OLIMEX A20-OLinuXino-MICRO User manual
A20-OLinuXino-MICRO
Open-source single-board
Android/ Linux mini-computer
U ER’ MANUAL
Revision G, October 2013
Designed by OLIMEX Ltd, 2013
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DISCLAIMER
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he information in this document is provided in connection with Olimex products. No license, express or implied
or otherwise, to any intellectual property right is granted by this document or in connection with the sale of
Olimex products.
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HERE IS NO WARRAN Y FOR HE DESIGN MA ERIALS AND HE COMPONEN S
USED O CREA E A20-OLINUXINO-MICRO. HEY ARE CONSIDERED SUI ABLE
ONLY FOR A20-OLINUXINO-MICRO.
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Table of Contents
DI CLAIMER ............................................................................................................. 2
CHAPTER 1: OVERVIEW ........................................................................................ 5
1. Introduction to the chapter ....................................................................................................... 5
1.1 Features ..................................................................................................................................... 5
1.2 arget market and purpose of the board ............................................................................... 6
1.3 Board variants .......................................................................................................................... 6
1.4 Board version used in the manual .......................................................................................... 6
1.5 Organization ............................................................................................................................. 6
CHAPTER 2: ETTING UP THE OLINUXINO BOARD ..................................... 8
2. Introduction to the chapter ....................................................................................................... 8
2.1 Electrostatic warning ............................................................................................................... 8
2.2 Requirements ........................................................................................................................... 8
2.3 Powering the board .................................................................................................................. 9
2.4 Button functions and NAND image restore in Android ..................................................... 10
2.5 Prebuilt software .................................................................................................................... 10
2.6 Calibrating a display .............................................................................................................. 11
2.7 Software support .................................................................................................................... 12
CHAPTER 3: A20-OLinuXino-MICRO BOARD DE CRIPTION ..................... 13
3. Introduction to the chapter ..................................................................................................... 13
3.1 Layout (top view) ................................................................................................................... 13
3.2 Layout (bottom view) ............................................................................................................. 14
CHAPTER 4: THE ALLWINNER A20 MICROCONTROLLER ....................... 15
4. Introduction to the chapter ..................................................................................................... 15
4.1 he microcontroller ............................................................................................................... 15
4.2 Block diagram ........................................................................................................................ 16
CHAPTER 5: CONTROL CIRCUITY ................................................................... 17
5. Introduction to the chapter ..................................................................................................... 17
5.1 Reset ........................................................................................................................................ 17
5.2 Clocks ...................................................................................................................................... 17
5.3 Power supply circuit .............................................................................................................. 17
CHAPTER 6: CONNECTOR AND PINOUT ...................................................... 18
6. Introduction to the chapter ..................................................................................................... 18
6.1 Communication with the A20 ............................................................................................... 18
6.1.1 U B-OTG communication (NAND firmware repair/update) .................................................................. 18
6.1.2 UART0, UEXT1, UEXT2 interface ............................................................................................................ 20
6.2 SD card connectors ................................................................................................................ 21
6.2.1 D/MMC1 slot .............................................................................................................................................. 21
6.2.2 D/MMC slot ................................................................................................................................................ 22
6.3 PWR jack ................................................................................................................................ 23
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6.4 MIC_IN & HEADPHONES connectors .............................................................................. 24
6.5 USB_O G connector ............................................................................................................. 25
6.6 USB_HOS connector ........................................................................................................... 26
6.7 Ethernet .................................................................................................................................. 27
6.8 HDMI connector .................................................................................................................... 28
6.9 VGA connector ....................................................................................................................... 29
6.10 SA A connector and power ................................................................................................. 30
6.11 GPIO-1 (General Purpose Input/Output) 14pin connector** ........................................ 31
6.12 GPIO-2 (General Purpose Input/Output) 40pin connector ............................................ 31
6.13 GPIO-3 (General Purpose Input/Output) 10pin connector ............................................. 33
6.14 LCD_CON 40pin connector ............................................................................................... 33
6.15 Jumper description .............................................................................................................. 35
6.16 Additional hardware components ...................................................................................... 35
CHAPTER 7: CHEMATIC .................................................................................. 37
7. Introduction to the chapter ..................................................................................................... 37
7.1 Eagle schematic ...................................................................................................................... 37
7.2 Physical dimensions ............................................................................................................... 38
CHAPTER 8: REVI ION HI TORY AND UPPORT ........................................ 39
8. Introduction to the chapter ..................................................................................................... 39
8.1 Document revision ................................................................................................................. 39
8.2 Board revision ........................................................................................................................ 40
8.3 Useful web links and purchase codes ................................................................................... 40
8.4 Frequently asked questions ................................................................................................... 41
8.5 Product support ..................................................................................................................... 44
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CHAPTER 1: OVERVIEW
1. Introduction to the chapter
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CHAPTER 2: ETTING UP THE OLINUXINO BOARD
2. Introduction to the chapter
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CHAPTER 3: A20-OLinuXino-MICRO BOARD DE CRIPTION
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CHAPTER 4: THE ALLWINNER A20 MICROCONTROLLER
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CHAPTER 5: CONTROL CIRCUITY
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CHAPTER 6: CONNECTOR AND PINOUT
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