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.
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 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
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
PT8921
IMPORTANT NOTICE
Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements,
improvements, and other changes to its products and to discontinue any product without notice at any time.
PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No
circuit patent licenses are implied.
Princeton Technology Corp.
2F, 233-1, Baociao Road,
Sindian, Taipei 23145, Taiwan
Tel: 886-2-66296288
Fax: 886-2-29174598
http://www.princeton.com.tw
PRE1.1
4
March 2010
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