Applied Data Systems Bitsy Plus User manual

Bitsy Plus
User’s Manual
ADS document # 110114-1001A
Applied Data Systems
www.applieddata.net
9140 Guilford Road
Columbia MD 21046 USA
301-490-4007
© 2003 ADS

Bitsy Plus User’s Manual
ADS document # 110114-1001A Page i
About the Cover Image
The cover image shows a Rev A Bitsy Plus populated with the supercapacitor option.
Printing this Manual
This manual has been designed for printing on both sides of a 8.5x11 inch paper, but can be
printed single-sided as well. It has also been optimized for use in electronic form with active
cross-reference links for quick access to information.
Revision History
This table summarizes the changes made between revisions of this manual.
REV DESCRIPTION DATE/BY
6Initial release 11/04/02
ak
A
Product Specification Changes and Updates
Add Vcc and Vddx sleep current specs (6.2.4)
Add power consumption measurements and plots (6.2.5)Change
ADSmartIO PA5 from VBATT_NEG to DC_GOOD (4.3.7,
6.2.1)
Change DCIN_POS parameter to VBATT_POS, reduce minimum
voltage from 6 to 5 V and add note 15.
Add Vsleep,hyst parameter and note (6.2.1)
Lower Vsleep voltage specification (6.2.1)
Update value for Rtl (6.2.6, 7.2.5)
Update value for Rp pcmcia (6.2.12)
Add max current drain on Vref (6.2.6)
Add specs for PCMCIA VS and CD pull-up voltage and resistance
(6.2.12)
Add contrast circuit power specifications to section 6.2.2.
Add note about analog input resolution (6.2.6)
Indicate that PD0 and PD1 are for dedicated functions and not
available for general purpose use (3.3.8, 4.3.7)
Increase 5 V PCMCIA/CF socket power to 2.5W (6.2.12)
5/2/2003
ak

Bitsy Plus User’s Manual
Page ii ADS document # 110114-1001A
A
New Information
Update PD3 from /RqOnOff to CPLD wakeup in section 4.3.7
Update SA-1110 signal cross-reference (4.1.6) with GP11 and GP12
changes
Add notes about the USB_Reconn signal in sections 3.3.3 and 4.5.2.
Add ADSmartIO voltage reference power control to section 5.3.2
and 6.2.6.
Expand information about A/Ds and digital I/Os in section 1.2.6
Expand information about connections for external interrupt sources,
section 4.1.4
Add section 5.4.2, Power Loads During Sleep
Add cross-references to section 3.3.1 (J1).
Expand introduction to section 5.2
Add note about /BacklightOn changes in Revision History (7.2.1)
Add FAQ about LEDs in section 2.2
Add introduction to section 4.5
Add details about processor voltages (6.2.10)
Expand information about PCMCIA/CF current leaks during sleep
(6.2.12)
Add "Printing this Manual" section
Add pin direction information to pinouts (3.3)
Add note about change in 3.3V PCMCIA power control (7.2.4)
Add information about driver of LED; expand note about GP20,
which is shared by LED0/DTR1 (3.1.2)
Add rev. 5 Vref and /RqOnOff changes to power management
diagram (5.3.2)
Add diagram of audio architecture (6.2.9)
Update mechanical drawing and clearances (6.1.1) and note lower
height profile (7.2.4)
Add 5-wire touch panel signal names to J3 signal table (3.3.3)
Add detail about availability of 128 MiB RAM (1.2.3, 4.1.2)
Remove unimplemented "Reset CPU" feature from ADSmartIO
table (4.3.2)
Update USB wording and add details about the USB_Reconn signal
(4.5.2)
Add USB devices to 5V and Sleep loads (5.4.1, 5.4.2)
Credit Linear Tech for "Burst Mode" (5.3.8)
Change diode in battery charger to fuse (5.5.3)
Clarified USB_PWR_SENSE and USB_PWR_CTRL voltage specs
(6.2.8)
Add section 5.3.3, System Sleep

