Hi,
Some of our batteries are using a DS2438 battery fuel gauge and we found out that when the battery is charged in a charger without the 1-wire bus connected (no pull-up on the DQ pin), then the ICA register is not updated. This means that after a full charge, the ICA register keeps the same value as before the charge.
I've read the datasheet many times but can't find any indication that this is an expected behavior. From the DS2438 BLOCK DIAGRAM (Figure 1) of the datasheet, it looks like the power is taken from either the battery cells (through a VREG) or from the DQ pin.
Is this the expected behavior of the battery gauge ?
Regards,