A few more questions related to bq27421:
1. The gauge is in the design created a while back, before the datasheet and tech manual mentioned not to ground BIN pin directly on the gauge.So that pin is grounded. Battery is always present and is not removable. After power up we do not see anything weird on the LDO output pin, and BATDetect bit is set. The gauge is mostly behaving , and the ITPOR bit gets cleared and does not come back. So it appears no resets happen after the initial power up.What is the long term impact of that pin being wired that way?
2. The same chip does exhibits a few oddities- on reset, some NVRAM values do not match defaults. That's in a system with no processor running and only I2C communication between the gauge and EV2300. For example "FC Set" gets changed to 127, with a valid range from -1 to 100, and the R_a0 2 value goes to -32660 despite RUP_DIS flag being set, and no RES_UP bit set. Power cycling or swapping battery to another one makes no difference.
3. On a chip with v 1.0.9 of firmware a bunch of data ram registers come up with values differing from defaults listed in the manual (and from v 1.08 chips). Again this is after POR and no other comms.
1.09 vs 1.08
Min DOD Res Update = 6 Min DOD Res Update = 70
Hibernate V = 2072 Hibernate V = 2200
Dsg Current Threshold = 39 Dsg Current Threshold = 167
Quit Current = 58 Quit Current = 250
Transient Factor Charge = 51 Transient Factor Charge = 179
Transient Factor Discharge = 51 Transient Factor Discharge = 179
Max IR Correct = 272 Max IR Correct = 400