Bitsy Plus User’s Manual
ADS document # 110114-1001A Page iii
A
Clarifications
Clarify availability of A/Ds in section 4.3.4
Update backlight power section (5.3.6) to clarify that backlight
power is not handled by the Bitsy Plus
Add to Rev 2 Revision History that EIOn I/Os can source/sink more
current
Update signal tables to include analog and open-collector signal
types; indicate direction of power signals
Clarify how SPI chip select controlled (4.5.3)
Clarify that OS can put the system to sleep when power fails (5.2.2)
Clarify that voltage ref for ADSmartIO A/Ds is not software
controlled; it is turned off when system is asleep (5.3.2, 7.2.5)
Add 64 MiB flash and footnote about availability (1.2.3)
Add note about Vsleep and wakeup (5.3.4)
Add Note 4about Vsleep (6.2.1)
Add sleep current notes 16 and 17 (6.2.4)
A
Corrections
Correct reversal of MOSI and MISO signals in section 3.3.3 and add
signal name details in section 4.5.3.
Correct usage of GP 27 in table of section 4.1.6 (not available on J3)
Correct error: JP3 does not control panel data voltage. Sections
updated: 3.2.1(remove note), 4.6.2 and 4.6.3 (correct text), 6.2.2
(add information about R288 and R289)
Correct Serial 1 connector (J1 to J10) (4.1.6)
Remove extra close parenthesis in Icharge equation of section 5.3.7
Correct ADSmartIO cross-reference (4.3.1)
Correct "Vdd" to "V" in controller specs and remove reference to
PowerEnable (6.2.7)
Correct information about JP3 and LED; add diagram of LED circuit
(3.1.2)
Correct IrDAOn notes: no pull-up (3.3.3)
Update and correct power supply diagram (esp. 3.3V powered from
DC_IN); add notes about factory options (5.3.1)
Correct Note 13 (6.2.2) to indicate that Vee and Vcon available
concurrently
Correct typo: LLD to LDD

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Bitsy Plus User’s Manual
ADS document # 110114-1001A Page v
Table of Contents
About the Cover Image..........................................................................................................................................i
Printing this Manual...............................................................................................................................................i
Revision History.....................................................................................................................................................i
Table of Contents..................................................................................................................................................v
1Introduction.......................................................................................................................................1
1.1 Overview ...............................................................................................................................1
1.2 Features..................................................................................................................................1
1.2.1 Processor......................................................................................................................1
1.2.2 Power Supply...............................................................................................................1
1.2.3 Memory .......................................................................................................................1
1.2.4 Communications..........................................................................................................1
1.2.5 User Interface and Display ..........................................................................................2
1.2.6 I/O 2
1.2.7 Audio Interface............................................................................................................2
1.3 Block Diagram.......................................................................................................................3
2Getting Started ..................................................................................................................................5
2.1 Development Systems ...........................................................................................................5
2.1.1 System Components ....................................................................................................5
2.1.2 Bitsy Plus Personality Boards......................................................................................5
ADS CF Personality Board ..................................................................................5
ADS Ethernet Personality Board..........................................................................6
2.2 Frequently Asked Questions..................................................................................................6
2.3 Organization of this Manual ..................................................................................................7
2.4 Errata, Addenda and Further Information..............................................................................7
3Hardware Reference..........................................................................................................................9
3.1 Switches and Indicators.........................................................................................................9
3.1.1 S1: DIP Switch ...........................................................................................................9
3.1.2 LED Indicator..............................................................................................................9
3.2 Jumper Settings......................................................................................................................9
3.2.1 JP3: Flat Panel Power Select ....................................................................................10
3.2.2 JP4: Vee Polarity Select............................................................................................10
3.3 Connector Pinouts................................................................................................................10
3.3.1 J1: LCD Panel Interface Connector..........................................................................11
3.3.2 J2: PCMCIA .............................................................................................................12
3.3.3 J3: Power, I/O, Serial 2 & 3, USB, Touch Screen and others...................................12

