to 0%, even though voltage is still 9.2v

bq27510 and GaugeStudio

G L — Tue, 14 May 2013 14:48:08 GMT

The bq27510 is connected to a battery and I can see its being accessed via GaugeStudio, But it seems that Gauge Studio can’t connect to it completely (see attached picture).

As you can see, it detects the EV2400 connected to the bq27510EVM and successfully reads the voltage (4.186V) and temperature. However, I can’t access any registers. Looking at the quickstart guide, I can see that it should find the exact device which in my case is bq27510. Is gauge studio expected to work with this device or do I have to use the older bqEASY software? Perhaps my actual IC doesn't have the right device type.

BQ78412 unable to update values

Bjoern Urbanek — Thu, 09 May 2013 12:46:28 GMT

Hello!

We have a BQ78412 and we want to update some parameters of the board. (e.g. voltage gain) We using the bq784xx Evaluation Interface software (V1.2.0.0.) and connecting via USB to the board. Reading is successful, but we are not able to change some parameters. If we enter a new value it will be reset to the old one.

Currently the voltage gain values seems to be invalid ( 0 ).

How we can correct this value / update the values.

many thanks.

Bjoern

How to exit ROM mode on BQ20x655-R1

Christopher — Fri, 17 May 2013 18:00:17 GMT

What is the proper way to exit ROM mode on this device?

I can enter ROM mode. (enter 0x0F00 as a 2 word command on the SBS page)

I can then download the .senc file. (Flash Memory-> Read to File)

After that the part is unresponsive to other SBus commands. All attempts to communicate get the error "SMB Write Command Error Error Code No Acknowledge: VB_T2H_NACK"

I can re-write the DFI file to recover the device. Does that overwrite calibration and other pack data such as cycle count and min/max voltages?

BQ27425 Files and clarification

Colton Murphy — Fri, 17 May 2013 19:14:23 GMT

Hello:

I've been searching the forums for more information on our particular situation.

Essentially, we want to be able to upgrade the BQ27425G1 chips we have to BQ27425G2 versions. For this we need a .senc file I believe. Where is the .senc file for the G2 revision? For the BQ27520, the firmware files are posted in the respective pages on the TI website for each revision. Why is this not the same?

I am fairly confused with the half a dozen or more different programming files for these chips: DFS, DFFS, BQFS, DMI, SENC, DFI. I mean... what the? Can someone give me the low down all on these formats and what they apply to?

It is my understanding that these chips are essentially microcontrollers with embedded firmware that can be updated. Within each chip number, there is a revision added to the end: G1, G2, etc.. To go from G1 to G2 for example, is only a firmware update. So there are two programming sections on each of these chips. Data flash, or program memory, and then EEPROM. EEPROM is where all the "user programmable" parameters for the gauge reside, such as termination voltage, etc.. Is my understanding correct?

Back to firmware programming. The end goal is to not use a TI tool to do our firmware image programming, but our own in circuit methods. After looking at the flashstream tool, it seems this will take a .senc file and convert it into a bqfs and dfi file, which are ascii commands. A PC program can parse the commands and literally just send out the commands over the I2C bus to update the firmware in the chip. Again.. is my understanding correct?

Any help is appreciated: Thanks

BQ3060 Design Voltage cannot be set lower than 7000mV?

Ryan Mowry — Thu, 16 May 2013 21:45:04 GMT

I am trying to use a BQ3060 to monitor a 2s LiFePO4 pack. The BQ3060 seems to work well, except I cannot set the design voltage to 6.6V to reflect the voltage of my pack. Is there anything that can be done so that we can read the correct SBS Design Voltage? Does this value affect anything relating to CEDV? Is it just to tell the system the voltage that the pack was designed for?

bq30z50 / bq30z55 and Evaluation Software

Vladimir5 — Thu, 16 Aug 2012 09:11:07 GMT

Hi.

Where can I download the bq30z50-R1/bq30z55-R1 Gas Gauge Evaluation Software ?

bq77910A polling question

Joseph Perino1 — Wed, 15 May 2013 18:02:29 GMT

We have prototyped and are considering a stacked 77910A solution to provide protection for a 16s design. The 16s battery pack in the end application can also be in parallel with other 16s battery packs. Our customer would like to be able to periodically retrieve safety information, using a host microprocessor, from each of the 16s packs in parallel.

We understand that it is not recommended to poll the status register during normal operation of the devices; however, we would like to consider a scenario in which it might be feasible to periodically (twice an hour, twice a day?) drive ZEDE to allow the host micro to read the fault status register. Can someone outline risks and potential issues associated with reading the status register during operation? False safety events? Loss of protection during polling? Polling the register after a suspected safety event has occurred? Loss of safety information during the register read? And what is the minimum time required to retrieve data from the safety status register? I have reviewed various threads and understand various issues related to noise, etc. but would like to try to understand better. I do not want to post additional details regarding our application in the forum, so would be OK taking the conversation offline.

Thanks,

Joe Perino

Nova Battery Systems

bq20z90 4s2p to 4s3p Reconfiguration Assistance

Tyler Pate — Mon, 22 Aug 2011 15:23:58 GMT

Greetings,

We have a customer who has a working implementation of a 4s2p w/ no LEDs using bq20z90, and is looking to create a new design with a 4s3p w/ 4 LED indicators. The hardware side of the problem has been solved, the customer is seeking assistance reconfiguring the software to meet these updated requirements.

Is there a document available that could help guide through the process? Any other resources (phone, internet, etc.) that could help in this case?

Thanks,

Tyler

follow up to LiMNO2 support for bq34z100

Perry Frogge — Thu, 09 May 2013 20:22:18 GMT

Any word as to if this update will be out this year?

Thanks

Perry

""""""""""""""""""""""

Timothy,

We do not currently have a gauge that can support LiMNO2 accurately. We are working on a new algorithm to support this chemistry, but it will not be available until late 2013. It will be developed on the bq34z100 platform.

Best regards

Tom Cosby

bq77908a min voltage on EEPROM pin

Robert Hoyt1 — Thu, 16 May 2013 17:07:42 GMT

I didnt find in then spec the min voltage for programming the EEPROM. I saw in the application diagram that they are expecting 14V and the pin max is 15, but what's the min voltage for writing EEPROM?

Perform Open Circuit Voltage Reading -- bq20z65

Dylan Temples — Thu, 16 May 2013 12:54:48 GMT

Hello!

In the documentation, it says that in order to update QMAX and reduce the max error, we need to perform two open circuit voltage readings. There is no documentation on how this should be performed though (ie, are we taking the readings and then inputting the value somewhere? Is the BQ software taking the reading? If so, how do we set it to perform this reading?). Does anyone have any information on how we should proceed? (By the way, the reason we need to update QMAX is to clear the CF bit so we can perform the learning cycles on our batteries)

Thanks!
Kat