Overview
The Texas Instruments BQ27Z561-R1 is a highly integrated, accurate 1-series cell gas gauge solution designed for lithium-ion (Li-Ion) and lithium-polymer battery packs. This device employs a flash-programmable custom reduced instruction-set CPU (RISC) and features SHA-256 authentication for enhanced security. It supports parallel cells for increased capacity and communicates via I2C-compatible and HDQ one-wire interfaces. The BQ27Z561-R1 is optimized for accurate gas gauging applications, including integrated temperature sense functions for both internal and external temperature measurements.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | DSBGA (12-pin) | 1.67 mm × 2.05 mm |
| Operating Frequency | Up to 4.2 MHz | |
| Current Sense Resistor | Down to 1 mΩ | |
| ADC Resolution | 38-µV resolution | |
| Power Modes | SLEEP, DEEP SLEEP, OFF | SLEEP: < 11 μA, DEEP SLEEP: < 9 μA, OFF: < 1.9 μA |
| Temperature Range | -40°C to 85°C | |
| Communication Interfaces | I2C, HDQ one-wire | |
| Thermal Resistance | Junction-to-ambient thermal resistance | 64.1 °C/W |
Key Features
- Supports high-side and low-side current sense resistors down to 1 mΩ
- Enhanced state of health (SOH) algorithm and pack-side gauging
- Fast QMAX update option based on predicted OCV
- SHA-256 authentication responder for increased battery pack security
- Sophisticated charge algorithms including JEITA and enhanced charging
- Two independent ADCs for simultaneous current and voltage sampling
- High-accuracy coulomb counter with input offset error < 1 µV (typical)
- Low-voltage (2-V) operation and wide-range current applications (1 mA to > 5 A)
- Active high or low pulse or level interrupt pin and battery trip point (BTP) support
- Internal and external temperature sense functions
- Diagnostic lifetime data monitor and black box recorder
- 400-kHz I2C bus communications interface and HDQ one-wire for communication with host
Applications
- Smartphones
- Digital still cameras and video cameras
- Tablet computing
- Portable and wearable health devices
- Portable audio devices
Q & A
- What is the primary function of the BQ27Z561-R1 device?
The BQ27Z561-R1 is a highly integrated gas gauge solution for 1-series cell Li-Ion and Li-polymer battery packs, providing accurate battery state-of-charge (SOC) and state-of-health (SOH) measurements.
- What communication interfaces does the BQ27Z561-R1 support?
The device supports I2C and HDQ one-wire communication interfaces.
- What is the minimum current sense resistor value supported by the BQ27Z561-R1?
The device supports current sense resistors down to 1 mΩ.
- What security feature does the BQ27Z561-R1 include?
The device includes a SHA-256 authentication responder for increased battery pack security.
- What are the power modes available on the BQ27Z561-R1?
The device has SLEEP, DEEP SLEEP, and OFF power modes, with typical currents of < 11 μA, < 9 μA, and < 1.9 μA respectively.
- How does the BQ27Z561-R1 measure temperature?
The device includes internal and external temperature sense functions, allowing for both on-die temperature measurements and support for an external NTC thermistor.
- What is the operating frequency of the BQ27Z561-R1 processor?
The processor operates at frequencies up to 4.2 MHz.
- What is the resolution of the ADC in the BQ27Z561-R1?
The ADC has a resolution of 38-µV.
- What tools are required for configuring the BQ27Z561-R1?
The Battery Management Studio (BQSTUDIO) is a graphical user-interface tool required for configuring and testing the device.
- What are some typical applications of the BQ27Z561-R1?
Typical applications include smartphones, digital cameras, tablet computing, portable health devices, and portable audio devices.