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Page vi ADS document # 110114-1001A
3.3.4 J4: Manufacturing Test Connector............................................................................13
3.3.5J5: JTAG Connector .................................................................................................13
3.3.6 J6: Input Power Connector .......................................................................................13
3.3.7 J9: External CompactFlash / Expansion Bus............................................................14
3.3.8 J10: ADSmartIO, USB, Serial 1, Stereo Audio, I/Os ...............................................15
4Feature Reference............................................................................................................................17
4.1 System Architecture.............................................................................................................17
4.1.1 Boot Code..................................................................................................................17
4.1.2 Synchronous DRAM .................................................................................................17
4.1.3 Non-Volatile Memory ...............................................................................................17
Flash Memory.....................................................................................................17
ADSmartIO EEPROM........................................................................................17
CompactFlash and PCMCIA/ATA Cards...........................................................17
RTC NVRAM ......................................................................................................18
4.1.4 Interrupts....................................................................................................................18
4.1.5 CompactFlash / Expansion Bus.................................................................................18
4.1.6 SA-1110 GPIO Cross-Reference...............................................................................18
4.2 Real-Time Clock (RTC) ......................................................................................................19
4.3 ADSmartIO..........................................................................................................................19
4.3.1 Overview ...................................................................................................................19
4.3.2 ADSmartIO Features.................................................................................................20
4.3.3 Digital I/Os................................................................................................................20
4.3.4 Analog Inputs (A/D)..................................................................................................20
4.3.5 Temperature Sensing .................................................................................................20
4.3.6 Keypad Scan..............................................................................................................20
4.3.7 ADSmartIO Signal Cross-Reference.........................................................................22
4.4 Audio...................................................................................................................................23
4.4.1 Microphone Pre-amps................................................................................................23
4.4.2 Audio Outputs: Speakers and Headphones................................................................23
Connecting Speakers ..........................................................................................23
Connecting Headphones.....................................................................................23
Using Stereo Headphones and Speakers in the Same System.............................25
4.5 Data Communications .........................................................................................................25
4.5.1 Serial Ports.................................................................................................................25
4.5.2 USB ...........................................................................................................................25
USB Host............................................................................................................26
USB Client..........................................................................................................26
4.5.3 SPI Bus......................................................................................................................26
Overview.............................................................................................................26
SPI on the Bitsy Plus ..........................................................................................27
Alternate uses of the SPI Port.............................................................................27
4.5.4 I2C Bus Master and SMBus.......................................................................................27
Overview.............................................................................................................27
I2C on the Bitsy Plus...........................................................................................27
SMBus.................................................................................................................28
4.6 Displays...............................................................................................................................28
4.6.1 Display Types Supported...........................................................................................28

Bitsy Plus User’s Manual
ADS document # 110114-1001A Page vii
4.6.2 Panel Voltages ...........................................................................................................28
4.6.3 Display Signals..........................................................................................................29
4.6.4 Creating Display Cables ............................................................................................29
4.6.5 Developing Display Drivers ......................................................................................29
4.6.6 Brightness Control (Backlight)..................................................................................30
4.6.7 Contrast Control (Vee and Vcon)..............................................................................30
4.6.8 Touch Panel...............................................................................................................30
4.7 EMI/RFI and ESD Protection..............................................................................................30
4.7.1 Agency Certifications................................................................................................30
4.7.2 Protecting the Power Supply Inputs...........................................................................30
5Power and Power Management.......................................................................................................31
5.1 Determining the Features You Need....................................................................................31
5.2 Power Management Modes .................................................................................................32
5.2.1 StrongARM Power Management Modes...................................................................32
5.2.2 Power Management on the Bitsy Plus.......................................................................32
5.3 Architectural Overview and Power Management Features..................................................33
5.3.1 Power Supply Architecture........................................................................................33
5.3.2 Subsystem Partitioning..............................................................................................33
5.3.3 System Sleep..............................................................................................................35
Power Failure Interrupt .....................................................................................35
RQOnOff Input ...................................................................................................36
Software Control ................................................................................................36
5.3.4 System Wakeup .........................................................................................................36
RQOnOff Input ...................................................................................................36
Touch Panel........................................................................................................36
Timed Wakeup....................................................................................................36
ADSmartIO.........................................................................................................36
5.3.5 Supercapacitors (factory option)................................................................................37
Charging.............................................................................................................37
Discharging........................................................................................................37
5.3.6 Backlight Power.........................................................................................................38
5.3.7 Battery Trickle Charger (factory option) ...................................................................38
5.3.8 Power Supply Efficiency...........................................................................................39
5.4 Designing for Optimal Power Management ........................................................................39
5.4.1 Create a Power Budget for Peripherals......................................................................39
3.3 V Loads.........................................................................................................39
5V Loads............................................................................................................40
Loads on Main Supply........................................................................................40
5.4.2 Power Loads During Sleep........................................................................................40
5.5 Power Supply Examples......................................................................................................41
5.5.1 Basic DC Supply........................................................................................................41
5.5.2 Automotive System ...................................................................................................41
5.5.3 Line Power and Battery with External Charger.........................................................42

