AVT2 RC2 Reference Board

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English ‪中文(台灣)‬

AVT2 RC2 is a KiCad version of AVT2 RC1 reference board, also fixed some known issues in RC1.

SCHEDULES

AVT2 RC2 Schedules

FEATURES

• 336 MHz XBurst Jz4720 MIPS­compatible CPU
• display: 8­bit RGB / ITU 656/601 data format input of TFT display.
• dimension (mm): 94.5 x 65
• DRAM: 64MB Synchronous DRAM
• headphone jack (3.5 mm)
• SDHC microSD
• support 850mAh charge limited 4.2V Li­ion battery
• 2GB NAND flash memory
• mini­USB: USB 2.0 High­Speed Device
• micro­AB USB: USB 1.1 Host
• serial console
• speaker and microphone
• 58 Keys

DESCRIPTIONS of BLOCK

SDRAM

This board has finally 64MB SDRAM with one chip U8 Micron MT48LC32M16A2P­75.

NAND FLASH

This board has SAMSUNG 2GB U9 K9GAG08U0M­PCB0.

USB INTERFACE

There has one USB 1.1 host port with micro­AB receptacle connector(J4), one USB 2.0 device port on main board (J2).

AUDIO SYSTEM

JZ4720 provides internal CODEC is an I2S/AC97 audio CODEC with 18 bits DAC and 16 bits ADC. The audio system of this design makes use of the internal CODEC to implement the input and output of audio. It consists of MIC­in with two solder pastes MIC+1 and MIC­-1, headphone jack J3, an amplifier U10 GPY0030B for external speaker connecting to the solder paste SP+1 and SP­1. When plug a headphone in J3, the amplifier will be off. The audio system provides record with gain control; stereo headphone output with bass/treble boost, and output volume control by software.

KEYBOARD INTERFACE

There are 58 keys reserved by software control. An another ON/OFF key S9 connected to pin 124 WAKEUP_/PD29 of jz4720. A reset key S1 connected to pin 123 PPRST_ of jz4720. When this pin receives Low, the cpu will start a reset procedure.

MICRO­SD CARD SOCKET

J1 is the MICRO­SD card socket for extension memory.

LCD INTERFACE

CON2 can let you connected with 24pins of FPC to support 8­bit RGB / ITU 656/601 data format input of TFT display.

CHARGING STATUS LED

LED D3 indicates the charge status that light when charging.

BOOT SELECT SWITCH

SW1 can be switched to either USB BOOT mode or NAND FLASH BOOT mode.

SERIAL CONSOLE

CON3 is a serial console with 3 terminals in RXD/TXD/GND fuctionality which can communicate with jz4720.

JTAG TEST POINTs

There are 5 test points TP1~5 reserved for JTAG interface.

UART PORT

There is another uart port reserved which shares pins with JTAG interface.

TOUCH SCREEN INTERFACE

XP/XN, YP/YN reserved inputs for touch screen connection option.

PROJECT SITE

http://projects.qi-hardware.com/index.php/p/board-qi-avt2/

CHANGE HISTORY

1. changed U12 Linear LTC3529EDCB to Kingbor KB3436 for cost down

2. changed BD4 into Sunlord ferrite bead PZ1608D221TF and BN1/BN2 changed into Sunlord ferrite bead array ARZ3216­4­601 to pass FCC test.

3. used ST USBDF01W5 for EMI Filter and line termination for USB host downstream ports functionality

4. added CON4P1 footprint available on battery cave for touch screen connection

5. moved SW1 boot slide switch to the left front side and changed to a smaller one

6. added 0.1uF/16V/C0402 between U6 pin1 and pin2 for ESD elimination

7. added R60 100K/5%/R0603 pull high resistor for solving no action during serial connection

SCHEMATIC

qi_avt2_RC2.pdf

BOM

avt2_RC2_bom.ods

PCB & GERBER/DRILL FILES

This project is moving on. If you want to see the pcb and gerber files by free Kicad tool, you can check following url ink to see current newest status. http://projects.qi-hardware.com/index.php/p/board-qi-avt2/

LAYOUT NOTES

• Layout notes avt2 RC2 20091116
• Layout notes avt2 RC2 20091207
• Layout notes avt2 RC2 20091230
• Layout notes avt2 RC2 20100122
• Layout notes avt2 RC2 20100126
• Layout notes avt2 RC2 20100202

KNOWN ISSUES

Category:Reference Design Board