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BQ78350-R1A: Differences between chip versions BQ78350-R1, BQ78350-R1A and BQ78350-R2.

Alexey Trubachev
Intellectual 520 points
Part Number: BQ78350-R1A
Other Parts Discussed in Thread: BQ78350-R1, , BQSTUDIO, BQ78350

Hello friends. Currently, the TI website has a description of the chips 

BQ78350-R1 and Technical Reference to it SLUUBD3E (September 2015–Revised January 2020) https://www.ti.com/lit/ug/sluubd3e/sluubd3e.pdf

BQ78350-R1A and Technical Reference SLUUC78 (December 2019) https://www.ti.com/lit/ug/sluuc78/sluuc78.pdf

Also on the site is the firmware version BQ78350-R2. 

Tell us briefly what is the difference between these versions of chips, which firmware version is the most recent and preferred, and when will the Reference Manual to the R2 firmware version be released? 

  • 0
    TI__Guru* 81034 points

    Hi Alexey,

    Here is a quick description for each device:

    BQ78350-R1: This is the main device that has been in production for a few years and is the one used by most users.

    BQ78350-R1A: This is functionally identical to the R1 device. It comes pre-loaded with the latest R1 firmware (v1.04). The only difference is an improvement in the robustness of the Shutdown routine (for users that use the Shutdown command in their application). This will be fully released in the next few days. I recommend this device if you are thinking of using the R1.

    BQ78350-R2: This is a firmware only download. It is similar to the R1, but it has some new features that are outlined in this document: http://www.ti.com/lit/pdf/sluubm6. The biggest feature difference is the addition of a pre-discharge function. Many users also find the IPScale feature very nice for high-current applications, but current scaling is still possible with the R1 device by running the calibration with a scaled current. There is no dedicated TRM for the R2 device, so the user must rely on the R1 TRM along with the Addendum document. BQStudio can be referenced for all of the data flash addresses using the Advanced view in the Data Memory screen.

    I hope this helps,

    Matt

  • 0 in reply to Matt Sunna
    Intellectual 520 points

    Hi Matt, thanks for the response. We use 78350R1 chips and install R2 firmware. We use the IPSCALE function, since the currents in our batteries reach 200-400 amperes, and we find this function very convenient. I would like to see chips like BQ78350\BQ769x0 with the Impedance Track algorithm, since it does not require such a large number of logs to calculate the CEDV coefficients.

  • 0 in reply to Matt Sunna
    Prodigy 55 points

    Thanks for this information. Is there any plan to release a device that is already shipped with -R2 Firmware on it?

  • 0 in reply to Michele Blank
    TI__Guru* 81034 points

    Hi Michele,

    There is currently no plan to create a device shipped with R2 firmware. This may be considered at some point in the future if there is strong demand.

    Regards,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 55 points

    Matt Sunna said:

    There is currently no plan to create a device shipped with R2 firmware. This may be considered at some point in the future if there is strong demand.

    Thanks Matt.

    [My previos question which was here before the edit could be solved.]

  • 0 in reply to Michele Blank
    TI__Guru* 81034 points

    Hi Michele, 

    The firmware updater tool I just sent is one convenient option. Many users write their own production code for loading the firmware and running calibration, so I sent you a basic example for writing the srec to the device.

    Best regards,

    Matt