Spectrum Digital AppBox E54 User manual

AppBox E54 System User’s Guide 1 AppBox
AppBox E54
System User’s
Guide
Specializes in
designing with
Microchip
products

AppBox E54 System User’s Guide 2 AppBox
Notice !
Spectrum Digital, Inc (SDI) provides the enclosed product under the following conditions:
The user/customer assumes all responsibility and liability for the proper use, storage, and safe handling
of the product. Further, the user indemnifies SDI from all claims arising from the use, installation, storage,
and handling of the product. Due to the flexibility and open construction of the product, it is the user’s
responsibility to take all appropriate precautions with regard to powering, attachment of cables,
connection to other equipment, and electrostatic discharge.
Except to the extent of the indemnity set forth above, neither party shall be liable to the other for any
indirect, special, incidental, or consequential damages.
SDI assumes no liability for applications assistance, customer product design, system and software
performance, or infringements of patents or services described herein.
No license is granted under any patent right or other intellectual property right of SDI covering or relating
to any machines, process, software, or combination in which such SDI products or services might be or
are used.
SDI currently with a variety of customer for products, and therefore our arrangement with the resellers,
customer, or user is not exclusive.
Please refer to the product web page on the SDI web site for warranty period.
The warranty and return policy are described on the SDI web site.
Mailing address:
Spectrum Digital, Inc
PO Box 1559
Sugar Land, TX. 77487-1559
Web site: www.spectrumdigital.com
Sales: [email protected]
Support: [e-mail]
Copyright Spectrum Digital Inc, © 2020
519198-4001

AppBox E54 System User’s Guide 3 AppBox
Table of Contents
Section Title Page
1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 AppBox E54 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 What’s Included In The AppBox E54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 AppBox E54 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 AppBox E54 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5 AppBox E54 Communication Expansion . . . . . . . . . . . . . . . . . . . . . . . 6
1.6 AppBox E54 Software Development Tools . . . . . . . . . . . . . . . . . . . . . . . 6
2.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Attaching Power to the AppBox E54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Installation of AppIO Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Attachment of the Distribution Box to the AppBox E54 . . . . . . . . . . . . . . . . . 9
2.4 Installation of Atmel-ICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.0 Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.1 J1, Power Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.2 J2, RS485, CAN Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.1.3 J3, USB Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1.4 J4, Ethernet Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1.5 J5, SD Card Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.1.6 J6, Cortex-M Debug Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.1.7 AppIO Module Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.1.7.1 EXT1, AppIO Module 1 Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1.7.2 EXT2, AppIO Module 2 Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.1.7.3 EXT3, AppIO Module 3 Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.2 Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.3 Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.4 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.5 Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.0 Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.0 Mechanical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.0 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

AppBox E54 System User’s Guide 4 AppBox
1.0 Introduction
This document describes the features of the AppBox E54. The AppBox E54 is designed to be used in an
industrial environment with a CAN, RS485, USB, or Ethernet interface to provide flexible, modular I/O
(AppIO) for specific applications. These AppIO Modules allow customized solutions to be integrated for a
wide variety of applications that need to go into a CAN, RS485, USB, or Ethernet communications
environment.
1.1 AppBox E54 Features
This AppBox E54 has the following features:
Atmel ATSAME54P20A-AU processor (ARM Cortex-M4) running at 48 MHz., no wait states
Operates on +12 to +24 volts DC, with Backup Supercapacitor
CAN interface for industrial systems
RS485 communications for industrial systems
Communication interface expansion via Distribution Box (sold separately)
Provides USB communications for computer based industrial applications
Provides Ethernet communications for industrial IoT applications
256KB RAM, 1 MB Flash
SD card memory connector for storage and logging
Modular I/O expansion via up to three (3) AppIO Modules, Atmel X PLAINED compatible
Fully enclosed system with knock out panels for AppIO Modules (sold separately)
Convenient enclosure mounting holes
Vented enclosure for cooling
Front panel push button switch
Front panel programmable LED
Atmel-ICE debug header present for development
Operates 0 - +70C
E
54
C
P
U
B
OARD
AppIO
Module #1
AppIO
Module #3
AppIO
Module #2
RS485/
CAN
Power
+12-24 VDC
Interface #3
Interface #1
Interface #2
User Defined
AppBox E54 Block Diagram
LED
Comms
Select
Switch
ATSAME54
uP
USB
Ethernet SD Card
Connector
Atmel-ICE
Header
J1
J2
SW1
J3
J4
LED1 EXT1
EXT2
EXT3
Push
Button
Switch

