SLUSBP6D september   2013  – april 2023 BQ24296 , BQ24297

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings #GUID-BA2DB09A-966C-4324-B633-1AB165FC219B/SLUSBC14058
    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
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Device Power Up
        1. 9.3.1.1 Power-On-Reset (POR)
        2. 9.3.1.2 Power Up from Battery without DC Source
          1. 9.3.1.2.1 BATFET Turn Off
          2. 9.3.1.2.2 Shipping Mode
        3. 9.3.1.3 Power Up from DC Source
          1. 9.3.1.3.1 REGN LDO
          2. 9.3.1.3.2 Input Source Qualification
          3. 9.3.1.3.3 Input Current Limit Detection
          4. 9.3.1.3.4 D+/D– Detection Sets Input Current Limit (BQ24297)
          5. 9.3.1.3.5 PSEL/OTG Pins Set Input Current Limit
          6. 9.3.1.3.6 HIZ State with 100mA USB Host
          7. 9.3.1.3.7 Force Input Current Limit Detection
        4. 9.3.1.4 Converter Power-Up
        5. 9.3.1.5 Boost Mode Operation from Battery
      2. 9.3.2 Power Path Management
        1. 9.3.2.1 Narrow VDC Architecture
        2. 9.3.2.2 Dynamic Power Management
        3. 9.3.2.3 Supplement Mode
      3. 9.3.3 Battery Charging Management
        1. 9.3.3.1 Autonomous Charging Cycle
        2. 9.3.3.2 Battery Charging Profile
        3. 9.3.3.3 Thermistor Qualification
          1. 9.3.3.3.1 Cold/Hot Temperature Window
        4. 9.3.3.4 Charging Termination
          1. 9.3.3.4.1 Termination When REG02[0] = 1
        5. 9.3.3.5 Charging Safety Timer
          1. 9.3.3.5.1 Safety Timer Configuration Change
        6. 9.3.3.6 USB Timer When Charging from USB100mA Source
      4. 9.3.4 Status Outputs ( PG, STAT, and INT)
        1. 9.3.4.1 Power Good Indicator ( PG) (BQ24296)
        2. 9.3.4.2 Charging Status Indicator (STAT)
        3. 9.3.4.3 Interrupt to Host (INT)
      5. 9.3.5 Protections
        1. 9.3.5.1 Input Current Limit on ILIM
        2. 9.3.5.2 Thermal Regulation and Thermal Shutdown
        3. 9.3.5.3 Voltage and Current Monitoring in Buck Mode
          1. 9.3.5.3.1 Input Over-Voltage (ACOV)
          2. 9.3.5.3.2 System Over-Voltage Protection (SYSOVP)
        4. 9.3.5.4 Voltage and Current Monitoring in Boost Mode
          1. 9.3.5.4.1 Over-Current Protection
          2. 9.3.5.4.2 VBUS Over-Voltage Protection
        5. 9.3.5.5 Battery Protection
          1. 9.3.5.5.1 Battery Over-Voltage Protection (BATOVP)
          2. 9.3.5.5.2 Battery Short Protection
          3. 9.3.5.5.3 System Over-Current Protection
    4. 9.4 Device Functional Modes
      1. 9.4.1 Host Mode and Default Mode
        1. 9.4.1.1 Plug in USB100mA Source with Good Battery
        2. 9.4.1.2 USB Timer When Charging from USB100mA Source
    5. 9.5 Programming
      1. 9.5.1 Serial Interface
        1. 9.5.1.1 Data Validity
        2. 9.5.1.2 START and STOP Conditions
        3. 9.5.1.3 Byte Format
        4. 9.5.1.4 Acknowledge (ACK) and Not Acknowledge (NACK)
        5. 9.5.1.5 Target Address and Data Direction Bit
          1. 9.5.1.5.1 Single Read and Write
          2. 9.5.1.5.2 Multi-Read and Multi-Write
    6. 9.6 Register Map
      1. 9.6.1 I2C Registers
        1. 9.6.1.1  Input Source Control Register REG00 [reset = 00110xxx, or 3x]
        2. 9.6.1.2  Power-On Configuration Register REG01 [reset = 00011011, or 0x1B]
        3. 9.6.1.3  Charge Current Control Register REG02 [reset = 01100000, or 60]
        4. 9.6.1.4  Pre-Charge/Termination Current Control Register REG03 [reset = 00010001, or 0x11]
        5. 9.6.1.5  Charge Voltage Control Register REG04 [reset = 10110010, or 0xB2]
        6. 9.6.1.6  Charge Termination/Timer Control Register REG05 [reset = 10011010, or 0x9A]
        7. 9.6.1.7  Boost Voltage/Thermal Regulation Control Register REG06 [reset = 01110011, or 0x73]
        8. 9.6.1.8  Misc Operation Control Register REG07 [reset = 01001011, or 4B]
        9. 9.6.1.9  System Status Register REG08
        10. 9.6.1.10 New Fault Register REG09
        11. 9.6.1.11 Vender / Part / Revision Status Register REG0A
  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 Inductor Selection
        2. 10.2.2.2 Input Capacitor
        3. 10.2.2.3 Output Capacitor
      3. 10.2.3 Application Performance Plots
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Third-Party Products Disclaimer
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 Receiving Notification of Documentation Updates
    4. 13.4 Support Resources
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information
9.3.1.3.4 D+/D– Detection Sets Input Current Limit (BQ24297)

