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<p> <?tk 2?>Electromagnetic interference (EMI) suppression is critical in automotive electronics to ensure compliance with CISPR 25 - a standard established by the International Special Committee on Radio Interference - which governs conducted and radiated emissions in vehicles across the 76–108 MHz FM band. This paper introduces a software-based adaptive tuning method for Spread Spectrum Clock Generator (SSCG) parameters, aimed at mitigating conducted EMI in real time. The proposed gradient-based algorithm dynamically adjusts the modulation cycle and depth to optimize spectral spreading while preserving system clock integrity. Detailed experimental setups are provided, including conducted EMI measurements performed with both Quasi-Peak and Average detectors over the full 150 kHz–108 MHz range, following CISPR 25 guidelines. The system was tested on a practical automotive platform, and the adaptive tuning process demonstrated significant EMI reduction—up to 13 dB at critical frequency points—without requiring hardware modifications. Specific SSCG register configurations, initial and final parameter states, and the iterative tuning flow are comprehensively explained to clarify the mechanism of adaptive EMI suppression. This cost-effective approach offers scalability and real-time adaptability, making it suitable for integration into modern automotive and embedded systems. The results highlight the potential for firmware-level EMI control to complement traditional hardware-based mitigation strategies, contributing to more robust and flexible EMI compliance solutions.</p>

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Firmware-Driven Adaptive Clock Tuning for Electromagnetic Interference Tolerance in Automotive Systems

  • 期刊论文

  • 发表日期：

    2025年8月22日

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  • Zong-Si Wu,
  • Jenq-Shiou Leu

摘要

Electromagnetic interference (EMI) suppression is critical in automotive electronics to ensure compliance with CISPR 25 - a standard established by the International Special Committee on Radio Interference - which governs conducted and radiated emissions in vehicles across the 76–108 MHz FM band. This paper introduces a software-based adaptive tuning method for Spread Spectrum Clock Generator (SSCG) parameters, aimed at mitigating conducted EMI in real time. The proposed gradient-based algorithm dynamically adjusts the modulation cycle and depth to optimize spectral spreading while preserving system clock integrity. Detailed experimental setups are provided, including conducted EMI measurements performed with both Quasi-Peak and Average detectors over the full 150 kHz–108 MHz range, following CISPR 25 guidelines. The system was tested on a practical automotive platform, and the adaptive tuning process demonstrated significant EMI reduction—up to 13 dB at critical frequency points—without requiring hardware modifications. Specific SSCG register configurations, initial and final parameter states, and the iterative tuning flow are comprehensively explained to clarify the mechanism of adaptive EMI suppression. This cost-effective approach offers scalability and real-time adaptability, making it suitable for integration into modern automotive and embedded systems. The results highlight the potential for firmware-level EMI control to complement traditional hardware-based mitigation strategies, contributing to more robust and flexible EMI compliance solutions.