AppBox E54 System User’s Guide 5 AppBox
1.2 What’s Included In the AppBox E54
The Spectrum Digital AppBox E54 product (Part/SKU #: 703919-0001) includes:
AppBox E54 in anti-static bag
Terminal block header for power input
Product information card
NOTE: This product does not include any software or drivers. Development tools (Atmel-ICE and
Software code generation suite) can be obtained from Microchip/Atmel at:
https://www.microchip.com/development-tools/.
1.3 AppBox E54 Front Panel
The features of the front panel on the AppBox E54 are shown in the figure below:
1.4 AppBox E54 Accessories
The following accessories for the AppBox E54 can be ordered from Spectrum Digital or authorized resellers:
Accessory Description Part/SKU Number
AppBox Power Supply with cable,
110/220 VAC to 12 VDC, 1.5A 703925-0001
Distribution Box 703924-0001
AppBox cable 703925-0001
CAN cable 703912-0001
RS485 cable 703917-0001
USB - RS485 cable 703914-0001
SW1 J1J2
LED1 AppBox E54 Front Panel
Ethernet USB

AppBox E54 System User’s Guide 6 AppBox
1.5 AppBox E54 Communication Expansion
The J2 connector on the AppBox E54 presents multiple communication interfaces. The standard factory
cables only support one interface at a time. To have access to multiple communication interfaces a
Distribution Box (Part/SKU #: 703924-0001) and AppBox cable (Part/SKU #:703923-0001) are required.
The Distribution Box expands the J2 connector to four (4) images of the AppBox E54 J2 connector. The
AppBox cable bridges all signals on the AppBox E54 J2 connector to a connector on the Distribution Box.
Be aware that one of the Distribution Box connectors will be used for the AppBox bridging cable leaving
3 connectors to be used for communication interfaces. All cables that can plug into the J2 connector on the
AppBox E54 can plug into the Distribution Box.
The user should enable all interfaces they want to use with the Distribution Box by setting the switch positions
on Switch SW2, positions 1 and 2. See section 3.3.
The AppBox E54 and Distribution Box system configuration is shown in the figure below:
1.6 AppBox E54 Software Development Tools
The AppBox E54 is compatible with the software and hardware development tools from Microchip/Atmel.
These tools are described on the Microchip/Atmel website:
https://www.microchip.com/development-tools/
These tools include the following:
Editor
Compiler/assembler/linker
Libraries
Operating System
Debugger
JTAG Emulator
RS485/
CAN
RS485/
CAN
RS485/
CAN
AppBox E54 with Distribution Box
Distribution Box
AppBox E54
J2 Connector
AppBox Cable

