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BQ2085-V1P3: Read AFE Status (bq29311) with bq2083 Evaluation Software

Klaus
Expert 1337 points
Part Number: BQ2085-V1P3
Other Parts Discussed in Thread: BQ29311, BQ2085

Hi Ti Experts,

we are using the bq2085 with the AFE bq29311 in a 3S1P application.

Is there a opportunity to read out the AFE Status (bq29311) with the bq Evaluation Software in the Pro Screen:)

In the datasheet of the bq29311 I found this:

I want to read out the value via this screen:

Thanks for helping us.

Klaus

  • 0
    TI__Guru 57697 points

    Hello Klaus,

    The bq29311 AFE is read by bq2085. It is not available to read directly. I searched the bq2085 datasheet and there does not appear to be any command to read the AFE_STATUS.

  • 0 in reply to Shirish
    TI__Guru 57697 points

    Hello Klaus,

    The bq29311 has an I2C interface and the bq Evaluation software has a SMBus Pro Screen. There is an inherent incompatibility.

  • 0 in reply to Shirish
    Expert 1337 points

    Hi Shirish,

    thanks for your answer.

    I don't want to read directly the bq29311. I want to read it "through" the bq2085.

    I think the bqEvaluation Software is able to read the AFE_Status, because I think the following data should be out of the bq29311, isn't it?

    How does the bqEvaluationSoftware get this data?

    Thanks.

    Klaus

  • +1 in reply to Klaus
    TI__Guru 57697 points

    Hello Klaus,

    The bq2085 AFE Status register can be read using ManufacturerData() command with Read SMBus Block

    The ManufacturerData( ) (0x23) Description: This function allows access to the manufacturer data contained in the battery (data). The bq2085−V1P3 stores seven critical operating parameters in this data area. Purpose: The ManufacturerData( ) function may be used to access the manufacturer’s data area. The data fields of this command reflect the programming of eight critical data flash locations and can be used to facilitate evaluation of the bq2085−V1P3 under various programming sets. The ManufacturerData( ) function returns the following information in order: Pack Configuration, Gauge Configuration, Misc Configuration, Digital Filter, Self Discharge Rate, Pack Load Estimate, Battery Low%, and Near Full (2 bytes) AFE Status, and the pending EDV threshold voltage (low byte and high byte). SMBus protocol: Read block Output: Block data—data that reflects data flash programming as assigned by the manufacturer with maximum length of 13 characters (12 + length byte).

  • 0 in reply to Shirish
    Expert 1337 points

    Hi Shirish,

    it works. Thanks.

    I have made three tests:

    I have overlooked this section in the datasheet.

    Thanks.

    Klaus

  • 0 in reply to Klaus
    TI__Guru 57697 points

    Hello Klaus,

    Thanks for confirming that it worked.