The BQ24297 contains a D+/D– based input source detection to program the input current limit. The D+/D- detection has three steps: data contact detect (DCD), primary detection, and non-standard adapter detection. When the charging source passes data contact detect, the device would proceed to run primary detection. Otherwise the charger would proceed to run non-standard adapter detection.

GUID-C6F8AF66-9A55-4AD4-BB14-5734A4497AA9-low.gifFigure 9-2 USB D+/D- Detection

DCD (Data Contact Detection) uses a current source to detect when the D+/D– pins have made contact during an attach event. The protocol for data contact detect is as follows:

  • Detect VBUS present and REG08[2] = 1 (power good)
  • Turn on D+ IDP_SRC and the D– pull-down resistor RDM_DWN for 40 ms
  • If the USB connector is properly attached, the D+ line goes from HIGH to LOW, wait up to 0.5 sec.
  • Turn off IDP_SRC and disconnect RDM_DWN

The primary detection is used to distinguish between USB host (Standard Down Stream Port, or SDP) and different type of charging ports (Charging Down Stream Port, or CDP, and Dedicated Charging Port, or DCP). The protocol for primary detection is as follows:

  • Turn on VDP_SRC on D+ and IDM_SINK on D– for 40 ms
  • If PD is attached to a USB host (SDP), the D– is low. If PD is attached to a charging port (CDP or DCP), the D– is high
  • Turn off VDP_SRC and IDM_SINK

Table 9-1 shows the input current limit setting after D+/D– detection.

Table 9-1 BQ24297 USB D+/D– Detection
D+/D– DETECTIONOTGINPUT CURRENT LIMITREG08[7:6]
0.5 sec timer expired in DCD (D+/D- floating)—Proceed to non-standard adapter detection00
USB hostLOW100 mA01
USB hostHIGH500 mA01
Charging port—3 A10

When DCD 0.5 sec timer expires, the non-standard adapter detection is used to distinguish three different divider bias conditions on D+/D- pins. When non-standard adapter is detected, the input current limit (REG0[2:0]) is set based on the table shown below and REG08[7:6] is set to 10 (Adapter port). If non-standard adapter is not detected, REG08[7:6] is set to 00 (Unknown) and the input current limit is set in REG0[2:0] to 500 mA by default.

Table 9-2 BQ24297 Non-Standard Adapter Detection
NON-STANDARD
ADAPTER		D+ THRESHOLDD- THRESHOLDINPUT
CURRENT
LIMIT
Divider 1Vadpt1_lo < VD+ < Vadpt1_hi

For VBUS = 5 V, typical range 2.4 V < VD+ < 3.1 V		VD- < Vadpt1_lo or VD- > Vadpt1_hi

For VBUS = 5 V, typical range VD- < 2.4 V or VD- > 3.1 V		2.0A
Divider 2Vadpt2_lo < VD+ < Vadpt2_hi

For VBUS = 5 V, typical range 0.85 V < VD+ < 1.5 V		NA2.0A
Divider 3VD+< Vadpt3_lo or VD+> Vadpt3_hi

For VBUS = 5 V, typical range VD+ < 2.4 V or VD+ > 3.1 V		Vadpt3_lo < VD- < Vadpt3_hi

For VBUS = 5 V, typical range 2.4 V < VD- < 3.1 V		1A

After D+/D- detection is completed with an input source already plugged in, the input current limit is not changed unless DPDM_EN (REG07[7]) bit is set to force detection.