• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 434 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

BQ4050: GPCCEDV Needed After Changing Capacity?

BQ27220: BQ27220

Keith Haydon
Prodigy 130 points
Part Number: BQ27220
Other Parts Discussed in Thread: GPCCEDV

Hi TI team,

We are using the BQ27220 fuel gauge in our design and as I went through the forum questions I came across an answer concerning changing the design capacity. We want to change the design capacity from the default (3000 mAH) to 9600 mAH and the question was asked do any of the other parameters need to be changed. We are adding two more cells in parallel to increase the capacity.

The response from dMax was "Besides changing Design Capacity, they also need to scale EDV R0 inversely proportional to cell capacity.  If they double the cell count then they should halve EDV R0."

1. Would this also be true for the BQ27220? 

2. Would I also want to change the default Full Charge Capacity initially?

Respectfully,

Keith Haydon

  • 0
    TI__Guru* 76230 points

    Hi Keith

    Pls review the TRM for how to configure the guage settings and use gpccedv to configure cedv the parameters of the gauge.

    Default full charge capacity should be set to the design capacity of your packs

    thanks 

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Prodigy 130 points

    Hi Onyx,

    I have reviewed the TRM and I understand the coefficients must be determined through the CEDV data collection process which we will perform, however we need to change the Design Capacity and the question remains does the R0 coefficient also need to change inversely proportional to the Design Capacity as originally asked.

    Respectfully,

    Keith Haydon

  • 0 in reply to Keith Haydon
    TI__Guru* 76230 points
    Hi Keith
    No. The coefficients is calculated for you using the tool. I think the post you were referring to was a customer who didn't want to redo the process after doing it for a 1s and then had a 2p pack of the same batteries.

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 130 points

    Hi Onyx,

    Thank you for your response - Until I get through the CEDV Data collection process I will only change the Design Capacity. Perhaps you can assist me with another question I have concerning the bq27220 TRM and also mentioned in the Calibration manual (slua771). Both manuals mention an ITPOR bit found in the Flags register but I can't seem to find any bit named ITPOR in any of the registers (Operation, Control, Battery Status (Flags) or Gauging) - Could you please direct me to the correct register where this bit may be found?

    Respectfully,

    Keith 

  • 0 in reply to Keith Haydon
    TI__Guru* 76230 points
    Hi Keith

    That flag is non-exitent. That is an error which we need to correct. Sorry for the confusion.

    thanks
    Onyx