Impedance Track™ integrated circuit gas gauge solution for 1-series
Product details
Parameters
Package | Pins | Size
Features
- 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)
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Description
The Texas Instruments BQ27Z561 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 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. The interrupt function facilitates the BQ27Z561 device to inform the system when a state-of-charge (SOC), voltage, or temperature fault occurs. The low-voltage operation enables the system to continue monitoring the battery even in deeply discharged conditions. During low-activity situations, the device can be set to the low power coulomb counting (CC) mode, which allows the device to continue its coulomb counting while reducing operating current significantly.
Technical documentation
| Type | Title | Date | |
|---|---|---|---|
| * | Datasheet | BQ27Z561 Impedance Track™ Battery Gas Gauge Solution for 1-Series Cell Li-Ion Battery Packs datasheet (Rev. B) | Aug. 06, 2019 |
| User guides | BQ27Z561-R2 Technical Reference Manual (Rev. B) | May 07, 2020 | |
| Application notes | End of Discharge SOC Jump Elimination | Apr. 06, 2020 | |
| Application notes | BQ27Z561-R1 to BQ27Z561-R2 Change List | Feb. 26, 2020 | |
| Application notes | Impedance Track Optimization for Applications Without Significant Rest Periods | Oct. 15, 2019 | |
| User guides | bq27z561 Technical Reference Manual | Jun. 26, 2018 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
Features
- Easy to use impedance track gas gauge
- Acurate cell current, temperature and voltage monitoring
- Over voltage, under voltage, over current, over temperature and under temperature protection
- 1-mOhm sense resistor
- On board EV2400
- On board dual programmable chargers
Description
Several TI Fuel Gauge products support authentication for anti-counterfeit protection of battery packs. The selection of the battery authentication scheme between SHA and ECC is left to the user to decide. bqKeyPackager is provided to package the key, and bqKeyProgrammer is provided to program the (...)
Features
- Supports multiple TI gauge devices that support authentication
- Supports SHA1, SHA256, and ECC key packaging depending on the device
- Keeps key hidden from packmaker for additional security in the manufacturing process
Description
Several TI Fuel Gauge products support authentication for anti-counterfeit protection of battery packs. The selection of the battery authentication scheme between SHA and ECC is left to the user to decide. bqKeyPackager is provided to package the key, and bqKeyProgrammer is provided to program the (...)
Features
- Supports multiple TI gauge devices that support authentication
- Supports SHA1, SHA256, and ECC key packaging depending on the device
- Keeps key hidden from packmaker for additional security in the manufacturing process
Software development
Features
- Supports pack-side gauging including enhanced state of health (SOH) algorithm
- Fast QMax update option based on predicted OCV
- SHA-256 authentication responder for increased battery pack security
- Sophisticated charge algorithms:
- JEITA
- Enhanced charging
- RSOC() charging compensation option
- Added hibernate mode (...)
Features
- Real-time Gauge Dashboard for monitoring basic registers
- Full register access and logging
- Full data memory access and logging
- Product configuration and monitoring tools
- Import and export of product configurations
- Calibration and test automation
- Export of FS files for the target production environment
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| DSBGA (YPH) | 12 | View options |
Ordering & quality
Support & training
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Training series
View all TI training and videosVideos
How to perform a successful learning cycle with gauges
Learn how to perform successful learning cycles to get the fuel gauge to report accurate state-of-charge (SOC).
