AS3531

The AS3531 is austriamicrosystems new generation SoC for portable digital audio products. Its highly flexible architecture allows single chip solutions for high performance and ultra low power audio products with minimum count of external components.

Using low power process technologies with ultra low leakage currents provides an outstanding performance of AS3531 in terms of power consumption and utmost integration densities for embedded on-chip RAM and ROM areas.

The AS3531 integrates a powerfull Audio Engine that enables lowest possible system clock rates for audio decoding. This audio engine supports all common audio decoding standards: MP3, AAC+ and WMA. Together with the audio postprocessor this enables devices with less than 15 mW power consumption for typical audio playback use cases.

The AS3531 contains all digital functions together with the audio analog frontend (AFE) and all necessary power management blocks.

These function blocks of AS3531 include on-chip RAM and ROM memories, interface blocks for data transfer and storage like USB, NandFlash, MMC, SD, SDIO, CE-ATA, GPIO, SSP, clock generation and digital power optimisation functions.

austriamicrosystems AS3531 provides a total system solution reference design including all necessary software blocks for low level HW drivers, device IO functions and a dedicated reference application with a feature rich set of audio functions.

The AS3531 contains an ultra low power stereo audio codec. It allows playback in higher than CD quality and recording in FM quality. It has a variety of audio inputs and outputs to directly connect electret microphones, 16 /32 headsets and auxiliary signal sources via a 3-channel mixer.

Further AS3531 offers advanced power management functions. All necessary ICs and peripherals in a Digital Audio Player are supplied by the included AFE. The different regulated supply voltages are programmable via the serial control interface. The AFE  AS3531 also contains a Li- Ion battery charger. The single supply voltage may vary from 2.7V to 5.5V.

The AFE AS3531 has an independent 32kHz real time clock (RTC) on chip which allows a complete power down of the system CPU.