BQ20Z65-R1_BQEVSW-SW: The BQ20Z655 chip does not display any information on the bqCHEM page after being connected to the communication

Hi Li Li

Can You send me the software BQ20Z655  to my email ?

email - beniu33@gmx.de

Thank You

What's the exact FW version for your bq20z655?

BQ20Z655-R1 V0.03

I would also like to ask whether BQ20Z655 requires electrical learning to calculate accurate SOC like BQ40Z50. Thank you!

The bq20z655 runs the same basic algorithm (different version) as the bq40z50 and will adapt over time by tracking cell resistance and chemical capacity, improving SOC accuracy over time.

That is to say, BQ20Z655 still needs to go through electrical learning.

What is the reason for the blank bqCHEM page?

I would also like to ask you, when I calibrate the battery pack and test the discharge overcurrent protection, the charge and discharge MOS will turn off by itself, and when the protection is restored, it will not turn on, what is the reason for this?

Could you provide a document with detailed steps for BQ20Z655 to learn electricity？

The gauge doesn't need to go through "electrical" learning. The algorithm will adapt automatically. It's possible to accelerate this with a "learning cycle". See https://www.ti.com/lit/pdf/slua848 for details.

The protection will be restored according to the flow chart and rules from chapter 2.2.2 Charge and Discharge Overcurrent, www.ti.com/.../sluu493a.pdf

That means the battery doesn't need to learn to charge, and it doesn't need to match a chemical ID, right?

I have found a version of the host computer that can display the bqCHEM page, but the chemical ID inside is not the one I want (Samsung, INR18650-35E). Can you provide an installation package with the latest chemical ID? Thank you!

You can download it from: https://tidrive.ext.ti.com/u/9b7o2h4-6MXnvujJ/0dec9de2-e4d1-4b24-87e8-dac3bfeadb6d?l

Access code: QFhUJ1#3

As shown in the figure, I set the protection thresholds of AOCD and SC, but the protection was not carried out during my test. The MOS tube would not operate, and I could not detect the faults of AOCD and SC.

I need the chemical ID of SDI INR18650-35E. The software you sent me does not contain the ID of this cell, but the chemical ID of this cell is in BQ40Z50. How should I import this chemical ID into BQEVSW? Or do you have the latest ID firmware that can be imported into the bqEVSW software, which contains INR18650-35E. Thank you!

Please download the chemistry update from: www.ti.com/.../GASGAUGECHEM-SW

Why not let the download?Can you provide the documents to me directly?Thank you!

As shown in the figure, after calibration, my current is -4mA. According to the manual, when sending a command to enter shutdown mode, the current needs to be equal to 0 to enter shutdown mode. Then, does my battery fail to enter shutdown mode when sending a command? If so, what is the solution to getting the battery into shutdown mode?

Please set the current deadband to 5mA, which will over-ride the -4mA current and this should allow entering shutdown mode.

I don't know why this was rejected. I cannot over-rule this on E2E. Do you have a local TI contact?

Would you like to ask, BQ20Z655 does not have the function of low temperature discharge protection?

Does BQ20Z655 have low discharge and low charge protection?

The bq20z655 doesn't have low temperature discharge protection.

No.

May I ask, BQ20Z655 power learning, Updata Status becomes 0x06, this is the learning success? Do I need to continue charging and discharging so that Updata Status becomes 0E?

0x06 indicates success. 0x0E indicates that additional learning happened *after* a learning cycle.

OK,Thank you!

As shown in the figure, there is another problem: my impedance meter, R_a0 is successfully updated to 0055, but R_a0x is not successfully updated, and it is still FFFF. Will it affect the SOC accuracy?

Can BQ20Z655 be configured with the function that does not allow discharge under the condition of cell temperature below -20 ° C?

No. The bq40z50 has this feature.

No. The second table is used to minimize flash wear and the gauge will automatically update it when necessary.

BQ20Z655 Why manually change CycleCount to 0, MaxError will become greater than 100%, what is the reason? Is there anything else that needs to be changed?

BQ20Z655 When I set the CELL_TAPER bit to 1, where should I set the cell's Blow-off Voltage so that the SOC can become 0%? Is it Term Voltage? But I see that the Term Voltage is the cut-off voltage of the entire PACK rather than the cut-off voltage of the cell.

MaxError just gives you an indication that it's time to run a charge/discharge scenario (not a dedicated learning cycle) which allows the gauge to update cell resistance and chemical capacity. If you set cycle count to 0, it means, by definition, that the gauge hasn't "updated" anything as there was no cycle if this is zero.

BQ20Z655 ,When I set the CELL_TAPER bit to 1, where should I set the cell's Blow-off Voltage so that the SOC can become 0%? Is it Term Voltage? But I see that the Term Voltage is the cut-off voltage of the entire PACK rather than the cut-off voltage of the cell.

Hello, please help answer this question, thank you!

CELL_TAPER refers to the charging voltage. The gauge will divide the charging voltage by the number of series cells, if this is set.

There are various "term" voltages. The one for 0% is Terminate Voltage and this is on the pack level.

Does BQ20Z655 have instructions to clear LifetimeData data?

May I ask if BQ20Z655 has a LifeTimeReset clearing instruction similar to the red box in the picture of BQ40Z50? Thank you!

There is no command to accomplish this. You can directly write to LT data if you unseal the gauge and reset it that way.

BQ20Z655 chip battery pack cannot enter Shutdown in SEAL mode. What happened? No response after sending the 0010 command twice?