Bitsy Plus User’s Manual
Page viiiADS document # 110114-1001A
6System Specifications .....................................................................................................................43
6.1 Mechanical Specifications...................................................................................................43
6.1.1 Mechanical Drawing..................................................................................................43
6.1.2 Mounting Holes.........................................................................................................43
6.1.3 Clearances..................................................................................................................44
6.2 Electrical Specifications ......................................................................................................45
6.2.1 Temperature, Reset, Sleep, Wakeup..........................................................................45
6.2.2 Display.......................................................................................................................46
6.2.3 Touch Panel Controller..............................................................................................46
6.2.4 Power Supply.............................................................................................................47
6.2.5 Power Consumption...................................................................................................48
6.2.6 ADSmartIO Controller ..............................................................................................49
6.2.7 System Controller with Digital I/Os..........................................................................50
6.2.8 USB ...........................................................................................................................50
6.2.9 Audio.........................................................................................................................50
6.2.10 SA-1110 Processor ....................................................................................................52
6.2.11 Crystal Frequencies ...................................................................................................52
6.2.12 SA-1111 Companion Chip.........................................................................................53
PCMCIA, CompactFlash Port and Expansion Bus............................................53
7Board Revision History...................................................................................................................55
7.1 Identifying the board revision..............................................................................................55
7.2 Revision History..................................................................................................................55
7.2.1 Revision 2..................................................................................................................55
New Features......................................................................................................55
Enhancements.....................................................................................................55
Changes..............................................................................................................55
7.2.2 Revision 3..................................................................................................................57
7.2.3 Revision 4..................................................................................................................57
7.2.4 Revision 5:.................................................................................................................57
New Features......................................................................................................57
Enhancements.....................................................................................................57
Changes..............................................................................................................57
7.2.5 Revision A:................................................................................................................57
Enhancements.....................................................................................................57
Changes..............................................................................................................58

