ZHCSN83A june   2020  – january 2021 BQ25731

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Description (continued)
  7. 6 Device Comparison Table
  8. 7 Pin Configuration and Functions
  9. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics(BQ25731)
    6. 8.6 Timing Requirements
    7. 8.7 Typical Characteristics
  10. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Power-Up Sequence
      2. 9.3.2  Two-Level Battery Discharge Current Limit
      3. 9.3.3  Fast Role Swap Feature
      4. 9.3.4  CHRG_OK Indicator
      5. 9.3.5  Input and Charge Current Sensing
      6. 9.3.6  Input Voltage and Current Limit Setup
      7. 9.3.7  Battery Cell Configuration
      8. 9.3.8  Device HIZ State
      9. 9.3.9  USB On-The-Go (OTG)
      10. 9.3.10 Converter Operation
      11. 9.3.11 Inductance Detection Through IADPT Pin
      12. 9.3.12 Converter Compensation
      13. 9.3.13 Continuous Conduction Mode (CCM)
      14. 9.3.14 Pulse Frequency Modulation (PFM)
      15. 9.3.15 Switching Frequency and Dithering Feature
      16. 9.3.16 Current and Power Monitor
        1. 9.3.16.1 High-Accuracy Current Sense Amplifier (IADPT and IBAT)
        2. 9.3.16.2 High-Accuracy Power Sense Amplifier (PSYS)
      17. 9.3.17 Input Source Dynamic Power Management
      18. 9.3.18 Input Current Optimizer (ICO)
      19. 9.3.19 Two-Level Adapter Current Limit (Peak Power Mode)
      20. 9.3.20 Processor Hot Indication
        1. 9.3.20.1 PROCHOT During Low Power Mode
        2. 9.3.20.2 PROCHOT Status
      21. 9.3.21 Device Protection
        1. 9.3.21.1 Watchdog Timer
        2. 9.3.21.2 Input Overvoltage Protection (ACOV)
        3. 9.3.21.3 Input Overcurrent Protection (ACOC)
        4. 9.3.21.4 System Overvoltage Protection (SYSOVP)
        5. 9.3.21.5 Battery Overvoltage Protection (BATOVP)
        6. 9.3.21.6 Battery Discharge Overcurrent Protection (BATOC)
        7. 9.3.21.7 Battery Short Protection (BATSP)
        8. 9.3.21.8 System Undervoltage Lockout (VSYS_UVP)
        9. 9.3.21.9 Thermal Shutdown (TSHUT)
    4. 9.4 Device Functional Modes
      1. 9.4.1 Forward Mode
      2. 9.4.2 USB On-The-Go
      3. 9.4.3 Pass Through Mode (PTM)-Patented Technology
    5. 9.5 Programming
      1. 9.5.1 I2C Serial Interface
        1. 9.5.1.1 Timing Diagrams
        2. 9.5.1.2 Data Validity
        3. 9.5.1.3 START and STOP Conditions
        4. 9.5.1.4 Byte Format
        5. 9.5.1.5 Acknowledge (ACK) and Not Acknowledge (NACK)
        6. 9.5.1.6 Target Address and Data Direction Bit
        7. 9.5.1.7 Single Read and Write
        8. 9.5.1.8 Multi-Read and Multi-Write
        9. 9.5.1.9 Write 2-Byte I2C Commands
    6. 9.6 Register Map
      1. 9.6.1  ChargeOption0 Register (I2C address = 01/00h) [reset = E70Eh]
      2. 9.6.2  ChargeCurrent Register (I2C address = 03/02h) [reset = 0080h]
        1. 9.6.2.1 Battery Low Voltage Current Clamp
      3. 9.6.3  ChargeVoltage Register (I2C address = 05/04h) [reset value based on CELL_BATPRESZ pin setting]
      4. 9.6.4  ChargerStatus Register (I2C address = 21/20h) [reset = 0000h]
      5. 9.6.5  ProchotStatus Register (I2C address = 23/22h) [reset = B800h]
      6. 9.6.6  IIN_DPM Register (I2C address = 25/24h) [reset = 4100h]
      7. 9.6.7  ADCVBUS/PSYS Register (I2C address = 27/26h)
      8. 9.6.8  ADCIBAT Register (I2C address = 29/28h)