AppBox E54 System User’s Guide 7 AppBox
2.0 Installation
2.1 Attaching Power to the AppBox E54
Power can be provided to the AppBox E54 by two different means; the AppBox power supply with cable
(Part/SKU #: 703925-0001), or wiring the 2 position terminal block header (included with AppBox E54) that
plugs into the E54 CPU Board’s power input connector. See the figure below.
Listed below are the steps to install the terminal block header power connector into the AppBox E54.
1. Cut 2 pieces of wire (preferably 1 red for positive-VIN, 1 black for negative-DGND) to the desired
length for your application. This wire should be 22 gauge or heavier
2. Strip ¼ inch (6-7 mm) of insulation from one end of each wire.
3. Position the terminal block header on a flat surface with the key stubs up and away from you. See
the figure below.
4. Insert the negative/DGND wire (black) into the left wire hole and tighten the screw.
5. Insert the positive/VIN wire (red or black with strip) into the right wire hole and tighten the screw.
6. The terminal header should look like the figure below.
7. Pull/tug on the wires to insure they are secure in the terminal block.
Terminal Block Header
AppBox Power Connector
Positive
VIN
Negative
DGND
Wired Terminal Block Header
Positive
VIN
Negative
DGND
Screw
Screw

AppBox E54 System User’s Guide 8 AppBox
8. Attach the loose end of the wires to a +12 – 24 VDC power source. Be sure of the polarity. This
power source should supply at least 1 amp of current. This requirement will vary
depending on the current requirements of the E54 CPU board and the AppIO Modules.
9. Turn on the power source.
10. With a multi-meter or oscilloscope measure the voltage at the terminal block header to verify
+12 -24 VDC is present. Place the meter/scope probes on the 2 screws to measure.
11. Turn off the power source
12. Insert the terminal block header into the power input of the AppBox E54.
13. Turn on the power source.
2.2 Installation of AppIO Modules
Listed below are the steps to install AppIO Modules in the AppBox E54:
1. Remove ALL power to the AppBox enclosure
2. Remove all interface connections attached to the installed AppIO Modules
3. Remove the CAN/RS-485/USB/Ethernet connections to the E54 processor board
4. Turn the AppBox over and remove the 2 screws from the bottom of the enclosure as shown
below
5. Turn the AppBox back over (label showing) and lift the top off the enclosure being careful not to
lose the knockout panels
6. If necessary remove one or more existing AppIO Modules and associated knockout panels by
unscrewing the 2 screws
7. Plug the new AppIO Module(s) into EXT1, EXT2, or EXT3 on the E54 CPU Board
Screws
A
pp
Box Bottom Screw Locations
A
pp
IO Module Attached to E54 CPU Board
E54 CPU
Board
AppIO Module
AppIO Knockout
Panel
Screw
Screw

AppBox E54 System User’s Guide 9 AppBox
8. Insert the included knock out panel associated with this AppIO Module
9. Insert and tighten the 2 screws for the AppIO Module
10. Insert the knock out panels in any unused positions
11. Place the cover back over the E54 processor board and AppIO Modules
12. Insert the 2 screws back in and tighten until snug, do not over tighten/strip the screws
13. Re-attach the CAN/RS-485/USB/Ethernet connections to the processor board
14. Re-attach all interface connections to the AppIO Modules
15. Apply power to the AppBox E54
2.3 Attachment of Distribution Box to the AppBox E54
Listed below are the steps to attach the Distribution Box (Part/SKU #: 703924-0001) to the AppBox E54:
1. Remove ALL power to the AppBox E54 enclosure
2. Remove any communication cables from the J2 connector on the AppBox E54
3. Plug one end of the AppBox cable (Part/SKU #: 703923-0001) into the J2 connector on the
AppBox E54
4. Plug the other end of the AppBox cable into one of the connectors on the Distribution Box
5. Plug the desired communication cables into the Distribution Box
6. Make all other connections before powering
7. Apply power to the AppBox E54
A
pp
Box E54 with A
pp
IO Module Installed
AppIO Module
Connector
AppIO Knockout
Panel
A
pp
Box E54 Connected to Distribution Box
AppBox
AppBox Cable
Distribution Box

