SLUUCP8 June 2024 BQ41Z50
The Ra table is part of the impedance profile that updates during discharge when gauging is enabled. The initial Cell 0 R_a0...14, Cell 1 R_a0...14, Cell 2 R_a0...14, Cell 3 R_a0...14 values should be programmed by selecting the correct chemistry data during data flash configuration. A chemistry database is constantly updating, and can be downloaded from the Gas Gauge Chemistry Updater product web page (http://www.ti.com/tool/gasgaugechem-sw). The initial xCell 0 R_a0...14, xCell 1 R_a0...14, xCell 2 R_a0...14, xCell 3 R_a0...14 values are a copy of the non-x data set. Two sets of Ra tables are used alternatively when gauging is enabled to prevent wearing out the data flash.
The Cell 0 R_a Flag, Cell 1 R_a Flag, Cell 2 R_a Flag, Cell 3 R_a Flag and the xCell 0 R_a Flag, xCell 1 R_a Flag, xCell 2 R_a Flag, xCell 3 R_a Flag indicate the validity of the cell impedance table for each cell.
FW updates these values: It is not recommended to change them manually.
High Byte | Low Byte | ||
---|---|---|---|
0x00 | Cell impedance and QMax updated | 0x00 | The table is not used and QMax updated. |
0x05 | RELAX mode and QMax update in progress | 0x05 | RSVD |
0x55 | DISCHARGE mode and cell impedance updated | 0x55 | The table is used. |
0xFF | Cell impedance never updated | 0xFF | A Fast Qmax update without OCV read will also clear the R_DIS flag. The table is never used, no QMax or cell impedance update. |