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about BQ78PL116 current show jumping in the idle

john xiao
Intellectual 470 points
Other Parts Discussed in Thread: BQ78PL114, BQWIZARD

Dear all:

         I  have According to SLUU330.pdf Calibration the BQ78PL114 Temperature,Current.but I found the bqWizard Current jumping in the idle.the range in the -7mA to 7mA.Why will appear this kind of problem.please help me.Thanks a lot.

john

2011.11.2

  • 0
    TI__Intellectual 1505 points

    Hi John,

    Can you confirm which device you are using? PL114 or the Pl116.

    What is the value of the sense resistor you are using.

    Note: The current measurement will show some tolerance due to the ADC measurement accuracy.

    Please review page 13 of the product specification

    http://www.ti.com/product/bq78pl114

    Ben

  • 0 in reply to Benjamin Sarpong
    Intellectual 470 points

    Hi Ben:

         I use BQ78PL114 EVM.the BQ78PL114 EVM sense resistor is 5-m Ω.

        Now  I know the reason of the current jumping in the idle.

        Thanks  a lot.

     

       John

     

  • 0 in reply to Benjamin Sarpong
    Prodigy 140 points

    Hello,Benjamin Sarpong

    I have some problems with bq78PL116EVM to ask you. I used Buck circuit to charge the lithium battery and connect the buck circuit I designed to the 116EVM. I use DSP2812 to control the drive module of buck circuit. The input voltage is 54.6V and output voltage is 33.6V.

    And when the load is resistor, the buck circuit works well, But when I connected the buck circuit to Pack+ and Pack- of 116EVM, it didn't work and the EVM was brocken.The bqwizard software can't read the information of the EVM. The SMBus communication was interrupted. The software indicated that the SMBus has an error. So do you know the reason for this?

    And how to solve the problem?

     

    Thanks

     

    Yuxiao Gong