STA331 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STA331

High efficiency class D codec with integrated audio processing

STMicroelectronics 

Description

1

Description

STi1000

The STA331 device is a high-efficiency audio codec with an integrated ARM7TDMI® core

capable of running audio processing algorithms up to 75 MHz. The surrounding analog and

digital audio peripherals turn it in the ideal and flexible solution for mid-range sound-

processing applications, where final product differentiation is a must. The code runs off from

the embedded RAM, uploaded by an external serial flash and the whole set of audio

parameters and functionalities may be controlled via I2C or customizable GPIO interface

(for micro-less operation). Moreover, the widely adopted core allows for a fast porting of

third-parties audio effects, typically available on ARM® processors.

The high-efficiency Class-D codec embeds a stereo ADC, proprietary FFXTM PWM

modulator, and a powerful bridge in a single package, along with multi standard digital

connectivity and a 3-way selector on the input. Full muxing operations of multiple audio

sources are available. The PWM output may drive external power bridges, up to 2 x 100 W.

The software architecture is based on two main components, the Audio Socket Manager

(ASM) and the I/O Manager, turning the memory and processing capability of the

ARM7TMDI® core into a ready-to-use, yet fully customizable processing engine. The virtual

audio sockets allow a flexible selection of pre-compiled audio libraries and a transparent

uploading mechanism, on demand, from the external serial flash. A graphical AudioExplorer

GUI allows to browse and combine audio libraries out of the AudioEngine (AE) package, as

released by STMicroelectronics (see customization flow in Figure 1). Parameters tuning

along with other customizations (GPIO mapping, audio protocol and flow) result in a final

binary image ready to be downloaded into the final product.

The evaluation board, fully controllable by the GUI, allows for an immediate listening test of

the selected audio algorithms.

Third parties’ commercial algorithms are optionally available, through AE packages, in

evaluation mode (listening time typically limited to 3 min.). Porting of custom audio libraries

is possible as well, through Phoenix SDK (please contact STMicroelectronics for more

information).

Figure 1. Customization flow

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