Other Parts Discussed in Thread: BQSTUDIO, BQ40Z50
Tool/software:
Hello, any help with the following would be greatly appreciated.
We are seeing odd behaviour with the BQ25798 when charing a 2s0p battery pack and struggling to determine the fault, perhaps configuration but as of yet, the root cause eludes us.
When we have the battery pack installed the 0x1d VBAT Present status register correctly detects the pack, however, after supplying a voltage to the AC1, AC2, and VBUS lines we see the status register flip to VBAT NOT Present. We believe this is stopping the device from charging the battery pack.
BQStudio BQ25798 Field View
- Battery Installed w/ no supply on VAC1, VAC2, VBUS
- VBAT Present Status (0x1D) = VBAT Present
- AC1, AC2, VBUS Status (0x1B) = NOT Present
- Battery Installed w/ supply (8.4v 0.5a) on VAC1, VAC2, VBUS
- VBAT Present Status (0x1D) = VBAT NOT Present
- AC1, AC2, VBUS status (0x1B) = Present
This was discovered during a pack learning cycle with the BQ40Z50-R3 gauge, everything works fine until we attempt to recharge the cell after a discharge cycle.
[BQ25798] -> [BQ40Z50] -> Cell 1 + 2.
Registers
* Created: Thu Jul 25 04:59:05 AEST 2024 * * Format: Register Name tab Character,\t Register Address tab Character,\t Hexadecimal register value. * BQZ Container: Charger_2_00-bq25798.bqz * REG00 00 12 REG01 01 348 REG03 03 C8 REG05 05 24 REG06 06 12C REG08 08 C3 REG09 09 05 REG0A 0A 63 REG0B 0B DC REG0D 0D 4B REG0E 0E 3D REG0F 0F A2 REG10 10 85 REG11 11 40 REG12 12 00 REG13 13 21 REG14 14 16 REG15 15 AA REG16 16 C0 REG17 17 7A REG18 18 54 REG19 19 12C REG1B 1B 2F REG1C 1C 0A REG1D 1D 00 REG1E 1E 00 REG1F 1F 10 REG20 20 00 REG21 21 00 REG22 22 0F REG23 23 12 REG24 24 40 REG25 25 10 REG26 26 00 REG27 27 00 REG28 28 00 REG29 29 00 REG2A 2A 00 REG2B 2B 00 REG2C 2C 00 REG2D 2D 00 REG2E 2E 30 REG2F 2F 00 REG30 30 00 REG31 31 00 REG33 33 00 REG35 35 00 REG37 37 00 REG37 39 00 REG3B 3B 00 REG3D 3D 00 REG3F 3F 00 REG41 41 00 REG43 43 00 REG45 45 00 REG47 47 00 REG48 48 18
