I am working on a project using the BQ27542 Battery Gas Gauge paired with a BQ24296 Charge Controller and a user-replacable NCR18650B Li-ion MH12210 battery. I have evaluation modules for both the charge controller and gas gauge, and a PCB of our own design with both chips on it.
Here's my puzzle: when I connect the battery to the development modules, the state of charge reads correctly. When I connect the battery to our PCB, the state of charge is always very low.
Other features seem to be working fine, so I don't think it's a hardware problem. I've made sure the Design Capacity is set correctly on both sets of hardware. Are there other settings on the gas gauge I should be verifying?
Thank you.