Greetings,
I am trying to create a golden pack image for a bq20z655-R1. The application note SLUA379E (Data Flash Programming and Calibrating the bq20zxx Family of Gas Gauges) describes a procedure for preparing a golden pack for the bq20zxx family. In section 2.1 (creating pre-learned defaults), step 10 says to "reprogram the pack with a fresh .senc to clear all hidden constants". Where can I get this file? I have been trying to find it on the product page, or in this forum, but I have not come across it yet. Can you please provide me with the file to use? For context, I have included the full procedure described in section 2.1 of the application note at the end of this message. Perhaps the additional context will make clear what the application note is attempting to get me to do.
Thank you,
Jason Maestri
1. Assemble a battery pack with the bq20z80 solution, which includes setting basic flash constants for a
given pack configuration, calibrating the pack, connecting System Present to ground, and enabling IT.
This is described in detail in the application report Pack Assembly and the bq20z80 (SLUA335), which
also applies to the bq20zxx.
2. In particular, it is important to set parameters specific to the number of serial cells used. This is
described in application report bq20z80 EVM Data Flash Settings for Number of Serial Cells and Pack
Capacity (SLVA208), which also applies to the rest of the bq20zxx family.
3. To achieve maximum accuracy of first cycle parameter acquisition, set an initial guess for Qmax Cell 0,
Qmax Cell 1, Qmax Cell 2, Qmax Cell 3, and Qmax Pack. These values are in mAh as specified in the
battery manufacturer data sheet. For example, if single-cell data-sheet capacity is 2400 mAh and 3
parallel cells are used, set each value to 2400 × 3 = 7200 mAh.
4. Charge the pack to full.
5. Let it relax for 2 hours.
6. Discharge the pack to the minimum system-acceptable voltage (should be the same as DF.Gas
Gauging.IT Cfg.Term Voltage) at the typical application rate. The exact rate is not critical.
7. Let it relax for 5 hours.
2 Data Flash Programming and Calibrating the bq20zxx Family of Gas Gauges SLUA379E–May 2006–Revised August 2013
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Copyright © 2006–2013, Texas Instruments Incorporated
www.ti.com Reading and Saving the Data Flash Image From the Golden Pack
8. Repeat Steps 4 through 7 to achieve maximum impedance table accuracy. Verify that DF.Gas
Gauging.State.Update Status reads 06. If not, repeat the cycle. Its normal value should be 06.
9. Use the EVSW to export the .gg File. Open the .gg file with Notepad to change DF.Gas
Gauging.State.UpdateStatus to 02. Change DF.SBS Configuration.Data.Cycle Count to 0.
10. Reprogram the pack with a fresh .senc to clear all hidden constants.
11. Use the EVSW to import the modified .gg file as saved in Step 9. Write All.
12. Send reset command (0x0041).
The golden pack is now ready to have its data flash read into a binary file as described in the function listed in Section 3.