TIDUF91 December   2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 DRV3901-Q1
  9. 3System Design Theory
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
    2. 4.2 Software Requirements
    3. 4.3 Test Setup
      1. 4.3.1 Hardware Setup
      2. 4.3.2 USB2ANY Explorer Setup
    4. 4.4 Test Results
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
      3. 5.1.3 PCB Layout Recommendations
        1. 5.1.3.1 Layout Prints
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
  12. 6About the Author

2.3.1 DRV3901-Q1

The DRV3901-Q1 is a highly integrated squib driver intended for automotive EV pyro-fuse applications. The device includes the power supplies, current sensing and regulation, and diagnostics and protection functions needed to drive a squib load. The DRV3901-Q1 incorporates several key functions unique to the device that are different from traditional squib drivers. These functions include a hardware pin trigger interface, an energy reservoir capacitor diagnostic, an addressable SPI, and optimized driver stage with integrated charge pump and additional deployment current options.

Key features of the DRV3901-Q1 include:

  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Compliant
    • Developed for functional safety applications
    • Documentation to aid ISO26262 system design up to ASIL C
  • Highly integrated squib driver design targeted at automotive EV pyro-fuse application
    • Integration of power supplies, current regulation, diagnostics, and safety functions
    • SPI or hardware pin-based triggering for flexible interface options and rapid firing reaction
    • Diagnostic functions for system energy reservoir capacitor and squib health monitoring
    • Built-in-self-test and diagnostic functions for power supplies, interfaces, drivers, and monitors
    • Architecture for reliable operation with redundant power supplies, low-side and high-driver drivers, and secondary monitoring logic
  • Up to 28V (40V absolute maximum) operating voltage
  • Compact HVSSOP-28 (DGQ) leaded package
  • Two-wire load interface with protected, current controlled high-side and protected secondary low-side switches
  • Integrated charge pump for minimal MOSFET drop out voltage
  • 4-wire, addressable, 24-bit SPI with CRC protection
    • Allows multiple device to operate on the same SPI
    • Allows for broadcast commands to multiple devices.
  • Configurable deployment currents (1.2A, 2ms; 1.75A, 0.5ms; up to 3.4A, 0.5ms)
  • Configurable deployment interface options
    • 2-pin HW trigger with PWM or level signaling
    • Protected SPI command with CRC
  • Comprehensive off-state diagnostics
    • Device built-in-self-test
    • Driver output and switch test
    • Interface test
    • Energy reservoir capacitor test
    • Squib resistance test
  • Configurable fault indicator (nFAULT)