Preliminary

PT8921

Smart Audio Combo-Station with USB

Mini-Host & SD/MMC Host Interface Controller

DESCRIPTION

The PT8921 is a cost-efficient single chip for audio

mini-combo play-station application. The chip integrated

the USB2.0 FS host controller, SD/MMC host controller,

Sigma-Delta

Audio-DAC

and

WAV/MP3/WMA/AAC

Audio-Decoder in one chip. Only few external components

needed in application circuits makes it suite for the audio

play-station system with USB2.0 FS host, SD/MMC host

and i-Pod audio control interfaces.

The I/O interfaces are totally following the USB2.0 FS host

class

interface

specification

and

SD/MMC

card

specification. The stand alone audio play-station and no

special driver software need to install on this system by

user in the recent market. The PT8921 is a truly plug and

play audio play-station controller with USB2.0 FS host and

SD/MMC host interfaces. There are some extended

functions for the different audio sources and applications.

The embedded 8 pins provide the player function key and

other adjustment feature. The 5 GPIO-pins support the

other control function for customer application.

APPLICATIONS

• Portable Audio Play-Station

• Car Audio Combo-Station

• Home Audio Play-Station

FEATURES

• Built-in USB 2.0 FS Mini-Host interface.

• Compliant with USB Mass-storage class specification.

• Built-in SD/MMC Host interface.

• Compliant with SD/SDIO Card specification Version 2.0.

• Compliant with MMC Card specification Version 4.2.

• Support FAT12, FAT16 and FAT32 file system.

• Built-in 8051 base MCU with 8K ROM.

• Support ISP (In-System-Programmable) Interface for

external program Flash-ROM.

• Built-in WAV/MP3 WMA/AAC Format Audio-Decoder.

• Support MPEG1/2/2.5 layer III audio decoding.

• Built-In Flat/Pop/Jazz/Classic/Rock processing function.

• Built-In Digital Volume control function

• Built-in SNR=85dB (A-Weighted) Sigma-Delta DAC,

PWM Output.

• Built-in IIC Master/Slave Control Interface.

• Built-in UART Interface to communicate with i-Pod.

• Built-in external IIS input for optional audio input

sources, and support one IIS output connecting an

external advanced audio controller or stand-alone

sigma-delta DAC controller.

• Packages: 100 Pins LQFP

BLOCK DIAGRAM

USB 2.0

FS-PHY

PLL

& Slave

Regulator

DMA

MCU

8051

RAM

ROM

SFR

GPIO

MP3/WMA/AAC

Decoder

Host

SIE

PWM_LP/LN

PWM_RP/RN

Power

DP

DM

UART

VCC

GPIO

System Clks

Data

FIFO

Parallel

Flash I/F

SD/MMC

Host I/F

PLL

12 MHz

Master Clks

Delta

Sigma

DAC

Reset

Reset

POR

PCM-Data

PCM-Data (WAV)

External Program

Flash-Memory

SD/MMC

Card

PWM_OUT

Audio

Buffer