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BQ24770: Battery life cycle testing

Ved Soni
Intellectual 530 points
Part Number: BQ24770
Other Parts Discussed in Thread: BQ25606, BQSTUDIO, EV2400,

I am designing a test setup for  performing life cycle tests on 3500 mAh batteries. For these I need a battery charger to charge it, an electronic load to discharge it and I'm considering using a fuel gauge to measure the battery voltage and current to obtain the capacity. So, I'll just keep replacing sample batteries once they are tested with new ones. These batteries are not installed inside any device such as laptop/cell phone during testing. So I have several questions pertaining to various components which will be used in the test setup.I could find answers to these questions on different threads, but I've not yet finalized all the parts which will go into my setup and hence, I'm posting this just to ensure that the answers I receive will be more general and also I could save time in the process:

BQ2477x Battery Charger:
1) BQ2477x has BQstudio support, right? So do I specify the charge voltage, charge current and the charge termination current via BQstudio interface? If not, what is the process to do so? I've read up datasheets of your standalone devices such as BQ25606, wherein these parameters are defined by formulae. However, I couldn't find such formulae defining the battery charge parameters in BQ2477x's datasheet.

Fuel Gauges:
1) I read up about pack and system fuel gauges. Would it make any difference to my application whether I use either of the two configurations? 
2) I'm interested in TI's Impedance track fuel gauges. Do these gauges provide the battery impedance data? What other data do they provide other than the battery voltage, current and temperature? Can we graph the SOC and capacity curves by integrating these fuel gauges with BQstudio?
3) Does TI offer fuel gauges to monitor batteries having capacity lesser than 100 mAh?
4) What is the external capacity indication feature in fuel gauges? I saw a bunch of options such as LED/LCD/SOC; how do each of these work?
5) Is the current measurement option available on all the TI fuel gauges or only those with an integrated sense resistor?

EV2400
1) I'm thinking of using a SMBus battery charger and I2C fuel gauge (or vice versa) and connect them to an EV2400 and hook it up to a PC. After doing this, will I able to program both these devices via BQstudio?

MISCELLANEOUS:
1) Does TI manufacture DC electronic loads? If yes, do they have BQstudio support?
2) Does TI make Relays which can be controlled by BQstudio?
3) I'm interested in automating the battery testing setup. TI products which I mentioned, do not have LabVIEW support, right? So are these devices supported on simulink, via which I could automate them? And if they do have Simulink support, would I need to use BQStudio to program the system?
Thanks in advance!
  • 0
    TI__Guru**** 169756 points
    Hi Ved,

    Regarding the bq24770, the bq24770 is supported by BQSTUDIO. Its charge voltage and charge current are configured in SMBus registers.

    Regarding EV2400, yes, the EV2400 is compatible with BQSTUDIO.

    Regarding Miscellaneous 1, no.
    Regarding Miscellaneous 2, no.
    Regarding Miscellaneous 3, no however, keep in mind that the BQSTUDIO interface for the charger is only doing individual SMBus register reads and writes. The charger's state machine then makes decisions based on the values in those registers. Any host software capable of SMBus communication can do the same.

    I do not support the fuel gauges so I will forward this question to the fuel gauge team. The fuel gauges are processor based and therefore need BQSTUDIO or significant coding for full operation.
  • 0 in reply to Jeff F
    Intellectual 530 points
    Thanks for the reply, Jeff! So what I am gathering is, there isn't a way of automating this battery life cycle setup via BQstudio, LabVIEW or Simulink. So are there other products chargers/ gauges manufactured by TI which can be incorporated in this setup and which could help me automate it?
  • 0 in reply to Ved Soni
    TI__Guru**** 169756 points

    Ved,

    I am not aware of any such off the shelf product. I forwarded to my coworkers on the gauge team and they are not aware either.

  • 0 in reply to Jeff F
    TI__Guru**** 169756 points
    Since I haven't heard back from you, I am closing this thread. If you have more questions, please submit a new thread.