Noise-Immune

Power Management:

// Leverage active-low for maximum noise immunity
void configure_noise_immune_power_management() {
    LowPowerRequestConfig config;
 
    // Active-low provides excellent noise immunity
    config.polarity = LowPowerRequestPinPolarity::LOW_TRUE_POLARITY;
    config.enable = true;
    config.override = LowPowerRequestOutputOverride::NOT_FORCED;
 
    configure_low_power_request(&config);
 
    // Benefits of active-low in noisy environments:
    // - Active state is ground-referenced (0V) - immune to VDD noise
    // - Inactive state maintained by pull-up - resistant to ground bounce
    // - External circuits can use Schmitt trigger inputs for hysteresis
    // - Less susceptible to EMI-induced false triggering
}

註

PMIC Compatibility: Most commercial PMICs expect active-low enable/control signals:

• Texas Instruments power management ICs
• Analog Devices power management solutions
• Maxim Integrated power management devices
• STMicroelectronics power management circuits

Power Optimization Benefits: LOW_TRUE_POLARITY provides power advantages:

• Inactive state (majority of operation time): Low current through pull-up
• Active state (during low power modes): Pin sinks current, PMIC reduces power
• External pull-up can be optimized for power vs. speed trade-off
• Compatible with power-gating and supply sequencing schemes

警告

External Component Requirements:

• Requires external pull-up resistor (typical values: 10kΩ - 100kΩ)
• Pull-up resistor value affects signal rise time and power consumption
• Verify external circuit input current requirements
• Ensure adequate current sink capability for reliable low state

註

Design Recommendations:

• Use external pull-up resistor appropriate for application speed requirements
• Verify VDD - 0.4V meets external circuit high-level input requirements
• Test signal integrity with actual external circuit loading
• Consider using Schmitt trigger inputs on external circuits for noise immunity
• Document pull-up resistor value selection rationale for maintenance