EM1402EVM: BQ76PL455A-Q1: BQ76PL455Q1EVM GUI for EM1402EVM

Hi Vince,

Thanks for the quick response.

Please find my comments.

1. I have installed the cable drivers for the FTDI cable. but problem is still not resolved. As per some suggestion, i have uninstalled and Re installed drivers. but no use.Is there any solution to resolve this? 

2. OK

3.OK

4. I am using 16 cells only. I am using  12 Volts external power supply. Is it ok for this application or Do i need 12 Volta Aux battery?

Thanks & Regards,

Malli

Hi Malli,

Thank you for your responses!

For the first question, let's see if we can debug this a bit. Can you try another USB port on the computer to plug the cable into? Some USB ports cannot supply sufficient power (even though it should be only a small amount of power). It may be helpful to try a different type of USB port on the computer too (if it is not working with a USB 3.0 port, try a USB 2.0 port, and vice versa). If another USB port does not work, do you happen to have an BQ76PL455EVM device on hand to make sure the cable works with that device?

For the 4th question, we do not officially support anything that is not a real 12 volt auxiliary battery. While the power supply may work, we cannot officially provide any support for the device if it is not used as specified in the EM1402EVM user guide (linked in previous post).

Let me know if the cable works with a different USB port.

Regards,

Vince

Hi Vince,

I have checked the power supply coming from USB and  its showed 5V. Is n't it Sufficient? and I have only one USB cable.It will take time to get another cable.

Regards,

Malli

Hi Malli,

I am sorry for the confusion. My suggestion is actually to try a different USB port on the PC. You can use the same cable, just plug it into a different location on your PC. For example, if you used the left side of your laptop, try plugging it into the right side of your laptop

Kind Regards,

Vince

Hi Vince,

Thanks for the clarification.

For your information, i already tried with different USB ports and with different PC's. But same error is coming..

Thanks,

Malli

Hi Malli,

Can you confirm that you have the switches below set correctly for single-ended?

Regards,

Vince

Hi Malli,

Do you still need help with this issue? If so, please see Vince's question in previous post.

Regards,

Leslie

Hi Vince and Taylor,

Thanks for your support.

I am able to resolve the above FTDI Drivers issue.

But i am facing other issue.

In GUI, It is showing balancing is happening, but actually my all cell voltages are same for infinite time.

I tried to change  the EMB_Vset value with different values from 0 to 10 but no use.

kindly suggest.

Thanks,

Malli

Malli,

How big is your cells?

" cell voltages are same for infinite time "

Can you give us detail?

Provide cell voltage, current and time?

Roger

Hi Roger,

My cells are Cylindrical cells and around 2.6 Ah.

I am using the software code as it is(downloaded from TI website(TMS570BMS). i did not change a single word in the code. just i changed the EMB_Vset(0,2) to EMB_Vset (0,5) with different variants.

My GUI showing Active Cell Balance is Active i mean showing the green colour beside the cells which are choosen for Active balancing.

I am attaching Screen shot here,

Hi

I haven given only one minute data.

but it is happening even for 2-3 hours.

and i checked VIO, DAC out put, VP

these values are showing VIO=3.3V , VP=5V, and DAC out put=1.28V

NOTE: Tell me if i want to change anything in code and where to change and  why?

Waiting for your valuable suggestion

Thanks,

Malli.

Hi Malli,

Can you please clarify what you mean by "In GUI, it is showing balancing is happening"?

The GUI can only be used to monitor the cell voltages. The balancing functions in the GUI cannot be used to control the active cell balancing devices (EMB1428/EMB1499). You need the microcontroller to do that. 

Regards,

Leslie 

Hi Leslie,

I am using microcontroller also.

In Gui, there a BALANCE tab, from there I clicked cells balance. It is showing green color , but actually no current is flowing in the hardware.

Hi Lesli,

 We have TMS570 micro controller and bq76PL455-GUI. GUI is able to communicate to PC through micro controller. We can monitor the cell. We are using a sample code(CCS project) from TI available at

http://www.ti.com/tool/TIDM-TMS570BMS.

We can't use debugger mode and communication with bq76PL455 at the same time. There are function which enable the PL455 and other function which actually start the cell balancing.

 In GUI everything is seems to be working fine but when we connect the multi-meter to measure the cell balance current, it always measure zero current. Also there is no fluctuating voltages as shown in user manual one cell balancing is ON.

 Please refer my earlier mail for more details and pictures.

Thanks,

Malli

Hi Malli,

"
I am using the software code as it is(downloaded from TI website(TMS570BMS). i did not change a single word in the code. just i changed the EMB_Vset(0,2) to EMB_Vset (0,5) with different variants.

"

Would you be able to change the above value (EMB_Vset) back to the default as well, so that it is 1-to-1 identical to the original sample code? I believe modifying this may cause issues with the current sample code.

Regards,

Vince

Hi Vince,

I changed to Default value EMB_Vset (0,2) but nothing is happening.

What is the next option now?

Thanks,

Malli

HI Malli,

I saw this on one of your previous posts:

"In Gui, there a BALANCE tab, from there I clicked cells balance. It is showing green color , but actually no current is flowing in the hardware."

Just to be clear: the BALANCE tab in the GUI does not control the active cell balance devices (EMB1428 and EMB1499). That tab is to control the passive cell balancing on the BQ76PL455A device which you are not using. If you are enabling cell balancing from that tab you won't see balancing on the active cell balancing devices. Please use the GUI only to monitor the cells. All actions and commands to the EMB devices come from the microcontroller.

I suggest you check the response from the EMB1428 device to the MCU when you send commands (through SPI). You should get information on what error is happening to know if the switches are closing and if the EMB1499 is charging/discharging.

If after trying these debug steps you still have questions  can you please go ahead and create a new thread?

Best regards,

Leslie