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BQ40Z50: BQ40Z50 EVM and BQ24610EVM

Bang Duong
Prodigy 100 points
Part Number: BQ40Z50
Other Parts Discussed in Thread: BQ24610EVM, BQ24610, , BQSTUDIO, EV2400

Hi guys,

I use BQ40Z50EVM for Battery Management and BQ24610EVM for battery chargers. The diagram connection is like an attachment fig1.

As I measured, the Battery does not charge when the AC/DC Adapter is plugged in, the voltage output at the J5 connector is 12.6V but the voltage at the Battery is still 12.25V (the battery voltage before plugged in).
When I connect only the battery with BQ24610EVM like in Fig, don't use BQ40Z50EVM, BQ24610 is running normally, I can unplug the AC/DC adapter, and the voltage at the SYS connector is 12.25V - which means the battery can open to discharge.
When I unplugged the AC/DC adapter, the voltage SYS in BQ24610EVM was ~0V, which means the battery could not open the discharge.

When I measured only BQ40Z50EVM, no voltage output at J4 pin Pack+, which meant I could not open the battery for charge or discharge.

Can I use BQ40Z50 together with BQ24610?

Also, I attached the schematic when I use BQ40Z50 and BQ24610, Can you take a look to help me resolve this problem?

  • 0 in reply to Bang Duong
    TI__Mastermind 24906 points

    Hello Bang Duong,

    All the gauge does is allow charge and discharge through the high side protection FETs. Please make sure of the following.

    1- Make sure the FETs are ON. CHG and DSG bits should be red (if using BQStudio) in Operation Status A.

    You can also check the PACK+ voltage without the charger attached. It should be nearly at the same voltage level as BAT+ when FETs are ON. 

    2- Make sure the BAT pin of the charger is connected to PACK+ of the gauge EVM.

    Note: If any protections or permanent failures triggered, this can avoid charge/discharge current.  This is on the gauge side. 

    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    Prodigy 100 points

    Hello Jose,

    Thank you for your help.

    1. I have not connected the SMB bus to read the register so I can't check with BQStudio. The voltage PACK+ without the charger attached is ~ 0V, which means FET is close.

    2. I'm sure that I connect correctly. 

    I can not open Fet on BQ40Z50 for a charge or discharge test and still don't know why.

    Hope you reply me soon!.

  • 0 in reply to Bang Duong
    TI__Mastermind 24906 points

    Hello Bang Duong,

    1- You will need to communicate to the gauge to send the FET_EN command. You will not be able to charge/discharge until the FETs are ON.

    Please see below the current path (green). If FETs are closed, the current path is broken.



    If you have an EV2400, you can use BQStudio to easy talk to the device. I highly suggest you use BQStudio for testing purposes. 

    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    Prodigy 100 points

    Hi Jose, 

    1- You will need to communicate to the gauge to send the FET_EN command. You will not be able to charge/discharge until the FETs are ON.

    => If I do not communicate to the gauge to send the FET_EN command, I ‘m not able to charge/discharge the battery. 

    How Can I do without communicate to gauge to send the FET_EN command when the first time power up this board. Which mean I do not have MCU power up yet. 

    I use BQ24610 and Bq40z50 for this reason, when pluggin ac/dc adapter, ac/dc will charge battery and the system. When ac/dc disconnect, battery auto supply the system. First time power up, without communicate, I can not use battery with BQ24610. 

    Hope you reply to me soon,

    Bang Duong

  • +1 in reply to Bang Duong
    TI__Mastermind 24906 points

    Hello Bang Duong,

    If the BQ40z50 has not been flashed/programmed before, it will boot up with default settings. The default settings have the FETs off. Once you write to flash by sending FET_EN command, you will not need to do this again. This is a one time process.

    In the same note, once you obtain a golden image, this will contain the setting and configurations needed for proper gauging. It will have the FETs ON and controlled by the FW. See the Start Guide below for more details in CHEMID and Golden Image.

    Our gauges have procedures. If you have not obtained a matching ChemID and done a learning cycle, we do not suggest you move forward. 

    Please reference to our Start Guide for BQ Products.

    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    Prodigy 100 points

    Hi Jose,

    It's nice to only need to flash one time.

    Thank you very much.

    Bang Duong