AppBox E54 System User’s Guide 10 AppBox
2.4 Installation of Atmel-ICE emulator
Listed below are the steps to install Atmel-ICE emulator:
1. Remove ALL power to the AppBox E54 enclosure
2. Remove all interface connections attached to the AppIO Modules
3. Remove the CAN/RS-485/USB/Ethernet connections to the processor Module
4. Turn the AppBox over and remove the 2 screws from the bottom of the enclosure as shown
below
5. Turn the AppBox back over (label showing) and lift the top off the enclosure being careful not to
lose the knockout panels
6. Plug the emulator end of the ribbon cable into the “SAM” Port on the emulator
7. Plug in the Atmel-ICE debug into connector J6 on the AppBox E54 CPU board. Visually inspect
the connection to insure all the board pins are in the female cable connector.
8. Re-attach the CAN/RS-485/USB/Ethernet connections to the processor board
9. Re-attach all interface connections to the AppIO Modules
10. Apply power to the AppBox E54
11. Start debug session on the host computer
Screws
A
pp
Box Bottom Screw Locations
E54 CPU Board
Atmel-ICE Attached to A
pp
Box E54 CPU Board
Atmel-ICE
J6 Connector
RED Wire
SAM Port

AppBox E54 System User’s Guide 11 AppBox
3.0 Interfaces
This section describes the interfaces on the AppBox E54 CPU Board. These interfaces include the
connectors, jumpers, switches, LEDs, and test points.
The location of each of these interfaces is shown in the figure below:
SW1
SW2
J1
EXT1
EXT3
EXT2
J4
TP2 TP3TP1
LED1
AppBox E54 CPU Board Interfaces
TP4
J5
J2
J3
J6

AppBox E54 System User’s Guide 12 AppBox
The table below lists all the interfaces on the AppBox E54 CPU Board.
AppBox E54 CPU BOARD INTERFACES
INTERFACE NAME TYPE OF INTERFACE
J1 Connector for power input
J2 Connector for RS-485/CAN
J3 USB Connector
J4 Ethernet Connector
J5 SD Card Connector
J6 Connector for header 5x2
Cortex-M Debug
EXT1 Connector to AppIO Module
EXT2 Connector to AppIO Module
EXT3 Connector to AppIO Module
JP1 SMT jumper (bottom)
JP2 SMT jumper (bottom)
JP3 SMT jumper (bottom)
JP4 SMT jumper (bottom)
JP5 SMT jumper (bottom)
JP6 SMT jumper (bottom)
JP7 SMT jumper (bottom)
JP8 SMT jumper (bottom)
SW1 Pushbutton switch
SW2 4 position DIP switch
LED1 Green LED
TP1 Test point
TP2 Test point
TP3 Test point
TP4 Test Point

AppBox E54 System User’s Guide 13 AppBox
3.1 Connectors
The following section describes the connectors on the AppBox E54 CPU Board.
INTERFACE NAME TYPE OF INTERFACE MATING CONNECTOR
J1 Connector for power input, 2
position
Amphenol Anytek
Terminal Block Plug, 2 pos
TJ0231530000G
TS02315A0000G
J2 Connector for RS-485/CAN,
10 position, 2 x 5
Molex 10 Position Rectangular
Housing Connector Receptacle
Natural 0.165" (4.20mm)
0039012100, 0039000038
J3 USB Connector USB micro
J4 Ethernet Connector RJ-45
J5 SD Card Connector Micro SD card
J6 Connector for header 5x2
Cortex-M Debug Cortex-M Debug tail
EXT1 Connector to AppIO Module #1,
20 position, 2 x 10
EXT2 Connector to AppIO Module #2,
20 position, 2 x 10
EXT3 Connector to AppIO Module #3,
20 position, 2 x 10
3.1.1 J1, Power Connector
This section describes J1, the power connector. Shown below is a physical diagram of the J1 connector.
The following table shows the signals present on the J1 connector.
J1, Power Connector
Pin number Signal name
1 DGND
2 VIN, (+12-24 VDC)
Pin 1, DGND Pin 2, +12-24V
J1, Power Connector
(card edge view)

