The device acts as an SMBus Slave device. It allows a host processor (the main system CPU) to query battery status easily. Key registers (Standard SBS commands) include:
For new product development in 2024-2025, do not use the bq40370 . TI lists it as "NRND." Use the BQ40Z50-R2 or BQ40Z80. However, if you are maintaining legacy medical or industrial equipment, you must stick with the bq40370 for drop-in compatibility. bq40370
: Many bq40370-based batteries feature a D6SA3-12 thermal fuse . If the battery is electrically "dead" but the cells have voltage, check if this fuse has blown; replacing it can often restore functionality. The device acts as an SMBus Slave device
: It is an ACEDV (Advanced Compensated End of Discharge Voltage) gauge, which is a hybrid of the Impedance Track (IT) and CEDV methods. TI lists it as "NRND
The BQ40370 is a highly integrated, single-cell lithium-ion battery management IC (BMC) designed for portable and wearable applications. This report provides an overview of the BQ40370's features, specifications, and applications.