Tool/software:
I have been reading the calibration guide (SLUA734) and the EVM User Guide (SLUUAV7) Calibration Section 3.3, but neither say exactly where to measure or apply voltages. My questions for this are as follows:
1. For calibrating cell voltage, do we apply a known voltage right at the VC1 pin, or do we apply it before the resistor (R23 in the above diagram)?
2. For calibrating BAT pin voltage, do we calibrate based off the voltage at the diode (D1 in above diagram) anode or at the cathode? This is different by about 20mV on the EVM board.
3. If the calibration is based off the voltage at the diode's cathode, this voltage seems to jump around by tens of mV when checking with a multimeter. Is this expected behavior and how would you handle this for calibration?
4. For calibrating PACK pin voltage, do we calibrate based off the voltage at the PACK pin or on the PACK+ side of R12 in the diagram above that is connected to the output of the discharge FET (Q3)? This is different by about 10mV on the EVM board.
5. The BQ40z50 Calibration guide (SLUA734) says that there is no longer a need to do CC Offset or Board Offset calibration. Would you still recommend forcing a CC Auto Offset calibration by sending a 0x0013 command during the calibration process?
6. Once CC Auto Offset is set (OFFSET_TAKEN bit it set in CC Auto Config), does it now override anything that is in CC Offset or does CC Offset still matter?
Thanks,
Mackenzie
