Feature
- Supports current sense resistors down to 1 mΩ
- SHA-256authentication 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-rangecurrent applications (1 mA to > 5 A)
- Active high or lowinterrupt pin
- Reduced power modes (typical battery pack operating rangeconditions)
- Typical SLEEP mode: < 11 μA
- Typical DEEP SLEEP mode:< 9 μA
- Typical OFF mode: < 1.9 μA
- Internal and external temperaturesense functions
- 400-kHz I2C buscommunications interface for high-speed programming and data access
- HDQ one-wire for communication with host
- Compact 12-pinDSBGA package (YPH)
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DescriptionThe Texas Instruments BQ27Z561 Impedance Track? gasgauge solution is a highly integrated, accurate 1-series cell gas gauge with a flash programmablecustom reduced instruction-set CPU (RISC) and SHA-256 authentication for Li-Ion and Li-Polymerbattery packs. The 1-series cell capability includes parallel cells for increasedcapacity.
The BQ27Z561 gas gauge communicates via I2C-compatible and HDQone-wire interfaces and includes several key features that can help facilitate accurate gas gaugingapplications. Integrated temperature sense functions (internal and external options) enable systemand battery temperature measurements. The integrated SHA-256 functionality helps enable secureidentification between systems and packs. The interrupt function facilitates the BQ27Z561 device toinform the system when a state-of-charge (SOC), voltage, or temperature fault occurs. Thelow-voltage operation enables the system to continue monitoring the battery even in deeplydischarged conditions. During low-activity situations, the device can be set to the low powercoulomb counting (CC) mode, which allows the device to continue its coulomb counting while reducingoperating current significantly.
