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BQ27520-G4: RUP_DIS bit in CONTROL_STATUS (0x0000)

K.Yaita
Guru 29690 points
Part Number: BQ27520-G4

Hi Team,

Technical Reference Manual shows the following about RUP_DIS bit.
--------------------------------------------------------

http://www.tij.co.jp/jp/lit/ug/sluua35/sluua35.pdf

--------------------------------------------------------
Could you tell me the definition of "allowable values" ? (Is it specific values?)
Is it related with Ra Max Delta?

Best Regards,
Yaita / Japan disty

  • 0
    TI__Intellectual 1735 points

    • Hi,
    • In order to aviod the Ra value is updated to a abnormal value, the allowable values which is related with Ra Max Delta will limit the changes of Ra.

  • 0 in reply to answer
    Guru 29690 points

    Hi Terry-san,

    Thank you for your reply.

    I understood "allowable values" is related with Ra Max Delta.
    In terms of "allowable values", is there another parameter other than Ra Max Delta that disables Ra table updates?
    *For example: Min Res Factor, Max Res Factor, Min Res Scale, Max Res Scale, etc..

    Best Regards,
    Yaita / Japan disty?

  • 0 in reply to K.Yaita
    Guru 29690 points

    May I have your comments?

    Best Regards,
    Yaita

  • 0 in reply to K.Yaita
    TI__Intellectual 1735 points
    Hi,
    Min Res Scale and Max Res Scale will also limit the change of Ra when the battery is close to empty.
    When the SOC < Fast Scale Start SOC or Voltage < (Terminate Voltage + Term V Delta),
    Fast Resistance Scaling function is enabled and Min Res Scale and Max Res Scale parameters will work.
  • 0 in reply to answer
    Guru 29690 points

    Hi Terry-san,

    Thank you for your reply however I would like to know which parameters of bq27520-G4 are related to set RUP_DIS bit about the following red line. 
    -------------------------------------------------------

    -------------------------------------------------------
    Is it Ra Max Delta only?
    My customer wants to know all parameters of bq27520-G4 which are related to set RUP_DIS bit.

    Best Regards,
    Yaita

  • 0 in reply to K.Yaita
    TI__Intellectual 1735 points
    Hi,
    The Ra table is updated when doing the learning cycle. During this time, when the battery is not very close to empty, only the Ra Max Delta will limit the change of Ra table. When the battery is close to empty and Fast Resistance Scaling function is enabled, min Res Scale and Max Res Scale parameters will also have effects on the Ra table.
  • 0 in reply to answer
    Guru 29690 points

    Hi Terry-san,

    Could you tell me all parameters of bq27520-G4 which are related to set RUP_DIS bit about the following red line?
    My customer wants to know the specific parameters that are related to set RUP_DIS bit.



    Best Regards,
    Yaita

  • 0 in reply to K.Yaita
    TI__Guru* 76230 points

    hi Yaita,

    If a wrong chem id is used, the resistance that will be calculated by the algorithm will be wrong and that could cause the rupdis to get set.  Also, during the learning cycle if the discharge current used is not between c/10 and c/5, that will cause the rupdis to get set as well.

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Guru 29690 points

    Hi Onyx-san,

    Thank you for your support.
    Did you say the following red line doesn't represent the parameters like Ra Max Delta and Min Res Factor, Max Res Factor, Min Res Scale, Max Res Scale?



    I just want to know what is "allowable values" in detail.

    Best Regards,
    Yaita / Japan disty