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www.eurotech.com
USER MANUAL
BitsyXb
PXA270 Single Board Computer
Rev A – August 2011 – 110118-0001A
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Issue no.
PWB
Date
Comments
2 Oct-2005
Preliminary release
3 Nov-2005
Second preliminary release
A Aug-2011
Initial release
Disclaimer
The information in this document is subject to change without notice and should not be construed as a commitment
by any Eurotech company. While reasonable precautions have been taken, Eurotech assumes no responsibility for
any error that may appear in this document.
Trademarks
All product or service names are the property of their respective owners.
Revision History
Eurotech style and format
© 2005 Eurotech Inc.
For contact details, see page 22.
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Contents
Contents
1 Introduction ....................................................................................................................................... 7
1.1 Overview ............................................................................................................................... 7
1.2 Features.................................................................................................................................. 7
1.2.1 Processor...................................................................................................................... 7
1.2.2 Power Supply ............................................................................................................... 7
1.2.3 Memory ....................................................................................................................... 7
1.2.4 Communications .......................................................................................................... 8
1.2.5 User Interface and Display .......................................................................................... 8
1.2.6 I/O ................................................................................................................................ 8
1.2.7 Audio Interface ............................................................................................................ 8
1.3 Block Diagram ....................................................................................................................... 9
2 Getting Started ................................................................................................................................ 10
2.1 Development Systems ......................................................................................................... 10
2.1.1 System Components .................................................................................................. 10
2.1.2 BitsyXb Personality Boards ....................................................................................... 10
Eurotech CompactFlash Personality Board
Eurotech Ethernet Personality Board
Eurotech Quad UART Ethernet Personality Board
2.2 Frequently Asked Questions ................................................................................................ 11
2.3 Errata, Addenda and Further Information ............................................................................ 12
3 Hardware Reference ........................................................................................................................ 13
3.1 Switches, Controls and Indicators ....................................................................................... 13
3.1.1 S1: DIP Switch ......................................................................................................... 13
3.1.2 LED Indicator ............................................................................................................ 13
3.2 Jumper Settings ................................................................................................................... 13
3.2.1 JP2: LCD Display Power Select ............................................................................... 14
3.3 Signal Connectors ................................................................................................................ 14
3.3.1 J1: LCD Panel Interface Connector .......................................................................... 15
3.3.2 J2: PCMCIA ............................................................................................................. 16
3.3.3 J3: Power, I/O, Serial 2 & 3, USB, Touch Screen and others ................................... 16
3.3.4 J6: Input Power ......................................................................................................... 17
3.3.5 J7: I2C and SD/MMC ............................................................................................... 18
3.3.6 J8: Vee Adapter ........................................................................................................ 18
3.3.7 J9: External CompactFlash / Expansion Bus ............................................................ 19
3.3.8 J10: ADSmartIO, USB, Serial 1, Stereo Audio, I/Os ............................................... 20
3.3.9 J11: Supercapacitor Input ......................................................................................... 21
3.3.10 J16: In-System Programming ................................................................................... 22
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4 Feature Reference ........................................................................................................................... 23
4.1 System Architecture ............................................................................................................ 23
4.1.1 Boot Code .................................................................................................................. 23
4.1.2 Synchronous DRAM ................................................................................................. 23
4.1.3 Non-Volatile Memory ............................................................................................... 23
Flash Memory
ADSmartIO EEPROM
CompactFlash and PCMCIA/ATA Cards
RTC NVRAM
4.1.4 Interrupts.................................................................................................................... 24
4.1.5 CompactFlash / Expansion Bus ................................................................................. 24
4.1.6 PXA270 GPIO Cross-Reference ............................................................................... 24
4.2 Real-Time Clock (RTC) ...................................................................................................... 27
4.3 ADSmartIO .......................................................................................................................... 27
4.3.1 Overview ................................................................................................................... 27
4.3.2 ADSmartIO Features ................................................................................................. 28
4.3.3 Digital I/Os ................................................................................................................ 28
4.3.4 Analog Inputs (A/D) .................................................................................................. 28
4.3.5 Temperature Sensing ................................................................................................. 28
4.3.6 Keypad Scan .............................................................................................................. 29
4.3.7 ADSmartIO Signal Cross-Reference ......................................................................... 30
4.4 Audio ................................................................................................................................... 31
4.4.1 Microphone Pre-amps ................................................................................................ 31
4.4.2 Audio Outputs: Speakers and Headphones ................................................................ 31
Connecting Speakers
Connecting Headphones
Using Stereo Headphones and Speakers in the Same System
4.5 Buses and Data Communications ........................................................................................ 32
4.5.1 Serial Ports................................................................................................................. 32
4.5.2 USB ........................................................................................................................... 33
USB Host
USB Function (Client)
4.5.3 Synchronous Serial Ports ........................................................................................... 34
Overview of Synchronous Serial Ports
SSP on the PXA270
SSP on the BitsyXb
4.5.4 I2C Bus Master........................................................................................................... 35
I2C on the BitsyXb