ADS document # 110114-1001A Page 1
1Introduction
1.1 Overview
The Bitsy Plus is a full-featured single board computer using the SA-1110 StrongARM RISC
microprocessor and SA-1111 Companion Chip. The Bitsy Plus is designed to meet the needs of
embedded and graphical systems developers.
This manual applies to Revision A of the Bitsy Plus. The revision history of the Bitsy Plus is
listed in chapter 7.
1.2 Features
1.2.1 Processor
•SA-1110 32-bit StrongARM
•SA-1111 Companion Chip
•Clock rates up to 206 MHz
•Battery-Backed Real-Time Clock
1.2.2 Power Supply
•6-15 V Input Range
•Battery Trickle Charger
1.2.3 Memory
•16, 32, 64 or 128 1MiB2synchronous DRAM
•8, 16, 32 or 64 3MiB Flash
•PCMCIA and CompactFlash4(CF), Type I and II, 3.3 and 5 V
•Supports CF cards with optional personality board
1.2.4 Communications
•USB 1.1 Host port (low 1.5 Mbit/s and full 12 Mbit/s speeds) and full speed Client port
•Three Serial Ports
Serial 1: RS-232, 3.3V CMOS (9-wire)
Serial 2: 3.3V CMOS (3-wire); IrDA and RS-232 with optional personality board
Serial 3: RS-232, 3.3V CMOS (5-wire)
1The Bitsy Plus supports 128 MiB SDRAM. However, those components are not yet
commercially available as of April 2003.
2MiB is the IEC abbreviation for mebibyte = 220 byte = 1 048 576 byte. The kibi and mebi
abbreviations are based on the 1998 IEC standard for binary multiples. For further reading, see
the US NIST web site, http://physics.nist.gov/cuu/Units/binary.html
3The Bitsy Plus supports synchronous and asynchronous flash. The 64 MiB flash option is
available only in synchronous flash.
4CompactFlash is a trademark of the CompactFlash Association, http://www.compactflash.org/.

Bitsy Plus User’s Manual
Page 2ADS document # 110114-1001A
•10/100BT Ethernet, RJ45 (with optional personality board)
•CompactFlash Interface (with optional personality board)
1.2.5 User Interface and Display
•Flat Panel Interface
•Software-Controlled VEE Generator for passive LCD contrast control
•Analog Touch Panel Interface (four-or five-wire options)
•External PS/2 Keyboard Support
1.2.6 I/O•Nine ADSmartIOTM ports configurable for digital I/O, A/D inputs (up to four) and/or up
to 4x5 keypad
•Ten digital I/Os
•Backlight Control Signals for Intensity and On/Off
•External Temperature Probe support
1.2.7 Audio Interface
•AC'97 Codec
•Stereo Microphone Input
•Stereo 1W Speaker Outputs
•Headphone Output

Introduction
ADS document # 110114-1001A Page 3
1.3 Block Diagram
The following diagram illustrates the system organization of the Bitsy Plus.
SA1110
SA1111
SDRAM
FLASH
AC’97
CODEC
COM2 / IrDA
COM3
COM1
USB Function
Touch Screen
SPI
Stereo Mic
Stereo Speaker
Headphones
PCMCIA
Compact Flash
USB Host
Power
Management
Controller
AVR
ADSmartIO
I
2
C
RTC
External
3V Battery Cell
PS/2 Keyboard
DC IN
Battery IN
Temp. Sensor
4 AN+5 DIG Ins, or
4x5 Scan Matrix, or
9 GPIOs
Progr. IO
Controller
10 IOs
Backlight Ctrl
LCD Interface
Contrast
Regulator
Power Supply
Regulator
Bitsy Plus
SuperCap
Address,
Data,
Control
Controller
Power Amp
Pre- Amp

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ADS document # 110114-1001A Page 5
2Getting Started
2.1 Development Systems
Bitsy Plus boards are shipped as development systems designed to get the developer up and
running quickly.
To use the system, simply plug power supply into the mini DIN-8 receptacle on the system.
If the screen does not display anything after five to ten seconds, check the Frequently Asked
Questions, below. Most operating systems cold boot within twenty seconds.
2.1.1 System Components
A typical development system consists of the following:
•Bitsy Plus single-board computer
•Bitsy Personality Board with CompactFlash or 10/100BT Ethernet
•Flat panel display and cable
•Backlight inverter and cable
•Touch screen and cable
•120 VAC power adapter
•Plexiglas mounting
•Developer's Cable Kit including
•Serial Port DB9 adapter (ADS cable #610111-80001)
•DB9F/F null modem cable
•Operating system of your choice
•User's Guide (this document and operating system guide)
Please make sure you have received all the components before you begin your development.
2.1.2 Bitsy Plus Personality Boards
The Bitsy Plus often works in tandem with another board to add functionality and customize the
system for its application. Personality boards can add custom circuits and locate connectors best
suited for the application design.
In production volumes, the Bitsy Plus can be built with interface connectors J1, J3, J9 and J10 on
the underside of the board. This allows the Bitsy rest above custom personality boards rather than
below them.
At the time of writing, ADS supplies a reference design for personality board. Schematics are and
user manuals available on the ADS support site. The ADS design can be populated as either a
"CF" or "Ethernet" personality board.
ADS CF Personality Board
The CF Personality board breaks out signals to the Bitsy for a wide range of functions including
USB, audio, keyboard, power, serial, LCD display, backlight, IrDA and touch screen. It also
includes a reset button and CF socket.
For further details about this board, please consult the Personality Board user's manual, ADS
document #110111-8001.

