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The AS3525 is an ultra low-power microcontroller based on the ARM9 32-bit
processor with fully integrated high performance audio features and system power
AS3525 is based on the ARM922 processor, with 16kB cache memories and
embedded 320K Byte SRAM with performance from 20 ~ 266MHz. The AS3525
features dedicated high speed interfaces for USB2.0 HS-OTG (AS3525A+B), ATA
IDE and SDRAM (AS3525A only) ensuring maximum performance for download,
upload, and playback.
Furthermore interfaces for NAND flashes, MMC/SD cards and Memory Stick
ensure most flexible system design possibilities. Hardware support for parallel
interfaces lower the CPU load serving complex and/or color user interfaces.
Additional serial high-speed data and control interfaces guarantee the connection
to other peripherals and or processors in the system.
Two independently programmable PLLs generate the required frequencies for
audio playback/recording, for the processor core and for the USB interface at the
same time. An additional external clock input eliminates the use of external
crystals when used in multi-processor systems.
It has a variety of audio inputs and outputs to directly connect microphones, and
auxiliary signal sources via a 10-channel mixer to a 16Ω / 32Ω headset, 4Ω
speaker or auxiliary audio peripherals.
Further the device offers advanced power management functions. All necessary
ICs and peripherals for an audio necessary system with flash or hard-disk
memory are supplied by the AS3525. The different regulated supply voltages are
fully programmable. The power management block generates 10 different supply
voltages out of a single battery supply. CPU, NAND flash, SRAM, memory cards,
LCD, LCD backlight and USB-OTG can be powered. When operating from a
single cell (AA or AAA) battery, the AS3525 can use a DCDC booster to generate
the needed system supply.
The AS3525 has an independent 32kHz real time clock (RTC) on chip, which
allows a complete power down of the system CPU and peripherals. AS3525 also
contains a charger for Li-Ion battery supply. The single supply voltage may vary
from 1.0V to 5.5V.
AS3525 is available in the following two variants:
13x13mm, 224 pins in a CTBGA package (AS3525A)
10x10mm, 144 pins in a CTBGA package (AS3525B)
No IDE Host Interface
No External Memory Interface
Both packages are RoHS-compliant.