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BQ2970: How to program fault threshol

Vedashree Varra
Intellectual 300 points
Part Number: BQ2970

Hi,

I am using BQ29707DSET in my application. In the datasheet it is mentioned that we can program fault detection threshold. It is shown below;

I cannot seem to find how to program them since there is no communication interface to the IC.

Please help on how to configure the threshold to the requirement.

Thank you,

Vedashree

  • 0
    TI__Expert 8451 points

    Hi Vedashree,

    The BQ270 is only factory programmable.  You will not be able to program the device in the field.

    To meet your system needs, please select a device that has the features you desire from the Section 5 Device Comparison Table.  This can be found in the BQ2970 datasheet, which I will link here: BQ297xx Cost-Effective Voltage and Current Protection Integrated Circuit for Single-Cell Li-Ion and Li-Polymer Batteries datasheet (Rev. H).

    Best,

    Andria

  • 0 in reply to Andria McIntyre
    Intellectual 300 points

    Thank you for the information. 

    I have a doubt regarding the parameters given in Section 5 Device comparison table.

    In the above table Charging overcurrent detection voltage(OCC), Discharging over-current detection voltage(OCD), Short circuit detection voltage(SCD) are mentioned for concerned part number of the device.

    I want to know what these voltage represent, like the current threshold at which these function. Do you know where they are specified or how to calculate the current at which protection circuit is enabled?

    Thank you,

    Vedashree

  • 0 in reply to Vedashree Varra
    TI__Expert 8451 points

    Hi Vedashree,

    Section 9.2 Functional Block Diagram in the datasheet shows the internal layout of the BQ2970, and the following sections (9.3, 9.4, etc.) in the datasheet describe how these functional blocks are used for device operation.  The link to the datasheet can be found in my previous post.

    Essentially, the BQ2970 is able to use voltage for current protections thanks to Ohms law: V = iR.  Given a measured voltage and a known resistance, you can determine current.  Section 10.2.2 Detailed Design Procedure has more information about component values.

    Best,

    Andria