USB Host MP3 Decoder SoC
1 PRODUCT OVERVIEW
AX20XX is an 8051 Compatible high performance mixed signal 8-bit microcontroller. It
integrates advanced digital and analog peripherals to suit for a variety of applications. For
digital peripherals, it supports a variety of digital interfaces including UART, SPI0 and
SPI1, four timers, integrates an USB 2.0 full speed OTG controller and a MP3 Decoder
Engine. For analog peripherals, it integrates RTCC, DAC, ADC, PLL-based clock
generator, a low voltage detector and two low dropout voltage regulator.
The microcontroller employs an advanced RISC-based architecture and compatible with
standard 8051 with throughput of up to 48MIPS. All instructions are single-cycled except
program branching.
1.1 Features
•Low power 0.18um CMOS technology
•Power supply 1.8V/3.3V, power consumption 80mW
•Enhanced 8051 with throughput up to 48MIPS
•Dynamic MCU running clock frequency adjustment to reduce power consumption and EMI
•USB2.0 full-speed host controller
•SD/MMC card controller
•Support MPEG-1, MPEG-2, MPEG-2.5 Audio Layer 1, 2, 3 decoder under 24MHz
•Support three low-power saving modes: IDLE mode, HOLD mode and SLEEP mode.
•32 GPIO pins for various purposes
•Support external SPI flash
•On-chip In-System Programming (ISP) and In-System Debugging (ISD)
•Supports flexible I/O with different programmable capabilities like pull-up/wake-up
•Support 9 sampling rates: 8kHz / 11.025kHz / 12kHz / 16kHz / 22.05kHz / 24kHz / 32kHz / 44.1kHz / 48KHz
•Embedded sound equalizer
•Support FAT12/FAT16/FAT32 file system
•Embedded 16-bit sigma-delta audio DAC with SNR at 79 dB
•Support IR Remote Control
•Embedded 32KB OTP memory for program storage
1.2 Application
•MP3 Audio System
1.3 System Architecture
1.4 Electrical Characteristics Table 1-1: Absolute maximum ratings
Table 1-2: Electrical Characteristics (Standard testing condition at 25o
C)
Table 1-3: DAC Characteristics (Standard testing condition at 25o
2 PIN DEFINITIONS
2.1 Pin Assignment
timeout on t2 timer2.2 Pin Descriptions Table 2-1: Pin Descriptions
9P01I/O GPIO
ADC Input T2CAP: Timer2 Capture Pin SPI0CLKA: SPI0 Clock(A)
10P00I/O GPIO
ADC Input
LVD: Low voltage detect input
11P37I/O GPIO
ADC Input
AUXL0UARTRX1: UART Data In(B) T3PWM:Timer3 PWM Output
12P36I/O GPIO
AUXL1
SDDATA3: SD Data 3
13DACVSS P DAC Ground
14DACL O DAC Left Channel
15VCM O DAC Bandgap voltage reference
16DACR O DAC Right Channel
17DACVDD P DAC Power
18P35I/O GPIO
AUXR0
UARTTX1: UART Data Out(B)
19P34I/O GPIO
AUXR1
SDDATA2: SD Data 2
20P33I/O GPIO SDDATA1: SD Data 1
21P32I/O GPIO SDDATA0: SD Data 0
22P31I/O GPIO SDCMD: SD Command
23P30I/O GPIO SDCLK: SD Clock
24P17I/O GPIO PPWR: Parallel Port Write
T2CKIN: Timer2 Clock In
25P16I/O GPIO UARTTX0: UART Data Out(A)
T3CAP: Timer3 Capture Pin 26MCLR/VPP I Master Clear, Low Active OTP Programming Power
27P15/OSC32KI I/O GPIO
32K Oscillator Input
T3CKIN: Timer3 Clock In
28P14/OSC32KO I/O GPIO
32K Oscillator Output T2PWM: Timer2 PWM Output SPI1DIB: SPI1 Data B In
29P13I/O GPIO DP: Debug Pin
30P12I/O GPIO SPI1DIA: SPI1 Data A In
SPI0DIB: SPI0 Data In(B) 31P11I/O GPIO SPI1DO: SPI1 Data Out
SPI0DOB: SPI0 Data Out(B) 32USBDM I/O USB Negative Input/Output
33USBDP I/O USB Positive Input/Output
34VSSIO P IO Ground
35LDOVDD P LDO Power
36VDDIO P IO Power
37P10I/O GPIO SPI1CLK: SPI1 Clock
SPI0CLKB: SPI0 Clock(B) 38P27I/O GPIO PPD7: Parallel Port Data 7 39P26I/O GPIO PPD6: Parallel Port Data 6 40P25I/O GPIO PPD5: Parallel Port Data 5 41P24I/O GPIO PPD4: Parallel Port Data 4 42P23I/O GPIO PPD3: Parallel Port Data 3 43P22I/O GPIO PPD2: Parallel Port Data 2

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