company blog about Recycle Allwinner Analog Series Chip:PMU,Audio Codec

Recycle Allwinner Analog Series Chip:PMU,Audio Codec

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Power Management Unit (PMU): The Efficient and Stable ‘Energy Steward’

Allwinner's PMU products, centred on the AXP series and independently developed by wholly-owned subsidiary Xinzhihui, have become the preferred power solution for embedded systems and portable devices. This is achieved through core advantages of high integration, low power consumption, and multi-scenario adaptability. Their core value lies in precisely allocating power resources, dynamically matching device load demands, while incorporating comprehensive safety protection mechanisms to safeguard stable device operation.

Core Technical Features Analysis

Allwinner's AXP series PMU chips employ a highly integrated design, with a single chip providing multiple DC-DC converters and LDO (low dropout linear regulator) outputs. This enables simultaneous stable voltage supply to multiple core modules such as CPU, GPU, memory, and display. For instance, the flagship AXP707 integrates six DC-DC converters and fifteen LDOs, supporting maximum input voltages up to 7.0V and charging currents of 2.8A, meeting the power demands of high-performance devices. Conversely, the AXP2101 employs a compact QFN-5×5-40-EP package with five linear DC-DC converters, making it ideal for miniaturised smart devices.

Dynamic power optimisation constitutes one of Allwinner PMU's core competitive strengths. The series universally supports Dynamic Voltage and Frequency Scaling (DVFS) technology, enabling real-time adjustment of supply voltage and current according to device operational load. This maximises power efficiency while maintaining performance, significantly extending battery life. Select premium models further incorporate the unique E-Gauge™ fuel gauge system, which precisely monitors battery capacity, voltage, and charge/discharge status, providing accurate data support for device power management.

Regarding safety protection, Allwinner PMU chips incorporate multiple safeguards including overvoltage protection (OVP), undervoltage protection (UVP), overcurrent protection (OCP), and overtemperature protection (OTP). These effectively address abnormal power scenarios, preventing device damage from electrical faults. Additionally, the product supports multiple power path management architectures such as IPS or NVDC, accommodating various lithium battery types (lithium-ion/lithium-polymer). Its battery voltage support range spans 4.0V to 5.0V, ensuring compatibility with mainstream battery specifications.

Typical Models and Application Scenarios

The Allwinner AXP series PMUs feature differentiated designs tailored to diverse application scenarios, forming a comprehensive product portfolio spanning high, mid, and low-end segments. The AXP221S, a fully integrated single-cell buck IPS power management unit in QFN-8*8-68-EP packaging, supports 2A charging current and 14 LDO outputs. Its outstanding compatibility enables widespread adoption in tablets, educational devices, and smart home hubs. Available for standalone purchase, it offers flexible solutions for non-Allwinner SoC implementations.

The AXP717 employs an NVDC power path architecture, elevating charging current to 3A while supporting a broad 4.0V-5.0V battery voltage range. It incorporates a backup battery interface, specifically engineered for industrial control terminals and portable medical devices demanding exceptional power stability. Currently sold primarily in combination with Allwinner SoCs, it ensures optimal overall system performance. Within smart wearables, the PMU solution paired with Allwinner's ZT7103S chip has become the core power module for smartwatches and health monitoring devices. Its low-power design and compact packaging support multiple low-power modes, delivering over 30% improved battery life.

Audio Codecs: The “Auditory Core” Restoring Pure Sound Quality

Allwinner's audio codecs excel in high signal-to-noise ratio, low power consumption, and high integration. Available as standalone chips or SoC-integrated solutions, they are widely deployed in smart voice interaction, audio-video playback, and voice calling applications. Beyond precise analogue-to-digital conversion, they deliver immersive audio experiences through hardware-level optimisation while supporting diverse audio interfaces and formats to meet varied device requirements.

Key Performance and Technical Highlights

Allwinner's audio codec employs advanced multi-bit incremental-Sigma modulation technology, significantly enhancing signal conversion precision. Taking the audio codec integrated within Allwinner's R128 series SoCs as an example, its DAC playback path achieves a maximum signal-to-noise ratio of 119dB (A-weighted filtering), while the ADC recording path reaches 98dB. This effectively suppresses noise interference, restoring clear and refined audio quality. For voice interaction scenarios, select models integrate HiFi5 audio DSPs, supporting multiple audio algorithm optimisations to enhance speech recognition accuracy.

Regarding compatibility and expandability, Allwinner audio codecs support the full range of sampling rates from 8kHz to 48kHz, compatible with various audio interfaces including I2S, PCM, and TDM. This enables connection to diverse audio peripherals such as digital microphones, speakers, and headphones. Certain high-end models, such as the AXP813 (a composite chip integrating PMU and audio codec), incorporate a digital phase-locked loop. This generates a stable audio clock from either standard audio crystal rates or common reference clock frequencies, accommodating diverse system design requirements. It even supports continuous voice call operation whilst the application processor remains in sleep mode.

Low-power design remains a core strength of Allwinner's audio codecs. Through optimised circuit architecture and dynamic power management techniques, chip power consumption can be reduced to the microampere level in sleep mode, perfectly meeting the low-power requirements of smart wearables and battery-powered IoT devices. Additionally, select models incorporate Automatic Level Control (ALC) functionality, which automatically adjusts gain based on input signal strength to prevent audio distortion and enhance playback and recording stability.

Product Form Factors and Application Scenarios

Audio codecs primarily serve the market in two forms: integrated within SoC chips to provide integrated solutions for specific scenarios, or as standalone chips offering flexible options for devices requiring high-performance audio processing. Within the smart IoT sector, the audio codecs embedded in Allwinner's R128 series SoCs, featuring multi-channel ADC/DAC designs, serve as core audio modules for smart speakers, smart home controllers, and service robots. They support functions such as voice wake-up, audio playback, and ambient sound capture.

Within smart wearables and portable devices, audio codecs integrated into chips like the ZT7103S, through compact design and low-power optimisation, suit products such as smartwatches and children's location-tracking watches, supporting core functions including call recording and voice announcements. Standalone audio codecs find extensive application in portable audio systems, professional recording equipment, and industrial voice terminals. Their high signal-to-noise ratio and flexible interface design meet demanding professional audio processing requirements. Notably, integrated solutions like the AXP813 combine power management with audio codec functionality, significantly simplifying system design and reducing bill-of-materials costs. This makes them the preferred choice for high-end smart devices.