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BQ25960: General questions for an specific application

Antonio López
Prodigy 70 points
Part Number: BQ25960
Other Parts Discussed in Thread: BQSTUDIO, , EV2400, USB2ANY, BQ25713

Tool/software:

Hi,

My name is Antonio López, and I have many questions to know if this product is suitable for my project.

  • I know that I can monitoring the temperature, battery voltage, and current with the ADC. Can I monitoring these data in real time? If not, which is the period of time to do it?
  • Can I program it with a specific voltage an current with the I2C protocol to charge the battery ? For example 4.2 V 8A or 3.8 V 4A.
  • Do you recommend before make my own PCB buy the EVM model to test it?
  • I know that there's a program to see the registers and programe the IC (BQSTUDIO) but can I use an micrcontroller to comunicate with the BQ?
  • I have the symbol and the footprint, but not the model to do a simulation, is it possible to simulate in a specific software?I'm using Proteus.

Best regard,

Antonio

  • 0
    Prodigy 70 points

    Another question:

    Can I program the charging mode? For example, only Constant Current or only Constant Voltage. Is the profile of charging always like is ploted in the datasheet or I can modify these modes?

    The last one, why is necessary a main charge in standalone mode like  bq2589x or bq2561x, for doing this kind of chraging modes.

  • +1 in reply to Antonio López
    TI__Expert 8000 points

    Hello Antonio,

    Antonio López said:
    I know that I can monitoring the temperature, battery voltage, and current with the ADC. Can I monitoring these data in real time? If not, which is the period of time to do it?

    Yes, the bq25960 has an integrated ADC that can measure bus voltage, bus current, battery voltage, battery current and more. Refer to section 9.3.9 "Integrated 16-Bit ADC for Monitoring and Smart Adapter Feedback" of the bq25960 datasheet for more information regarding the ADC. The sample speed of the ADC can be adjusted by way of adjusting the precision of the conversion (11-bit, 13-bit, 14-bit, 15-bit resolution). A higher resolution generally means more time for each conversion as more bits need to be processed. The ADC must be enabled through the ADC_EN bit, otherwise it is disabled to conserve power.

    Antonio López said:
    Can I program it with a specific voltage an current with the I2C protocol to charge the battery ? For example 4.2 V 8A or 3.8 V 4A.

    No, the switched capacitor battery chargers do not regulate charge current like many of our other chargers (i.e., there is no register to set the charge current to 500 mA, for example). This is due to the unique nature of the switched cap topology, where charge current is a function of several factors, such input and output voltage, and series impedance.

    Antonio López said:
    Do you recommend before make my own PCB buy the EVM model to test it?

    Yes, purchasing an EVM is recommended for evaluating the performance of the bq25960 and ensuring that it meets your requirements. We have a User Guide available on the BQ25960 product page which you can follow for quick setup and evaluation. You can also test your code with the EVM. If you are considering purchasing an EVM and would like to use bqStudio, then it is recommended to consider purchasing an EV2400 as well for interfacing your PC with the EVM.

    Antonio López said:
    I know that there's a program to see the registers and programe the IC (BQSTUDIO) but can I use an micrcontroller to comunicate with the BQ?

    A microcontroller can be used to communicate directly with the bq25960 using I2C. Typically, bqStudio is used with our EVMs which interface to your PC using our USB-based interface boards, USB2ANY or EV2400. Using a microcontroller to communicate directly with bqStudio would require bridging the microcontroller to the PC running bqStudio.

    Antonio López said:
    I have the symbol and the footprint, but not the model to do a simulation, is it possible to simulate in a specific software?I'm using Proteus.

    Unfortunately, we do not provide a specific SPICE model for bq25960.

    Antonio López said:
    Can I program the charging mode? For example, only Constant Current or only Constant Voltage. Is the profile of charging always like is ploted in the datasheet or I can modify these modes?

    No, the charging modes (CC or CV) are not present for this converter and charge current depends on several factors, such as input and output voltage, and series impedance. Generally, for the same battery voltage, a higher input voltage will yield a higher charge current.

    Antonio López said:
    The last one, why is necessary a main charge in standalone mode like  bq2589x or bq2561x, for doing this kind of chraging modes.

    Using bq25960 with a main charger gives the lowest power loss across the full charging cycle. A main charger, such as bq2561x or bq2589x, is recommended for handling the trickle charge, precharge and charge termination stages of the charging profile, while bq25960 is better suited for fast charge. Also, a main charger can handle a system load which bq25960 cannot do.


    Regards,

    Alec Lehman

  • 0 in reply to Alec Lehman
    Prodigy 70 points

    Okay, thank you so much Alec. My conclusion is that this IC is not going to work in my project.

    I need one IC that charge from the voltage range 3.5 V (or lower) up to 4.7V (or 5V), and a charge current from 100 mA (or lower) to 6A or more, this parameters all of them regulated with registers, comunicating with I2C or similar. My batteries are cilindric 1S like Samsung inr21700-50e, this one is Li-Ion but I want that admits LiFePO4 too.

    In addition, that the charge curve do like bq25960 with the Constant Current charging and when the limit voltage is reached change to the Constant voltage. I was looking for different IC and the bq25960 was so good but I need tho configure the charge current. Also, if it's possible that measure the voltage, current and temperature when is charging. Do you have any idea with another IC or combining two of them to have these configuration that I mentioned to you?

    Best regards,

    Antonio López

  • 0 in reply to Antonio López
    Prodigy 70 points

    Maybe the BQ25713 can work?

  • +1 in reply to Antonio López
    TI__Expert 8000 points

    Hello Antonio,

    I recommend that you visit our battery charger IC parametric part search page, where you can filter through our catalog of parts by the specifications you have provided. Here is a link to the page:

    https://www.ti.com/battery-management/charger-ics/products.html

    We have several parts which support both Li-Ion and LiFePO4 cell chemistries, the full CC-CV charge cycle, charge current regulation, and an integrated ADC.

    Regards,

    Alec Lehman