Impedance track battery gas gauge solution for 1-series cell li-ion battery packs

The Texas Instruments BQ27Z561-R2 Impedance Track™ gas gauge solution is a highly integrated, accurate

1-series cell gas gauge with a flash programmable custom reduced instruction-set CPU

(RISC) and SHA-256 authentication for Li-ion and Li-polymer battery packs. The

1-series cell capability includes parallel cells for increased capacity.

The BQ27Z561-R2 gas gauge communicates

through I2C-compatible and HDQ one-wire interfaces and includes several

key features that can help facilitate accurate gas gauging applications. Integrated

temperature sense functions (internal and external options) enable system and

battery temperature measurements.

The integrated SHA-256 functionality

helps enable secure identification between systems and packs. The interrupt and BTP

functions facilitate the BQ27Z561-R2 device to inform the system when a specific

state-of-charge (SOC), voltage, or temperature condition occurs. The low-voltage

operation enables the system to continue monitoring the battery even in deeply

discharged conditions. During low-activity situations, set the device to the low

power coulomb counting (CC) mode, which enables the device to continue coulomb

counting, while reducing operating current significantly.