ZHCSLW6A december   2020  – august 2023 BQ25157

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 说明（续）
  7. 6 Device Key Default Settings
  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
    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  Linear Charger and Power Path
        1. 9.3.1.1 Battery Charging Process
          1. 9.3.1.1.1 Pre-Charge
          2. 9.3.1.1.2 Fast Charge
          3. 9.3.1.1.3 Pre-Charge to Fast Charge Transitions and Charge Current Ramping
          4. 9.3.1.1.4 Termination
        2. 9.3.1.2 JEITA and Battery Temperature Dependent Charging
        3. 9.3.1.3 Input Voltage Based Dynamic Power Management (VINDPM) and Dynamic Power Path Management (DPPM)
        4. 9.3.1.4 Battery Supplement Mode
      2. 9.3.2  Protection Mechanisms
        1. 9.3.2.1 Input Over-Voltage Protection
        2. 9.3.2.2 Safety Timer and I2C Watchdog Timer
        3. 9.3.2.3 Thermal Protection and Thermal Charge Current Foldback
        4. 9.3.2.4 Battery Short and Over Current Protection
        5. 9.3.2.5 PMID Short Circuit
      3. 9.3.3  ADC
        1. 9.3.3.1 ADC Operation in Active Battery Mode and Low Power Mode
        2. 9.3.3.2 ADC Operation When VIN Present
        3. 9.3.3.3 ADC Measurements
        4. 9.3.3.4 ADC Programmable Comparators
      4. 9.3.4  VDD LDO
      5. 9.3.5  Load Switch/LDO Output and Control
      6. 9.3.6  PMID Power Control
      7. 9.3.7  MR Wake and Reset Input
        1. 9.3.7.1 MR Wake or Short Button Press Functions
        2. 9.3.7.2 MR Reset or Long Button Press Functions
      8. 9.3.8  14-Second Watchdog for HW Reset
      9. 9.3.9  Faults Conditions and Interrupts ( INT)
        1. 9.3.9.1 Flags and Fault Condition Response
      10. 9.3.10 Power Good ( PG) Pin
      11. 9.3.11 External NTC Monitoring (TS)
        1. 9.3.11.1 TS Thresholds
      12. 9.3.12 External NTC Monitoring (ADCIN)
      13. 9.3.13 I2C Interface
        1. 9.3.13.1 F/S Mode Protocol
    4. 9.4 Device Functional Modes
      1. 9.4.1 Ship Mode
      2. 9.4.2 Low Power
      3. 9.4.3 Active Battery
      4. 9.4.4 Charger/Adapter Mode
      5. 9.4.5 Power-Up/Down Sequencing
    5. 9.5 Register Map
      1. 9.5.1 I2C Registers
  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 (IN/PMID) Capacitors
        2. 10.2.2.2 VDD, LDO Input and Output Capacitors
        3. 10.2.2.3 TS
        4. 10.2.2.4 Recommended Passive Components
      3. 10.2.3 Application Curves
  12. 11Power Supply Recommendations
  13. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  14. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 第三方产品免责声明
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 接收文档更新通知
    4. 13.4 支持资源
    5. 13.5 静电放电警告
    6. 13.6 Trademarks
    7. 13.7 术语表
  15. 14Mechanical, Packaging, and Orderable Information

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9.3.6 PMID Power Control

The BQ25157 offers the option to control PMID through the I2C PMID_MODE bits. These bits can force PMID to be supplied by BAT instead of IN, even if VIN > VBAT + VSLP . They can also disconnect PMID, pulling it down or leaving it floating. Table 9-4 shows the expected device behavior based on the PMID_MODE setting as detailed in Table 9-4 below.

Table 9-4 PMID_MODE Control
PMID_MODEDESCRIPTIONPMID SUPPLYPMID PULL-DOWN
00Normal OperationIN or BATOff
01Force BAT PowerBATOff
10PMID Off - FloatingNoneOff
11PMID Off - Pulled DownNoneOn

PMID_MODE = 00

This is the default state/normal operation of the device. PMID will be powered from IN if VIN is valid or it will be powered by BAT. PMID will only be disconnected from IN or BAT and pulled down when a HW Reset occurs or the device goes into Ship Mode.

PMID_MODE = 01

When this configuration is set, PMID will be powered by BAT if VBAT >VBATUVLO regardless of VIN or CE state. This allows the host to minimize the current draw from the adapter while it is still connected to the system. If PMID_MODE = 01 is set while VBAT < VBATUVLO, the PMID_MODE = 01 setting will be ignored and the device will go to PMID_MODE = 00. If VBAT drops below VBATUVLO while PMID_MODE = 01 the device will automatically switch to PMID_MODE=00. This prevents the device from needing a POR in order to restore power to the system and allow battery charging. If PMID_MODE = 01 is set during charging, charging will be stopped and the battery will start to provide power to PMID as needed.

PMID_MODE = 10

When this configuration is set, PMID will be disconnected from the supply (IN or BAT) and left floating. VDD and the digital remain on and active. The LDO will be disabled. When floating, PMID can only be forced to a voltage up to VBAT level. Note that this mode can only be exited through I2C or MR HW Reset.

PMID_MODE = 11

When this configuration is set, PMID will be disconnected from the supply (IN or BAT)and pulled down to ground. VDD and the digital remain on and active. The LDO will be disabled. Note that this mode can only be exited through I2C or MR HW Reset.