ZHCSBS5D January   2011  – May 2015

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 简化电路原理图
  5. 5 修订历史记录
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics: Supply Current
    6. 7.6  Power-On Reset (POR)
    7. 7.7  Wake From Sleep
    8. 7.8  RBI RAM Backup
    9. 7.9  3.3-V Regulator
    10. 7.10 2.5-V Regulator
    11. 7.11 DISP, PRES, SMBD, SMBC
    12. 7.12 CHG, DSG FET Drive
    13. 7.13 Internal Precharge Limiting
    14. 7.14 GPOD
    15. 7.15 FUSE
    16. 7.16 LED5, LED4, LED3, LED2, LED1
    17. 7.17 Coulomb Counter
    18. 7.18 VC1, VC2, VC3, VC4
    19. 7.19 TS1, TS2
    20. 7.20 Internal Temperature Sensor
    21. 7.21 Internal Thermal Shutdown
    22. 7.22 High-Frequency Oscillator
    23. 7.23 Low-Frequency Oscillator
    24. 7.24 Internal Voltage Reference
    25. 7.25 Flash
    26. 7.26 OCD Current Protection
    27. 7.27 SCD1 Current Protection
    28. 7.28 SCD2 Current Protection
    29. 7.29 SCC Current Protection
    30. 7.30 SBS Timing Requirements
    31. 7.31 Typical Characteristics
  8. 8 Parameter Measurement Information
    1. 8.1 Battery Parameter Measurements
      1. 8.1.1 Charge and Discharge Counting
      2. 8.1.2 Voltage
      3. 8.1.3 Current
      4. 8.1.4 Auto Calibration
      5. 8.1.5 Temperature
      6. 8.1.6 Communications
        1. 8.1.6.1 SMBus On and Off State
        2. 8.1.6.2 SBS Commands
  9. 9 Detailed Description
    1. 9.1 Overview
      1. 9.1.1 Configuration
        1. 9.1.1.1 Oscillator Function
        2. 9.1.1.2 System Present Operation
        3. 9.1.1.3 2-, 3-, or 4-Cell Configuration
        4. 9.1.1.4 Cell Balancing
          1. 9.1.1.4.1 Internal Cell Balancing
          2. 9.1.1.4.2 External Cell Balancing
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Primary (1st Level) Safety Features
      2. 9.3.2 Secondary (2nd Level) Safety Features
      3. 9.3.3 Charge Control Features
      4. 9.3.4 Gas Gauging
      5. 9.3.5 Lifetime Data Logging Features
      6. 9.3.6 Authentication
    4. 9.4 Device Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 High-Current Path
          1. 10.2.2.1.1 Protection FETs
          2. 10.2.2.1.2 Chemical Fuse
          3. 10.2.2.1.3 Lithium-Ion Cell Connections
          4. 10.2.2.1.4 Sense Resistor
          5. 10.2.2.1.5 ESD Mitigation
        2. 10.2.2.2 Gas Gauge Circuit
          1. 10.2.2.2.1 Differential Low-Pass Filter
          2. 10.2.2.2.2 Power Supply Decoupling and RBI
          3. 10.2.2.2.3 System Present
          4. 10.2.2.2.4 SMBus Communication
          5. 10.2.2.2.5 FUSE Circuitry
          6. 10.2.2.2.6 PFIN Detection
        3. 10.2.2.3 Secondary-Current Protection
          1. 10.2.2.3.1 Cell and Battery Inputs
          2. 10.2.2.3.2 External Cell Balancing
          3. 10.2.2.3.3 PACK and FET Control
          4. 10.2.2.3.4 Regulator Output
          5. 10.2.2.3.5 Temperature Output
          6. 10.2.2.3.6 LEDs
          7. 10.2.2.3.7 Safety PTC Thermistor
        4. 10.2.2.4 Secondary-Overvoltage Protection
          1. 10.2.2.4.1 Cell Inputs
          2. 10.2.2.4.2 Time-Delay Capacitor
      3. 10.2.3 Application Curves
    3. 10.3 System Example
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13器件和文档支持
    1. 13.1 文档支持
      1. 13.1.1 相关文档
    2. 13.2 社区资源
    3. 13.3 商标
    4. 13.4 Glossary
  14. 14机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

8 Parameter Measurement Information

8.1 Battery Parameter Measurements

8.1.1 Charge and Discharge Counting

The bq3050 uses an integrating delta-sigma analog-to-digital converter (ADC) for current measurement, and a second delta-sigma ADC for individual cell and battery voltage and temperature measurement.

The integrating delta-sigma ADC measures the charge/discharge flow of the battery by measuring the voltage drop across a small-value sense resistor between the SR1 and SR2 pins. The integrating ADC measures bipolar signals from –0.25 V to 0.25 V. The bq3050 detects charge activity when VSR = V(SRP) – V(SRN) is positive, and discharge activity when VSR = V(SRP) – V(SRN) is negative. The bq3050 continuously integrates the signal over time, using an internal counter. The fundamental rate of the counter is 0.65 nVh.

8.1.2 Voltage

The bq3050 updates the individual series cell voltages at 0.25-second intervals. The internal ADC of the bq3050 measures the voltage, and scales and calibrates it appropriately. This data is also used to calculate the impedance of the cell for the CEDV gas-gauging.

8.1.3 Current

The bq3050 uses the SRP and SRN inputs to measure and calculate the battery charge and discharge current using a 5-mΩ to 20-mΩ typ. sense resistor.

8.1.4 Auto Calibration

The bq3050 provides an auto-calibration feature to cancel the voltage offset error across SRN and SRP for maximum charge measurement accuracy. The bq3050 performs auto-calibration when the SMBus lines stay low continuously for a minimum of 5 s.

8.1.5 Temperature

The bq3050 has an internal temperature sensor and inputs for two external temperature sensors. All three temperature sensor options are individually enabled and configured for cell or FET temperature. Two configurable thermistor models are provided to allow the monitoring of cell temperature in addition to FET temperature, which may be of a higher temperature type.

8.1.6 Communications

The bq3050 uses SMBus v1.1 with Master Mode and packet error checking (PEC) options per the SBS specification.

8.1.6.1 SMBus On and Off State

The bq3050 detects an SMBus off state when SMBC and SMBD are low for two or more seconds. Clearing this state requires that either SMBC or SMBD transition high. The communication bus will resume activity within 1 ms.

8.1.6.2 SBS Commands

See the bq3050 Technical Reference Manual (SLUU485) for further details.