Bitsy Plus User’s Manual
Page 6ADS document # 110114-1001A
ADS Ethernet Personality Board
The Ethernet Personality Board uses the same circuit board as the ADS CF Personality Board. An
RJ-45 jack replaces the CF socket, and the board adds an SMSC LAN91C111 10/100 Ethernet
chip and associated line drivers. Otherwise, the board is identical to the CF Personality Board.
2.2 Frequently Asked Questions
The following are some of the most commonly asked questions for development systems:
Q: When I plug in power, my screen is white and nothing comes up on it.
A: Check the connector seating. The flat panel connector may have come loose in shipping.
Press it firmly into the panel and reapply power to your system.
Q: When I plug in power, my screen stays black.
A: If your system has supercapacitors installed (section 5.3.3), your system may be asleep. Try
waking up the system by shorting the wakeup signal (J3 pin 45) to ground. Development systems
include a two-pin header on the personality board whose pins can be shorted together to wake the
system. You may also press the reset button to fully restart the system.
Q: When I plug in power, the LED doesn't turn on.
A: Your system may still be booting. The LED is software controlled and is not necessarily
turned on at boot.
Q: Do I have to turn off the system before I insert a PCMCIA or CompactFlash card?
A: No. The Bitsy Plus supports hot-swapping of PCMCIA and CompactFlash cards. Consult the
operating system documentation for details.
Q: Do I need to observe any ESD precautions when working with the system?
A: Yes. If possible, work on a grounded anti-static mat. At a minimum, touch an electrically
grounded object before handling the board or touching any components on the board.
Q: What do I need to start developing my application for the system?
A: You will need a flash ATA card (16 MiB or larger, 32 MiB recommended) and the cables
supplied with your system to interface your development station to the system. For further
direction, consult the ADS guide for the installed operating system.
Q: Who can I call if I need help developing my application?
A: ADS provides technical support to get your development system running. For customers who
establish a business relationship with ADS, we provide support to develop applications and
drivers.
Q: Is there online support?
A: Yes. Information about the Bitsy Plus hardware and software is available on the ADS support
site at http://www.applieddata.net/support. See section 2.4 for further details.
Q: Can I upgrade the version of the operating system?
A: Yes. ADS provides regular operating system updates on its developers' web site. For
operating systems not maintained by ADS, contact the operating system vendor.
Q: I would like to interface to a different display panel. How can I do this?
A: ADS may have already interfaced to the panel you are interested in. Consult ADS for
availability.

Getting Started
ADS document # 110114-1001A Page 7
2.3 Organization of this Manual
The manual organizes information in five key sections:
Introduction Provides an overview of the functionality and organization of the Bitsy
Plus, as well as how to use this manual.
Hardware Reference Describes the configuration settings and pinouts for all connectors and
jumpers on the Bitsy Plus.
Feature Reference Gives details about the various subsystems of the Bitsy Plus.
Power Management Provides key information about power management, tips for system
integration and electrical and mechanical interface specifications.
Specifications Electrical and mechanical interface specifications.
To locate the information you need, try the following:
1. Browse the Table of Contents.Section titles include connector designators and their
function.
2. Follow cross-references between sections.
3. View and search this manual in PDF format
2.4 Errata, Addenda and Further Information
Errata and addenda to this manual are posted on the ADS support forums along with the latest
release of the manual. Consult the support forums any time you need further information or feel
information in this manual is in error. You may access the forums from the ADS support site,
http://www.applieddata.net/Support
In addition to manuals, the support forums include downloads, troubleshooting guides, operating
system updates and answers to hundreds of questions about developing applications for ADS
products. You may also post questions you have about ADS products on the forums.

