SLVSFU7B July   2022  – April 2024 TPS929240-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Device Bias and Power
        1. 6.3.1.1 Power Bias (VBAT)
        2. 6.3.1.2 5V Low-Drop-Out Linear Regulator (VLDO)
        3. 6.3.1.3 Undervoltage Lockout (UVLO) and Power-On-Reset (POR)
        4. 6.3.1.4 Power Supply (SUPPLY)
        5. 6.3.1.5 Programmable Low Supply Warning
      2. 6.3.2 Constant Current Output
        1. 6.3.2.1 Reference Current with External Resistor (REF)
        2. 6.3.2.2 64-Step Programmable High-Side Constant-Current Output
      3. 6.3.3 PWM Dimming
        1. 6.3.3.1 PWM Generator
        2. 6.3.3.2 PWM Dimming Frequency
        3. 6.3.3.3 Blank Time
        4. 6.3.3.4 Phase Shift PWM Dimming
        5. 6.3.3.5 Linear Brightness Control
        6. 6.3.3.6 Exponential Brightness Control
      4. 6.3.4 FAIL-SAFE State Operation
      5. 6.3.5 On-Chip, 8-Bit, Analog-to-Digital Converter (ADC)
        1. 6.3.5.1 Minimum On Time for ADC Measurement
        2. 6.3.5.2 ADC Auto Scan
        3. 6.3.5.3 ADC Error
      6. 6.3.6 Diagnostic and Protection in NORMAL State
        1. 6.3.6.1  VBAT Undervoltage Lockout Diagnostics in NORMAL state
        2. 6.3.6.2  Low-Supply Warning Diagnostics in NORMAL State
        3. 6.3.6.3  Supply Undervoltage Diagnostics in NORMAL State
        4. 6.3.6.4  Reference Diagnostics in NORMAL state
        5. 6.3.6.5  Pre-Thermal Warning in NORMAL state
        6. 6.3.6.6  Overtemperature Protection in NORMAL state
        7. 6.3.6.7  Overtemperature Shutdown in NORMAL state
        8. 6.3.6.8  LED Open-Circuit Diagnostics in NORMAL state
        9. 6.3.6.9  LED Short-Circuit Diagnostics in NORMAL state
        10. 6.3.6.10 Single-LED Short-Circuit Detection in NORMAL state
        11. 6.3.6.11 EEPROM CRC Error in NORMAL state
        12. 6.3.6.12 Communication Loss Diagnostic in NORMAL State
        13. 6.3.6.13 Fault Masking in NORMAL state
        14.       53
      7. 6.3.7 Diagnostic and Protection in FAIL-SAFE states
        1. 6.3.7.1  Supply Undervoltage Lockout Diagnostics in FAIL-SAFE states
        2. 6.3.7.2  Low-Supply Warning Diagnostics in FAIL-SAFE states
        3. 6.3.7.3  Supply Undervoltage Diagnostics in FAIL-SAFE State
        4. 6.3.7.4  Reference Diagnostics in FAIL-SAFE states
        5. 6.3.7.5  Pre-Thermal Warning in FAIL-SAFE state
        6. 6.3.7.6  Overtemperature Protection in FAIL-SAFE state
        7. 6.3.7.7  Overtemperature Shutdown in FAIL-SAFE state
        8. 6.3.7.8  LED Open-Circuit Diagnostics in FAIL-SAFE state
        9. 6.3.7.9  LED Short-Circuit Diagnostics in FAIL-SAFE state
        10. 6.3.7.10 Single-LED Short-Circuit Detection in FAIL-SAFE state
        11. 6.3.7.11 EEPROM CRC Error in FAIL-SAFE State
        12. 6.3.7.12 Fault Masking in FAIL-SAFE state
        13.       Diagnostics Table in FAIL-SAFE State
      8. 6.3.8 OFAF Setup In FAIL-SAFE state
      9. 6.3.9 ERR Output
    4. 6.4 Device Functional Modes
      1. 6.4.1 POR State
      2. 6.4.2 INITIALIZATION state
      3. 6.4.3 NORMAL state
      4. 6.4.4 FAIL-SAFE state
      5. 6.4.5 PROGRAM state
    5. 6.5 Programming
      1. 6.5.1 FlexWire Protocol
        1. 6.5.1.1 Protocol Overview
        2. 6.5.1.2 UART Interface Address Setting
        3. 6.5.1.3 Status Response
        4. 6.5.1.4 Synchronization Byte
        5. 6.5.1.5 Device Address Byte
        6. 6.5.1.6 Register Address Byte
        7. 6.5.1.7 Data Frame
        8. 6.5.1.8 CRC Frame
        9. 6.5.1.9 Burst Mode
      2. 6.5.2 Registers Lock
      3. 6.5.3 Register Default Data
      4. 6.5.4 EEPROM Programming
        1. 6.5.4.1 Chip Selection by Pulling REF Pin High
        2. 6.5.4.2 Chip Selection by ADDR Pins Configuration
        3. 6.5.4.3 EEPROM Register Access and Burn
        4. 6.5.4.4 EEPROM PROGRAM State Exit
    6. 6.6 Register Maps
      1. 6.6.1 BRT Registers
      2. 6.6.2 IOUT Registers
      3. 6.6.3 CONF Registers
      4. 6.6.4 CTRL Registers
      5. 6.6.5 FLAG Registers
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Smart Rear Lamp with Distributed LED Drivers
      2. 7.2.2 Design Requirements
      3. 7.2.3 Detailed Design Procedure
      4. 7.2.4 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DCP|38
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.3.6.4 Reference Diagnostics in NORMAL state

The TPS929240-Q1 integrates diagnostics for REF resistor open and short fault. The device monitors the reference current I(REF) set by external resistor R(REF). The I(REF) can be calculated with the following equation.

Equation 7. GUID-34ECE104-058D-4E62-8D5F-E122987B072A-low.gif

where

  • V(REF) = 1.235 V typically

If the current output from REF pin I(REF) is lower than I(REF_OPEN_th), the reference resistor open-circuit fault is reported. The reference resistor short-circuit fault is reported if the voltage of REF pin V(REF) is lower than V(REF_SHORT_th). The device pulls the ERR pin down with constant current sink and set flag registers including FLAG_REF and FLAG_ERR to 1.

The fault is latched in flag registers. After the REF pin I(REF) and V(REF) recover to normal, the device releases ERR pin pulldown automatically and the master controller must send CLRFAULT to clear FLAG_REF and FLAG_ERR. The CLRFAULT automatically returns to 0.

In NORMAL state, the device does not perform any actions automatically when the reference resistor fault is detected. However, the output can not work properly and the output current can be operating at high current level. TI recommends for master controller to shut down the device outputs and report error to upper level control system such as Body Control Module (BCM).