Ruigu Electronic

Power Domain Descriptor (PDD)

A structured data format or metadata component used in electronic systems (especially embedded systems and integrated circuits) to define and manage power domains—distinct regions of a device that share a common power supply, voltage level, or power management policy.

Core Functions

• Power Domain Definition: Specifies attributes of a power domain, such as voltage ranges (e.g., 1.8V, 3.3V), current limits, and power states (active, idle, standby, off).
• Dependency Mapping: Outlines relationships between power domains (e.g., which domains must remain active to support a critical audio codec like CXD).
• Management Instructions: Provides rules for power transitions (e.g., how to safely switch a domain from active to low-power mode without disrupting audio signal processing).

Applications in Audio/Electronic Systems

• Chip-Level Power Management: Used in audio codec chips or DSPs to partition hardware modules (e.g., ADC, DAC, PLL) into separate power domains, enabling selective power gating to reduce energy consumption.
• Embedded Audio Devices: Helps firmware manage power distribution in portable devices (e.g., wireless headphones), ensuring audio processing blocks stay powered while non-essential domains enter low-power states to extend battery life.

PDDs enable efficient, context-aware power control, critical for balancing performance and energy efficiency in audio electronics.