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SMBus single Cell Fuel Gauge?

Antenna_Head
Genius 12840 points
Other Parts Discussed in Thread: BQ2060A, BQ40Z50, BQ2060

Team-

After reviewing the selection guide, it appears that we do not have an SMBus compatible fuel gauge for single-cell (1S1P) applications- please confirm this.

The only device that will come up under a search is the 'PL114, but this is a powerLAN device, and not intended to operate stand alone.

Please let us know what is the best TI solution for an SMBus Fuel gauge capable of monitoring a single cel.

Thanks!

Steven Dunbar, AFA Colorado

  • 0
    TI__Intellectual 940 points

    Hello Steven,

    The bq2060A can operate with a single lithium-ion or lithium-polymer cell and is SMBus 1.1 compliant.  It is not an impedance-track gauge, but is a very good coulometric gauge.  It will operated down to a Vcc of 2.7V.  It's best if the design has some type of detector that will shut down the Vcc to the gauge if the battery voltage is so low that it cannot sustain a Vcc of greater than 2.7V.  The VFC tends to act up and start counting charge if Vcc drops below 2.7V and the Vpor threshold is enough lower (~1.9V), that it's worthwhile to prevent the gauge from seeing a Vcc that lingers in this uncertainty range.

    Bill

  • 0
    TI__Genius 14985 points

    How SMBus compliant does the customer need the gauge to be?  The electrical signaling of our gauges using I2C should work on an SMBus, although the command set will be different.  If they need strict SMBus compliance then Bill's suggestion of bq2060A is their only choice.

  • 0 in reply to Bill J10799
    Intellectual 855 points

    Dear Sir,

    Can I use bq2060A for gas guaging of 1S1P Li-Ion cell  with 10A capacity and SMBus 1.1 compliant?

    I find it support only 2, 3 and 4 Cell in the datasheet. If bq2060A can operate with a 1S1P, please share the ref. circuit to support my customer. If not, what is the right solution for this application? My customer's requirements are

    a) 1S1P Li-Ion Cell

    b) Capacity : 10000mAh

    c) control : SMBus 1.1 not I2C.

    Thanks

  • 0 in reply to avraka
    Genius 3970 points

    Hi Avraka,


    TI's line of gas gauges has changed since the last time this particular thread was updated. TI's latest gauge, the bq40z50, is a fully SBS-compliant 1-4S fuel gauge. Unlike the bq2060, the bq40z50 uses TI's Impedance Track algorithm, which makes for a very accurate gas gauge.

    I think there are other SMBus single-cell gauges being developed but nothing official from TI has come out yet.