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BQ40Z60: OCVFR flag

Intellectual 335 points

Replies: 3

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Part Number: BQ40Z60

[OCVFR]: An OCV reading is taken when a dV/dt condition is met. This is not the case if charging stops within the flat voltage region.
By default, this flag is set. The device will take a 48-hour wait before taking an OCV reading if charging stops below the FlatVoltMax. A discharge will not cancel this 48-hour wait. The 48-hour wait will only clear if charging stops above the FlatVoltMax level. Setting this flag to 0 removes the 48-hour wait requirement, and OCV is taken when the dV/dt condition is met. Removing the 48-hour requirement can be useful sometimes to reduce test time during evaluation.

May I know the range of flat voltage region of LiFePO4? Can I set OCVFR flag to 0 in normal release code?  what's the impact?

  • Hello Harry,

    I believe the chemistry ID has the Flat Range voltages, I would not be able to tell you without the chem ID number.

    Turning the OCVFR off may cause some gauging errors if the OCV is taken in the flat range because it is hard for the gauge to find the correct grid point to match that OCV to the table from the chem ID.

    Sincerely,

    Wyatt Keller

  • In reply to Wyatt Keller:

    the chem id is 0404.

  • In reply to Harry Zhang13:

    Its flat region is from 3274mV to 3351mV.

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