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BQ27621-G1: About Accuracy of the battery fuel gauge ICs

Egemen Aksoy
Intellectual 925 points
Part Number: BQ27621-G1

Tool/software:

Hello,

In our sensor node project we shall use 3.6V Li-Ion battery pack which can be reach 17500mAh capacity. So we decided to use BQ27621-G1 as a battery fuel gauge IC. (For maximum capacity and compact design at the PCB side)

Since BQ27621-G1 has no Impedance Track feature I am wondering what is the accuracy of BQ27621-G1? Is the Impedance Track feature strongly recommended?

What shall be the main difference between Dynamic Voltage Correlation and Impedance Track ?

Best regards,

Egemen Aksoy

  • 0
    TI__Mastermind 28480 points

    Hi Egemen,

    It is difficult to give an exact measurement of the accuracy difference between Impedance Track and Dynamic Voltage Correlation since it depends on the application, however Impedance Track tends to be much more accurate. The Impedance Track Algorithm takes aspects from Voltage Correlation and Coulomb Counting for its calculations, while the Dynamic Voltage Correlation does not include Coulomb Counting. More information about Impedance Track can be found in the document below:

    https://www.ti.com/lit/pdf/slua364

    Regards,

    Anthony Baldino