Texas Instruments bq41Z50 Battery Pack Manager
Texas Instruments bq41Z50 Battery Pack Manager incorporates Dynamic Z-Track™ technology and is a fully integrated, single-chip, pack-based solution. It provides a rich array of gas gauging, protection, and authentication features for 2-series, 3-series, and 4-series cell LiPO, Li-ion, and LiFePO4 battery packs. Using an ultra-low power 32-bit RISC processor and its integrated high-performance analog peripherals, the bq41Z50 device maintains and measures an accurate record of available voltage, cell capacity, temperature, current, and other critical battery parameters. It reports them to the system host controller using an SMBus v3.2 compatible interface.
The bq41Z50 device utilizes Dynamic Z-Track technology to report a highly accurate state of charge even under dynamic loading conditions. The Z-Track technology also improves the accuracy of TURBO mode by providing the available maximum power and maximum current to the host system.
The Texas Instruments bq41Z50 provides various battery safety functions, including overvoltage, overtemperature, overcurrent in discharge, overcurrent in charge, and short circuit in discharge protection. System safety functions incorporate FET protection for the N-CH FETs and cell disconnection detection. The device firmware provides software-based 1st- and 2nd-level safety protection against overvoltage, undervoltage, overcurrent, short circuit current, and overtemperature conditions. Pack- and cell-related faults are also handled by firmware-based protections.
Features
- Fully integrated 2-series, 3-series, and 4-series cell LiPO, Li-ion, or LiFePO4 battery pack manager and protection
- Ultra-low power 32-bit RISC processor
- TI Dynamic Z-Track algorithm
- Up to 40V-tolerant power supply pins
- High-side N-CH protection FET drive with configurable drive strength
- Precision analog front-end with two independent 16-bit ADCs
- Support for simultaneous current and voltage sampling
- Support for up to four external thermistor measurements and an internal temperature sensor
- Primary and secondary levels of protection
- Overvoltage and undervoltage
- Overcurrent in charge and discharge
- Short circuit in the discharge
- Overtemperature
- Charge timeout
- CHG and DSG FET drivers
- Sophisticated charge algorithms
- JEITA
- Adaptive charging based on cycle time, run time, and SOH
- Cell balancing
- Integrated cell balancing while charging or at rest
- Supports TURBO mode
- Diagnostic lifetime data monitor and black box recorder
- Optional up to three LED display support
- Supports Elliptic Curve Cryptography (ECC), SHA-2, and SHA-1 authentication
- Up to 1MHz SMBus v3.2 host communication support
- An extensive array of programmable protection
- Four GPIOs that can be configured to control a 3-segment LED display or as general-purpose push-pull I/O pins capable of 5.5V maximum pull-up voltage
- Two GPIOs that can be general-purpose push-pull I/O
- One GPIO that can be a general-purpose open-drain I/O
- Integrated secondary chemical fuse I/O
- Cell balancing supports up to 25mA bypass per cell
- Elliptical curve cryptography (ECC) authentication for robust battery pack security:
- Eliminates the need for a shared key on the host-side controller
- 233-bit private key stored in secure memory (no access from program flash)
- Integrated hardware accelerator for a faster authentication process
- SHA-1 and SHA-2 authentication support
- 32-lead WQFN (RSN) compact package
Applications
- Notebooks/netbook PCs
- Tablets
- Drones
- Handheld vacuum cleaners and vacuum robots
- Medical and test equipment
- Portable electronics
Functional Block Diagram
Development Tool
Texas Instruments bq41Z50EVM Evaluation Module
Evaluates the bq41Z50 fuel gauge within applications powered by multi-cell battery systems.