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BQ40Z50EVM-561: BQ40Z50EVM-561 & BQ25672EVM

MOUSTAFA MOHAMED
Prodigy 10 points
Part Number: BQ40Z50EVM-561
Other Parts Discussed in Thread: BQ40Z50, BQ25672EVM, BQ25672, EV2400, BQ25798, BQ25710

Tool/software:

Hello, 

we are working on a Battery Management System to be set up in  our Robots and Smart home devices to be designed with these specifications:

  • -1 to 4 S 18650 Lithium Ion Batteries (each cell capacity is 1500mAH).
  • -Has dual power input: Solar input/MPPT, USB C/PD Charger support.
  • -Cell Battery Pack Manager and Protection.
  • -Battery Monitoring - Fuel gauge to monitor the health and the remaining capacity percentage.
  • -The Fuel gauge IC and the charger should be communicated with each other to charge and maintain the battery health.
  • -The MCU should communicate with both the Fuel gauge and the charger IC to monitor the current state ( charging, discharging). Also, monitor the battery health and the remaining capacity percentage.

From that point, we make an initial selection as Following:

  1. BQ40Z50EVM-561 to be used to understand the concept of the Fuel gauge IC BQ40Z50.
  2. BQ25672EVM  to be used to understand the concept of the charger  IC  BQ25672.
  3. EV2400 evaluation kit to set up the required parameter from the PC.

"Kindly note that we decide first to use a dev kit from the recommended ICs to be familiar with them then we will design our PCBs based on the ICs we used in the dev kits" 

So, we need an assist to ensure that this selection is suitable for our applications and the devkits also.

 

  • 0
    TI__Mastermind 28490 points

    Hello,

    I believe that the bq40z50 is the correct choice for this application. I will loop in someone from the charger team to confirm the choice for the charger.

    Regards,

    Anthony Baldino

  • 0 in reply to Anthony
    Prodigy 10 points

    Hello Anthony,

    Thanks for your dedicated effort. Can we replace the charger  IC  BQ25672?

    As it only supports I2C communication then the fuel gauge IC will not be able to communicate with it as it requires SMbus communication.  

    Can you recommend a different Charger IC with its evaluation kit which has all the specifications I mentioned above?

  • 0 in reply to MOUSTAFA MOHAMED
    TI__Intellectual 2010 points

    Hi Moustafa,

    Nice to meet you. I am a marketing engineer in the charger team.

    For the charger, I would recommend BQ25798 which is the buck-boost version of BQ25672.  Buck-boost is needed for USB-C PD since the negotiated Vin from the USB-C port could be above or below the battery voltage.

    I also would recommend sticking with I2C in order to communicate with the PD controller. Please take a look at this reference design that contains an EVM that has a TI PD controller + BQ25798: www.ti.com/.../USB-PD-CHG-EVM-01

    Regards,

    Charles

  • 0 in reply to Charles Harthan
    Prodigy 10 points

    Hello Charles,

    Nice to meet you too, 

    What about BQ25710 it supports SMBus Communication so it can send/receive commands to the Fuel gage Ic and acts as a smart charger. But it doesn't support dual input and I am not sure that it supports MPPT/solar input it is mentioned in the website description However there is no section indicating that function in the IC datasheet.

    Regards,

    Moustafa

  • 0 in reply to MOUSTAFA MOHAMED
    TI__Intellectual 2010 points

    Hi Moustafa,

    That is correct. BQ25710 does not have the same MPPT functionality that's on BQ25798. I will correct that on the website.

    Do you have an MCU in your system? I have seen many customers use SMBus to communicate from the MCU to the gauge and then use I2C to communicate with the MCU to the charger.  If this is acceptable for you, i think BQ25798 best meets your requirements.

    Regards,

    Charles

  • 0 in reply to Charles Harthan
    Prodigy 10 points

    Hello Charles,

    Thanks for your reply, 

    Yes, I have MCUs in my applications but they are different. In some applications, the main and only MCU is ESP32 other STM32F407, and other ROCK chip microprocessors.

    In this case, when choosing  BQ25798 do you recommend choosing an additional low-power MCU that can handle the power management, Charger IC communications, and Fuel gage IC monitoring?

    Or I can handle all of these things with the main MCU which supports two I2C peripherals. one for the SMBUS fuel gage and the other for the I2C charger IC?

    Regards,

    Moustafa

  • 0 in reply to MOUSTAFA MOHAMED
    TI__Intellectual 2010 points

    Hi Moustafa,

    If you have enough connections on your main MCU, you could use the main MCU to control the charger and gauge to simplify your design.

    Regards,

    Charles