Other Parts Discussed in Thread: EV2400, , BQSTUDIO
Hi,
Recently we have tried completing the learning cycle twice, and in both times the device was not recognized at the end of the final discharge to empty.
Below is a list of the components used:
- INR18650-35E Samsung SDI
- BQ28Z610EVM-532
- Texas Instruments EV2400
The learning cycle was conducted as follows:
- The bq28z610EVM-532 was directly connected to two INR18650-35E SAMSUNG SDI cells
- Bq28z610EVM-532 was connected to the EV2400 interface board which was connected to the PC
- Battery management studio was launched and 2610_0_20_bq28z610 was selected from the list
- Fuel gauge firmware was updated to the latest version
- Chem id selected was “2123”
- Data memory was left the same except for
- Design Capacity: 3350mAh
- Design Capacity: 2412cWh
- Design Voltage:7200mV
- Charge Term Taper Current: 150mA
- Discharge current threshold: 75mA
- Charge current threshold: 75mA
- Quit current: 10mA
- Term Voltage: 5300mV
- For initial discharge, the alternative method was used. By the end of the 5 hour period, the VOK bit was cleared, and REST was set
- After initial discharge and rest period, the update status bit in Data Memory was still at 00-
- Once the charge to full started, the VOK bit was set as expected and it cleared after the rest period. Note that the update status remained at 0
- For the final discharge to empty, an electronic load was discharging the batteries at 1.5A. During discharge, the update status was still at 0. Batteries reached 0% charge capacity at 5.6V. The moment the electronic load was turned off, bqstudio couldn’t recognize the device anymore and everything turned grey. Note that the same process is implemented during initial discharge, however this seems to happen only once the final discharge is complete.
Please advice, as this issue occurred both times a learning cycle was attempted.
