SLUSFB5A June   2024  – April 2025 BQ41Z50

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
    1. 4.1 Pin Equivalent Diagrams
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Supply Current
    6. 5.6  Power Supply Control
    7. 5.7  Low Dropout Regulators
    8. 5.8  Internal Oscillators
    9. 5.9  Voltage References
    10. 5.10 Current Wake Detector
    11. 5.11 VC0, VC1, VC2, VC3, VC4, PACK
    12. 5.12 Cell Balancing Support
    13. 5.13 SMBD, SMBC
    14. 5.14 PRES/SHUTDN, DISP
    15. 5.15 ALERT
    16. 5.16 LEDCNTLA, LEDCNTLB, LEDCNTLC
    17. 5.17 Coulomb Counter
    18. 5.18 Coulomb Counter Digital Filter (CC1)
    19. 5.19 Current Measurement Digital Filter (CC2)
    20. 5.20 Analog-to-Digital Converter
    21. 5.21 ADC Digital Filter
    22. 5.22 CHG, DSG High-side NFET Drivers
    23. 5.23 Precharge (PCHG) FET Drive
    24. 5.24 FUSE Drive
    25. 5.25 Internal Temperature Sensor
    26. 5.26 TS1, TS2, TS3, TS4
    27. 5.27 Flash Memory
    28. 5.28 OT, SCD, OCC, OCD1, OCD2 Protection Thresholds (SCOMP)
    29. 5.29 OT, SCD, OCC, OCD1, OCD2 Protection Timing (SCOMP)
    30. 5.30 GPIO1, GPIO2, GPIO3, GPIO4, GPIO5, GPIO6, GPIO7
    31. 5.31 Elliptical Curve Cryptography (ECC)
    32. 5.32 SMBus Interface Timing
    33. 5.33 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Primary (1st Level) Safety Features
      2. 6.3.2 Secondary (2nd Level) Safety Features
      3. 6.3.3 Charge Control Features
      4. 6.3.4 Gas Gauging
      5. 6.3.5 Lifetime Data Logging Features
      6. 6.3.6 Authentication
      7. 6.3.7 Configuration
        1. 6.3.7.1 Oscillator Function
        2. 6.3.7.2 Real Time Clock
        3. 6.3.7.3 System Present Operation
        4. 6.3.7.4 Emergency Shutdown
        5. 6.3.7.5 2-Series, 3-Series, or 4-Series Cell Configuration
        6. 6.3.7.6 Cell Balancing
        7. 6.3.7.7 LED Display
      8. 6.3.8 Battery Parameter Measurements
        1. 6.3.8.1 Charge and Discharge Counting
        2. 6.3.8.2 Voltage
        3. 6.3.8.3 Current
        4. 6.3.8.4 Temperature
        5. 6.3.8.5 Communications
          1. 6.3.8.5.1 SMBus On and Off State
          2. 6.3.8.5.2 SBS Commands
    4. 6.4 Device Functional Modes
  8. 7 Applications and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 High-Current Path
          1. 7.2.2.1.1 Protection FETs
          2. 7.2.2.1.2 Chemical Fuse
          3. 7.2.2.1.3 Lithium-Ion Cell Connections
          4. 7.2.2.1.4 Sense Resistor
          5. 7.2.2.1.5 ESD Mitigation
        2. 7.2.2.2 Gas Gauge Circuit
          1. 7.2.2.2.1 Coulomb-Counting Interface
          2. 7.2.2.2.2 Low-dropout Regulators (LDOs)
            1. 7.2.2.2.2.1 REG18
            2. 7.2.2.2.2.2 REG135
          3. 7.2.2.2.3 System Present
          4. 7.2.2.2.4 SMBus Communication
          5. 7.2.2.2.5 FUSE Circuitry
        3. 7.2.2.3 Secondary-Current Protection
          1. 7.2.2.3.1 Cell and Battery Inputs
          2. 7.2.2.3.2 External Cell Balancing
          3. 7.2.2.3.3 PACK and FET Control
          4. 7.2.2.3.4 Temperature Measurement
          5. 7.2.2.3.5 LEDs
      3. 7.2.3 Application Curves
    3. 7.3 Configuring Device Firmware
  9. 8 Power Supply Recommendations
  10. 9 Layout
    1. 9.1 Layout Guidelines
      1. 9.1.1 Protector FET Bypass and Pack Terminal Bypass Capacitors
      2. 9.1.2 ESD Spark Gap
    2. 9.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Third-Party Products Disclaimer
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

6.3.6 Authentication

In addition to SHA-1- and SHA-2-based authentication, the BQ41Z50 device supports authentication by the host with Elliptic Curve Cryptography (ECC), which uses 233-bit key system for the authentication process. The BQ41Z50 device employs the EC-KCDSA variant of ECC authentication. Additionally, the ECC private key is required to be stored only in the Battery Pack Manager, which makes ECC-based key management more simple and secure. The signing time would be less than 100ms and the FW architecture to support this response time enables an additional level of protection.

For additional information on ECC authentication on the BQ41Z50 device, refer to the ECC App Note.