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bq27541-G1 communication via BQSTUDIO and EV2400

Randy King
Prodigy 70 points
Other Parts Discussed in Thread: BQSTUDIO, BQ27541, EV2400, BQ27541-G1

Can I use an EV2400 and BQSTUDIO to communicate via HDQ with a bq27541 that is integrated in a battery pack?

If so, how?

If not, what do I need to do so?

  • 0
    Prodigy 220 points
    yes, You can, I've successfully tested HDQ with the EV2400 ;-), here is how to do it:
    0) be sure that You can access the HDQ- Pin of the Pack PCB ( you need to "see" 3 wires VAccu/HDQ/GND at least)
    1) be sure the firmware of the EV2400 is 0.18+
    2) be sure that the HDQ- Pin has a PullUp ( probably already existent on the Pack PCB )
    3) be sure the BQ27451-G1 runs in HDQ- Mode (Note: default is I2C !)
    3) connect the EV2400- PORT3- Line VSS to PackGnd and the EV2400- PORT3- Line SDA to the HDQ- Pin of the Pack PCB
    4) run BqStudio ( will itself detect that HDQ is enabled )
  • 0
    Genius 3970 points

    Hi Randy, welcome to the forums!


    Yes, you can use the EV2400 and bqSTUDIO to interface with TI gauges that use the HDQ interface (I have done so plenty of times). Just connect the HDQ and ground pins from the battery pack to the EV2400. As long as the protection circuitry in the battery pack hasn't been tripped (perhaps from over-discharge), you should be able to communicate with the pack. That said, the HDQ interface is pretty slow (7 kilobits per second), so you may notice that the software takes a while to update the Registers and Data Memory panels.

    On that note, what sort of battery pack are you trying to interface with?

  • 0 in reply to Enrico Guenther
    Prodigy 70 points
    Hi Enrico,

    Thank you for your reply. I don't see "VAccu," but it looks like (based on step "connect...") I don't need it.
  • 0 in reply to Jason Gin
    Prodigy 70 points
    Hi Jason,

    Thank you for your reply. It’s great to know that I can use the EV2400 for HDQ communications, even though the EV2400 documentation says that it’s not supported.
    I am interfacing with a rechargeable Li-Ion, 1S1P battery pack that is designed for Datalogic by an ODM.
  • 0 in reply to Randy King
    Genius 3970 points

    Hi Randy,

    The EV2400 has technically supported HDQ for quite a while, but the reason it's listed as being unsupported is because it's a bit unstable. The newest firmware has improved its performance, but it's still a little inconsistent in terms of connection reliability; the older EV2300 adapter has more stable HDQ support but has only unofficial driver support in 64-bit versions of Windows.

    If you haven't grabbed the latest firmware update for the EV2400, you can download it here (SLUC578).

    Regards,
    Jason

  • 0 in reply to Jason Gin
    Prodigy 70 points

    Hi Jason,

    I set up bqstudio on my PC, upgraded EV2400 to v0.18 firmware and connected EV2400 port #3 to HDQ and Batt- on my battery pack.  bqstudio now communicates with the battery (bq27541-G1), but I don’t know how to use bqstudio and the help files are very terse. 

    Questions:

    1. What do I need to know to do something useful with bqstudio?
    2. Where can I get more information about how to use bqstudio?
    3. Do I need any other hardware or software for battery pack evaluation?

    Randy