4.5.5 Secure Digital (SD/SDIO) and Multimedia Card (MMC) Controller ....................... 37
4.6 Displays ............................................................................................................................... 38
4.6.1 Display Types Supported ........................................................................................... 38
4.6.2 LCD Voltages ............................................................................................................ 38
4.6.3 Display Signals .......................................................................................................... 38
4.6.4 Creating Display Cables ............................................................................................ 38
4.6.5 Developing Display Drivers ...................................................................................... 38
4.6.6 Brightness Control (Backlight) .................................................................................. 39
4.6.7 Contrast Control (Vee and Vcon) .............................................................................. 39
4.6.8 Touch Panel ............................................................................................................... 39
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Contents
4.7 Discrete IOs ......................................................................................................................... 40
4.7.1 Digital IOs ................................................................................................................. 40
4.7.2 Analog Inputs ............................................................................................................ 40
4.7.3 Analog Outputs (PWM) ............................................................................................. 40
4.8 EMI/RFI and ESD Protection .............................................................................................. 41
4.8.1 Agency Certifications ................................................................................................ 41
4.8.2 Protecting the Power Supply Inputs .......................................................................... 41
5 Power and Power Management ....................................................................................................... 42
5.1 Power Management Modes ................................................................................................. 42
5.1.1 Power Management Modes ....................................................................................... 42
5.1.2 Power Management on the BitsyXb .......................................................................... 42
5.2 Architectural Overview and Power Management Features ................................................. 43
5.2.1 Power Supply Architecture ........................................................................................ 43
5.2.2 Subsystem Partitioning .............................................................................................. 44
5.2.3 System Sleep ............................................................................................................. 46
Power Failure Interrupt
RQOnOff Input
Software Control
5.2.4 System Wakeup ......................................................................................................... 46
RQOnOff Input
Touch Panel
Timed Wakeup
ADSmartIO/Keypad
5.2.5 Supercapacitors .......................................................................................................... 47
Charging
Discharging
5.2.6 Backlight Power ........................................................................................................ 48
5.2.7 Battery Trickle Charger (volume production option) ................................................ 49
5.2.8 Power Supply Efficiency ........................................................................................... 50
5.3 Designing for Optimal Power Management ........................................................................ 50
5.3.1 Create a Power Budget for Peripherals ...................................................................... 50
3.3 V Loads
5 V Loads
Loads on Main Supply
5.3.2 Power Loads During Sleep ........................................................................................ 51
5.4 Power Supply Examples ...................................................................................................... 51
5.4.1 Basic DC Supply ....................................................................................................... 51
5.4.2 Automotive System ................................................................................................... 52
5.4.3 Line Power and Battery with External Charger ......................................................... 52
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6 System Specifications ..................................................................................................................... 54
6.1 Mechanical Specifications ................................................................................................... 54
6.1.1 Mechanical Drawing .................................................................................................. 54
6.1.2 Mounting Holes ......................................................................................................... 54
6.1.3 Clearances.................................................................................................................. 55
6.1.4 Production Options .................................................................................................... 55
Mating Headers on Underside of Board
PCMCIA Rails with no Ejector
Removal of PCMCIA Header
Connector Plating
Microphone Gain
6.2 Environmental Specifications .............................................................................................. 56
6.3 Electrical Specifications ...................................................................................................... 56
6.3.1 Reset, Sleep, Wakeup ................................................................................................ 56
6.3.2 LCD Display .............................................................................................................. 57
6.3.3 Touch Panel Controller .............................................................................................. 57
6.3.4 Power Supply ............................................................................................................. 58
6.3.5 Power Consumption .................................................................................................. 59
6.3.6 ADSmartIO Controller .............................................................................................. 60
6.3.7 System Controller ...................................................................................................... 61
CompactFlash Port Used as Expansion Bus
6.3.8 Audio ......................................................................................................................... 62
6.3.9 PXA270 Processor ..................................................................................................... 63
6.3.10 Crystal Frequencies ................................................................................................... 64
7 Board Revision History ................................................................................................................... 65
7.1 Identifying the board revision .............................................................................................. 65
7.2 Revision History .................................................................................................................. 65
7.2.1 Revision 4 .................................................................................................................. 65
New Features
Changes
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Introduction
1 Introduction
1.1 Overview
The BitsyXb is a full-featured single board computer using the PXA270 Marvell® RISC
microprocessor. The BitsyXb is designed to meet the needs of embedded and graphical systems
developers.
This manual applies to the latest revision of the BitsyXb, as listed in the revision history,
section 7.2.
1.2 Features
1.2.1 Processor
• PXA270 32-bit Marvell® processor
• Clock rates from 104 to 520 MHz
• Battery-backed real-time clock
1.2.2 Power Supply
• 6-15 V main power input
• Battery trickle charger
• External supercapacitors support
1.2.3 Memory
• 64 MB synchronous DRAM 1
• 32 MB Flash memory
• PCMCIA, Type I and II, 3.3 and 5 V
• CompactFlash
2
(CF) cards with optional personality board
1
The BitsyXb supports 16, 32, 64 or 128 MB SDRAM.
2
CompactFlash is a trademark of the CompactFlash Association, http://www.compactflash.org/.
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