Texas Instruments bq27z561 Impedance Track™ Gas Gauge is a highly integrated, accurate 1-series cell gas gauge solution. The device comes 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 gas gauge communicates via 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.
Feature
- Supports current sense resistors down to 1 mΩ
- SHA-256 authentication responder for increased battery pack security
- Two independent ADCs
- Support for simultaneous current and voltage sampling
- High-accuracy coulomb counter with input offset error < 1 μV (typical)
- Low-voltage (2 V) operation
- Supports pack-side gauging
- Wide-range current applications (1 mA to > 5 A)
- Active high or low interrupt pin
- Reduced power modes (typical battery pack operating range conditions)
- Typical SLEEP mode: < 11 μA
- Typical DEEP SLEEP mode: < 9 μA
- Typical OFF mode: < 1.9 μA
- Internal and external temperature sense functions
- 400-kHz I2C bus communications interface for high-speed programming and data access
- HDQ one-wire for communication with host
- Compact 12-pin DSBGA package (YPH)
