Other Parts Discussed in Thread: BQSTUDIO, BQ40Z50, BQ34110, BQ34Z100-G1
Hello,
I am using the BQ28z610 in a system (not pack) application. The battery is external to the main PCB which has the gauge on it. The pack already has charge/discharge protection therefore I'm not using any of the pack protection elements so the schematic is simplified. Schematic attached. The pack is 2S1P configuration 8.4V (4.2V/cell) 600mAh. The battery will be embedded in the device and is not user replaceable.
The Battery voltage gauge in BqStudio always shows 0V and Cell 1 voltage and Cell 2 voltage are always 0, but Bat pin voltage and Pack pin voltage are correct.
I have disabled any protections in the protections registers, since I don't need them. I have also raised the limits on the over-voltage and under-voltage protection. I have cleared the CC0 bit to enable "single cell" mode. I have also disabled balancing.
If I use an external power supply to drive a little voltage to the pins instead of using the battery, I get a good voltage reading when less than 6V. When the supply is set to > 6V, then BQstudio shows 0V as the voltage in registers 0x08/0x09.
Picture of the schematic is attached. Is this device just not capable of such a configuration or is it just a matter of getting the register configuration correct?