PT8401 Datasheet, PDF (5/28 Pages) Princeton Technology Corp – MP3 Audio Decoder

Princeton Technology Corp.
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URL: http://www.princeton.com.tw
MP3 Audio Decoder
PT8401
Pin Name
BCK1
GPIO4
GPIO3
GPIO2
GPIO1
GPIO0
MCLKO
VSS
PWRDWN_
DSPRDY
PVDD
PVSS
FILT
I/O
I
I/O
I/O
I/O
I/O
I/O
O
Power
I
O
Power
Power
Passive
Description
First Serial Input Clock
General Purpose IO4 or Start-Up Configuration
General Purpose IO3 or Start-Up Configuration
General Purpose IO2 or Start-Up Configuration
General Purpose IO1 or Start-Up Configuration
General Purpose IO0 or Start-Up Configuration
Master Oversampling Clock Output for DAC
Digital Supply Ground
Power Down Control
Decoder Operation Ready
Digital Supply Positive for PLL
Digital Supply Ground for PLL
Connect to Capacitor 820pF.
Pin No.
32
33
34
35
36
37
38
39
40
41
42
43
44
Functional Description
System and Interface Description
PT8401 is capable of decoding MPEG audio bitstream through a serial data interface. With proper external
A/D converter, it is capable of encoding audio signal by the ADPCM Method. The primary operating mode
of PT8401 is divided into three sections: MP3 Decoder, ADPCM Encoder and ADPCM Decoder.
MP3 Decoding Mode: The bitstream input may either be from the first serial bitstream interface or parallel
bitstream interface depending on the SP_SEL command. After processing, the audio data is outputted
through the serial output interface. The controller can get bitstream information through GPIO or I²C
interface even while the process is still in operation.
ADPCM Encoding Mode: By connecting additional A/D to the second serial data interface and by
issuing several basic commands like SetMode and AdpcmMode via I²C or GPIO, PT8401 can start
ADPCM encoding, bitstream output through GPIO. Please refer to the Start-up Configuration and GPIO
Setting Section for detailed timing diagram.
PT8401 v 1.3
Page 5
Updated March 2002