SLUSFM5 March   2025 BQ76907-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information BQ76907-Q1
    5. 6.5  Supply Current
    6. 6.6  Digital I/O
    7. 6.7  REGOUT LDO
    8. 6.8  Voltage References
    9. 6.9  Coulomb Counter
    10. 6.10 Coulomb Counter Digital Filter
    11. 6.11 Current Wake Detector
    12. 6.12 Analog-to-Digital Converter
    13. 6.13 Cell Voltage Measurement Accuracy
    14. 6.14 Cell Balancing
    15. 6.15 Internal Temperature Sensor
    16. 6.16 Thermistor Measurement
    17. 6.17 Hardware Overtemperature Detector
    18. 6.18 Internal Oscillator
    19. 6.19 Charge and Discharge FET Drivers
    20. 6.20 Comparator-Based Protection Subsystem
    21. 6.21 Timing Requirements - I2C Interface, 100kHz Mode
    22. 6.22 Timing Requirements - I2C Interface, 400kHz Mode
    23. 6.23 Timing Diagram
    24. 6.24 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Device Configuration
      1. 7.3.1 Commands and Subcommands
      2. 7.3.2 Configuration Using OTP or Registers
      3. 7.3.3 Device Security
    4. 7.4 Device Hardware Features
      1. 7.4.1  Voltage ADC
      2. 7.4.2  Coulomb Counter and Digital Filters
      3. 7.4.3  Protection FET Drivers
      4. 7.4.4  Voltage References
      5. 7.4.5  Multiplexer
      6. 7.4.6  LDOs
      7. 7.4.7  Standalone Versus Host Interface
      8. 7.4.8  ALERT Pin Operation
      9. 7.4.9  Low Frequency Oscillator
      10. 7.4.10 I2C Serial Communications Interface
    5. 7.5 Measurement Subsystem
      1. 7.5.1 Voltage Measurement
        1. 7.5.1.1 Voltage ADC Scheduling
        2. 7.5.1.2 Unused VC Pins
        3. 7.5.1.3 General Purpose ADCIN Functionality
      2. 7.5.2 Current Measurement and Charge Integration
      3. 7.5.3 Internal Temperature Measurement
      4. 7.5.4 Thermistor Temperature Measurement
      5. 7.5.5 Factory Trim and Calibration
    6. 7.6 Protection Subsystem
      1. 7.6.1 Protections Overview
      2. 7.6.2 Primary Protections
      3. 7.6.3 CHG Detector
      4. 7.6.4 Cell Open-Wire Protection
      5. 7.6.5 Diagnostic Checks
    7. 7.7 Cell Balancing
    8. 7.8 Device Operational Modes
      1. 7.8.1 Overview of Operational Modes
      2. 7.8.2 NORMAL Mode
      3. 7.8.3 SLEEP Mode
      4. 7.8.4 DEEPSLEEP Mode
      5. 7.8.5 SHUTDOWN Mode
      6. 7.8.6 CONFIG_UPDATE Mode
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Performance Plot
      4. 8.2.4 Random Cell Connection Support
      5. 8.2.5 Startup Timing
      6. 8.2.6 FET Driver Turn-Off
      7. 8.2.7 Usage of Unused Pins
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

8.2.1 Design Requirements

Table 8-1 BQ76907-Q1 Design Requirements
DESIGN PARAMETEREXAMPLE VALUE
Minimum system operating voltage17.5V
Cell minimum operating voltage2.5V
Series cell count7
Sense resistor1mΩ
Thermistor in useyes
Charge voltage29.75V
Maximum charge current6.0A
Peak discharge current40.0A
Configuration settingsprogrammed in registers during customer production
Measurement speedSet to highest resolution (2.93ms per measurement)
Protection subsystem configurationSeries FET configuration, device monitors, disables FETs upon fault, recovers autonomously
OV protection threshold4.30V
OV protection delay375ms (16 ADSCAN cycles)
OV protection recovery hysteresis100mV
UV protection threshold2.5V
UV protection delay141ms (6 ADSCAN cycles)
UV protection recovery hysteresis100mV
SCD protection threshold80mV (corresponding to a nominal 80A, based on a 1mΩ sense resistor)
SCD protection delay45 to 60µs
OCD1 protection threshold68mV (corresponding to a nominal 68A, based on a 1mΩ sense resistor)
OCD1 protection delay10ms
OCD2 protection threshold56mV (corresponding to a nominal 56A, based on a 1mΩ sense resistor)
OCD2 protection delay81.1ms
OCC protection threshold8mV (corresponding to a nominal 8A, based on a 1mΩ sense resistor)
OCC protection delay159.2ms
OTD protection thresholdCode = 2592 (corresponding to ≅ 60°C)
OTD protection delay2 seconds (17 FULLSCANs)
OTD protection recovery Code = 2970 (corresponding to ≅ 55°C) for 2 seconds
OTC protection thresholdCode = 3888 (corresponding to ≅ 45°C)
OTC protection delay2 seconds (17 FULLSCANs)
OTC protection recovery Code = 4428 (corresponding to ≅ 40°C) for 2 seconds
UTD protection thresholdCode = 15169 (corresponding to ≅ –20°C)
UTD protection delay7.97 seconds (68 FULLSCANs)
UTD protection recovery Code = 13398 (corresponding to ≅ –10°C) for 2 seconds
UTC protection thresholdCode = 11319 (corresponding to ≅ 0°C)
UTC protection delay5.04 seconds (43 FULLSCANs)
UTC protection recovery Code = 10318 (corresponding to ≅ 5°C) for 2 seconds
Host watchdog timeout protection delay5 seconds
ALERT pin functionalityUsed for alarm interrupt function
REGOUT LDO UsageEnabled with 3.3V output