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BQ76952: Development roadmap for Bq76952 firmware

Harry McNally
Intellectual 440 points
Part Number: BQ76952
Other Parts Discussed in Thread: BQ40Z50

We are designing for the BQ76952 and wondered if the part has functionality to achieve Impedance Tracking and other features of parts like BQ40z50 (we already use) in a future firmware upgrade ?

Is this possible or is the digital core hard-coded in this device ?

If not possible, is there likely to be a 3S to 16S device with Impedance Tracking in the development roadmap ?

  • 0
    TI__Prodigy 250 points

    Hi Harry,

    At this time, we don't have the ability to achieve impedance track with the BQ76952. This device does not have flash, and therefore cannot be re-programmed by the customer. We also don't have any active plans to implement a 3-16S device with impedance track integrated in the immediate future.

    Thanks,

    Sid

  • 0 in reply to Siddharth Sundar
    Intellectual 440 points

    Thank you for the feedback Siddharth.

    We are now considering if we can put an MCU in front of the BQ76952 and need to work out if it exposes enough sensing so we can do some impedance tracking-like compensation to calculate SOC.

    But the new question that we have is whether TI's market research indicates low customer interest to impedance tracking for higher series (16S) packs ? Is linear SOC and predictive end-of-charge only important for 4S packs in portable equipment where run-time is more critical ?

    If so, we may be over-thinking (and over-designing).

    All the best
    Harry

  • 0 in reply to Harry McNally
    TI__Prodigy 250 points

    Hi Harry,

    Unfortunately, we don't have much exposure to how exactly our customers implement gauging functionality.

    I can say that BQ76952, with its high accuracy voltage measurements, coulomb counting, and simultaneous V/I measurements exposes the data you need to do high quality, accurate gauging.

    Thanks,

    Sid

  • +1 in reply to Siddharth Sundar
    Intellectual 440 points

    Thank you Sid. We will keep evaluating the BQ76952.