      9. 9.6.9  ADCIIN/CMPIN Register (I2C address = 2B/2Ah)
      10. 9.6.10 ADCVSYS/VBAT Register (I2C address = 2D/2Ch)
      11. 9.6.11 ChargeOption1 Register (I2C address = 31/30h) [reset = 3F00h]
      12. 9.6.12 ChargeOption2 Register (I2C address = 33/32h) [reset = 00B7]
      13. 9.6.13 ChargeOption3 Register (I2C address = 35/34h) [reset = 0434h]
      14. 9.6.14 ProchotOption0 Register (I2C address = 37/36h) [reset = 4A81h(2S~5s) 4A09(1S)]
      15. 9.6.15 ProchotOption1 Register (I2C address = 39/38h) [reset = 41A0h]
      16. 9.6.16 ADCOption Register (I2C address = 3B/3Ah) [reset = 2000h]
      17. 9.6.17 ChargeOption4 Register (I2C address = 3D/3Ch) [reset = 0048h]
      18. 9.6.18 Vmin Active Protection Register (I2C address = 3F/3Eh) [reset = 006Ch(2s~5s)/0004h(1S)]
      19. 9.6.19 OTGVoltage Register (I2C address = 07/06h) [reset = 09C4h]
      20. 9.6.20 OTGCurrent Register (I2C address = 09/08h) [reset = 3C00h]
      21. 9.6.21 InputVoltage(VINDPM) Register (I2C address = 0B/0Ah) [reset =VBUS-1.28V]
      22. 9.6.22 IIN_HOST Register (I2C address = 0F/0Eh) [reset = 2000h]
      23. 9.6.23 ID Registers
        1. 9.6.23.1 ManufactureID Register (I2C address = 2Eh) [reset = 40h]
        2. 9.6.23.2 Device ID (DeviceAddress) Register (I2C address = 2Fh) [reset = D6h]
  11. 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 Input Snubber and Filter for Voltage Spike Damping
        2. 10.2.2.2 ACP-ACN Input Filter
        3. 10.2.2.3 Inductor Selection
        4. 10.2.2.4 Input Capacitor
        5. 10.2.2.5 Output Capacitor
        6. 10.2.2.6 Power MOSFETs Selection
      3. 10.2.3 Application Curves
  12. 11Power Supply Recommendations
  13. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
      1. 12.2.1 Layout Example Reference Top View
      2. 12.2.2 Inner Layer Layout and Routing Example
  14. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 第三方米6体育平台手机版_好二三四免责声明
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 支持资源
    4. 13.4 Trademarks
    5. 13.5 静电放电警告
    6. 13.6 术语表
  15. 14Mechanical, Packaging, and Orderable Information

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9.3.18 Input Current Optimizer (ICO)

For a recognized input adapter, IINDPM can be configured precisely to prevent adapter collapasing. When a third party unknown adapter is used, then input voltage regulation (VINDPM) feature can be leveraged to prevent input crash. With the increasing of input current, voltage drops along the input cable also increases and voltage measured it charger input port decreases accordingly. VINDPM feature can limit input power from adapter by regulating VBUS at certain value configured at InputVoltage register(0x0Bh/0Ah[]). However, the adapter may still overheat when it is kept running at its voltage limit for a long period of time. Therefore, it is preferred to operate the third party adapter slightly under its current rating. The Input Current Optimizer (ICO) feature can automatically maximize the power of unknown input adapter without continuously working under VINDPM. Note the ICO feature can only be employed when the adapter input current limit is at least 500 mA. Please contact factory for more detail information about ICO feature.
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