Description
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
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 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 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 the device 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 also contains a Li-
Ion battery charger. The single supply voltage may vary
from 2.7V to 5.5V.
The AFE has an independent 32kHz real time clock
(RTC) on chip which allows a complete power down of
the system CPU. |
