• State
  • Locked Locked
  • Replies 5 replies
  • Subscribers 62 subscribers
  • Views 362 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.

BQ27510 for multicell

Rakesh Muralidharan
Expert 2810 points
Other Parts Discussed in Thread: BQ27510-G2, BQ27510

Hi,


This is the Schematics we have prepared for Battery Gauging using BQ27510-G2 For Multicell (11.1V, 6600mAH), (3cell(series) ).
Please verify the schematics. Do not be alarmed by wrong value of resistor divider for opamp , precision resistance will be chosen . We want to ensure that
we havn't missed any thing.
As we are not able to use BQ27510-EVM for multicell we plan to use the same board for calibaration and prepare the golden image using BQeasy.Load header and I2C header are provided for this purpose.

Also I2C section I am not clear on the need of aditional capacitors and resistors mentioned in the evaluation board(Bq27510-EVM).So
I have not implemented this section. Does we need those configuration , or can I do away with it?8688.SCHEMATIC1 _ PAGE71.pdf

  • 0
    TI__Expert 4050 points

    1Not sure how I2C is pulled up to different voltage.

    2. how 3S voltage is divided?

     

    using system board for calibration and generate golden image is ok.

     

    Ming

  • 0 in reply to Ming Yu
    Expert 2810 points

    1) I2C is pulled up to 3V or 2.5V . When preparing the golden image we plan to isolate the Battery monitoring circuit from the whole system. At that particular point I2C will be pulled up to 2.5V as in the evaluation module. Once the golden image is prepared and fused into Bq27510 we remove off the isolation pull I2C to 3V and open up the 2.5V.

    2. 3Cell voltage is divided using 1M, 2M 0.1% precision resistances. Voltage divider output would be 3.7V (nominal battery voltage).

    You still didnt comment on the I2C capacitance part. Header JP1 is used for connecting EV2300. will the wire length affect the veracity of i2c communication.??

  • 0 in reply to Rakesh Muralidharan
    TI__Expert 4050 points

    the caps and resistors on I2C line is for ESD protection. If the I2C will not brought out then there is no need to have them.

  • 0 in reply to Ming Yu
    Expert 2810 points

    Hi,

    Our board for battery monitoring has arrived . i am probing REG25 pin for which i am seeing 2.94V rather than 2.5V. i think i have made a serious error. To the REGIN i have directly applied the 3cell voltage (11.1V) rather than what was suggested in the recommended condition (2.7V to 5.5V) .  I was under the notion that internal regulator  will convert this to 2.5V allow the other internal to communicate properly.

    Will this impact the proper functioning of the device??? please comment.....

    Also I am not able to establish any communication with the EV2300......

    Regards

    Rakesh M.

  • 0 in reply to Rakesh Muralidharan
    Expert 2810 points

    I have also tried bring down the applied voltage to 4V level.Even then the REG25 pin o/p voltage remains at 3V level.

    Regards

    Rakesh M