Hello,
We are developing a 2 cell pack with the bq20z95 gauge and bq24765 charger and have chosen a Depleted Voltage threshold of 5000mV and set the CS_XCHGLV bit, so that the DSG FET opens when the voltage falls below 5000mV for 2 seconds. This works well, as per the attached log file. However, at the same time as the XCHGLV flag is set, the FCHG flag is cleared and the Charging Current is set to 0V, so that when I attach the smart charger, it won't charge unless I issue a reset command. I've attached my gg file and a capture of the bqEVSW screen.
Page 58 of SLUA404 states that "A charger must be detected as present for a Depleted Voltage fault to occur." Is this a typo or something? It doesn't make sense to me. As far as having an external voltage source goes, we are planning to use the charger's VDDP reference to recover the pack from a deep discharge, (SLUA533) although, it was not connected at the time of the test.
I've also noticed that after I reset the gauge, the PMS_CHG flag is set in the FET status and although the Charging Current is restored to the full rate 1280mA, the measured charge current slowly ramps up from a few mA.
Any suggestions on how to get this pack charging will be appreciated!
Thank you,
Jeremy.
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