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-GPIO pins provide the
player function key and other adjustment feature.
FEATURES
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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 I
2
C Master/Slave Control Interface.
Built-in UART Interface to communicate with i-Pod.
Built-in external I
2
S input for optional audio input
sources, and support one I
2
S output connecting an
external advanced audio controller or stand-alone
sigma-delta DAC controller.
Packages: 100 Pins LQFP
APPLICATIONS
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Portable Audio Play-Station
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Car Audio Combo-Station
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Home Audio Play-Station
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BLOCK DIAGRAM
I
2
S_INPUT
I
2
S_INPUT
DP
DM
USB 2.0
FS-PHY
Host
SIE
DMA
Data
FIFO
PWM_LP/LN
Delta
Sigma
DAC
PWM_RP/RN
I
2
S Stream
PCM-Data (WAV)
PWM_OUT
IC
UART
2
I
2
C Master
& Slave
MCU
8051
Power
SFR
Audio
MP3/WMA/AAC
PCM-Data
Buffer
Decoder
I
2
S_OUT
VCC
Regulator
System Clks
RAM
ROM
GPIO
Parallel
Flash I/F
SD/MMC
Host I/F
Reset
POR
Reset
Master Clks
PLL
PLL
12 MHz
GPIO
External Program
Flash-Memory
SD/MMC
Card
Tel: 886-66296288
‧
Fax: 886-29174598
‧
http://www.princeton.com.tw
‧
2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
PTC [ PRINCETON TECHNOLOGY CORP ]