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ADS document # 110114-1001A Page 9
3Hardware Reference
This section gives an overview of the hardware features of the Bitsy Plus. This overview includes
a description of the switches, jumper settings, connectors and connector pinouts.
Many connectors and headers have a visible number or marking on the board that indicates pin 1.
If that pin is not clearly marked, there are two other ways to locate pin 1:
1. The easiest method is to look at the underside of the board. The square pad is pin 1.
2. Download the mechanical drawing of the Bitsy Plus available on the ADS Support site
(section 2.4). The square or indicated pad on each connector is pin 1.
3.1 Switches and Indicators
3.1.1 S1: DIP Switch
S1 is a two-position DIP switch. When in the "ON" position, switches are closed and connect to
ground. Otherwise they are pulled up.
DIP switch positions "1" and "2" connect to the SA-1111.
Most operating systems on the Bitsy Plus reserve these switches for their use. Consult the
operating system manual for details.
3.1.2 LED Indicator
The Bitsy Plus has one onboard LED mapped as follows:
Signal GPIO line Part Designator Color
LED0 20 D3 Green
LED0 shares StrongARM GPIO20 with the DTR
signal of Serial 1 (J10), as shown at right. The
LED is not available for application use when the
DTR line is in use by the Serial 1 driver.
The LED is driven by the same buffers as the
display driver data lines. The LED will be off
when the display buffers are disabled (see power
management section 5.3.2).
3.2 Jumper Settings
Jumpers on the Bitsy Plus select a variety of operational modes. All
use 2mm shorting blocks (shunts) to select settings. Make sure
power is turned off to the Bitsy Plus when changing the position of
a shunt.
JP3 and JP4 are located at the corner of the board near the PCMCIA
ejector as shown at right:
V_PNL_DATA
+ RS-232
- RS-232
D3
DTR1
GP20

Bitsy Plus User’s Manual
Page 10 ADS document # 110114-1001A
3.2.1 JP3: Flat Panel Power Select
Type: 3-post header, 2mm
This jumper selects the supply voltage for the flat panel. It is located near the PCMCIA ejector
button.
Jumper setting Voltage Selected
1-2Vddx (3.3 V)
2-3Vcc (5.0 V)
WARNING! Make sure you have selected the correct voltage before connecting the panel. Flat
panels are notoriously sensitive to--and are often irreparably damaged by--incorrect voltages.
3.2.2 JP4: Vee Polarity Select
Type: 3-post header, 2mm
This jumper selects the polarity of Vee, the contrast control voltage for passive displays. Vee is
controlled with a PWM signal from the ADSmartIO (section 4.3). See section 4.6.7 for further
details bout Vee.
Jumper setting Vee
1-2positive
2-3negative
n/c no Vee
3.3 Connector Pinouts
The following tables describe connector pinouts and the type of connector. At least one pin of
every connector is labeled on the Bitsy Plus. Pin 1 of the connector is also
typically indicated by a square pad where the pin is soldered to the board.
As seen from the component side5, double-row headers on the board are all
numbered as shown in the figure to the right.
For information about the location of the connectors on the Bitsy Plus, refer to section 6.1.1.
Legend: n/c Not connected
GND Bitsy Plus ground plane
(3.3)Reference sections for signals
Isignal is an input to the system
Osignal is an output from the system
IO signal may be input or output
Ppower and ground
Aanalog signals
OC open collector output
5The "component side" of the Bitsy Plus is the one on which the PCMCIA ejector is installed. As
a factory option, some connectors may be installed on the "bottom side" of the Bitsy Plus.
2 4 6 8...
1 3 5 7...