AppBox E54 System User’s Guide 14 AppBox
3.1.2 J2, RS485 / CAN Connector
This section describes J2, the RS485/CAN connector. The diagram below shows the physical diagram of the
J2 connector.
The following table shows the signals present on the J2 connector.
J2, RS485 / CAN Connector
Pin number Signal name
1 RS485_A
2 RS485_B
3 DGND
4 CAN_H
5 CAN_L
6 JP8, VDD_5V if installed
7 DGND
8 No Connect
9 No Connect
10 DGND
Pin 5
,
No connect
J2, RS485/CAN Connector
Pin 6
,
Pin 2
,
JP7
Pin 10, DGND
Pin 1, RS-485
_A
(card edge view)

AppBox E54 System User’s Guide 15 AppBox
3.1.3 J3, USB Connector
The following table shows the signals present on the J3 connector. The J3 connector is female mini USB
connector.
J3, USB Connector
Pin number Connector Signal Name – Attach Signal Name
1 VBUS to Pin 5, U7
2 D- to USB_DM, Pin 1, U7, PA24_USB_DM
3 D_ to USB_DP, Pin 3, U7, PA25_USB_DP
4 ID to IO3, Pin 4, U7,PC19_USB_ID
5 GND to DGND, Pin 2, U7
6 Shield1, DGND via a capacitor
7 Shield2, DGND via a capacitor
8 Shield3, DGND via a capacitor
9 Shield4, DGND via a capacitor
10 Shield5, DGND via a capacitor
11 Shield6, DGND via a capacitor
3.1.4 J4, Ethernet Connector
The following table shows the signals present on the J4 connector.
J4, Ethernet Connector
Pin number Connector Signal Name – Attach Signal Name
1 TD+ to Pin 6, U11
2 TD- to Pin 5, U11
3 RD+ to Pin 4, U11
4 TCT to DGND via cap
5 RCT to DGND via cap
6 RD- to Pin 3, U11
7 No connect
8 CHS GND to Ground
9 GRN_A to VDD_3V3
10 GRN_C to LED0/ANEN_SPEED
11 YEL_C to PC15_ETH_LED
12 YEL_A to VDD_3V3
13 SH1 to Ground
14 SH2 to Ground
15 MH1, No connect
16 MH2, No connect

AppBox E54 System User’s Guide 16 AppBox
3.1.5 J5, SD Card Connector
The J5 SD card connector supports a micro SD memory card with a memory size up to xx GB. The following
table shows the signals present on the J5 connector.
J5, SD Card Connector
Pin number Connector Signal Name – uP Signal Name
1 DAT2 to PB20_MCDA2
2 DAT3 to PB21_MCDA3
3 CMD to PA20_MCCDA
4 VDD to VDD_3V3
5 CLK to PA21_MCCK
6 VSS to DGND
7 DAT0 to PA18_MCDA0
8 DAT2 to PB19_MCDA1
9 COM to DGND
10 CD to PD20_MC_DETECT
11 PAD1 to DGND
12 PAD2 to DGND
12 PAD3 to DGND
14 PAD4 to DGND
3.1.6 J6, Cortex-M Debug Connector
The following table show the signals present on the J6 connector.
J6, Cortex-M Debug Connector
Pin number Signal name
1 VDD_3V3, +3.3 volts
2 PA31_SWDIO
3 DGND
4 PA30_SWCLK
5 DGND
6 PB30_SWO
7 No Connect
8 No Connect
9 DGND
10 RESETn

AppBox E54 System User’s Guide 17 AppBox
3.1.7 AppIO Module Connectors
The E54 APP Board has 3 connectors which allow the AppBox E54 to be customized to meet specific
application requirements. By using function specific AppIO Modules the user can tailor their system
configuration to meet their unique requirements. The AppIO Modules can be plugged into any of the
3 connectors (EXT1, EXT2, EXT3). These 3 connectors are 20 pin, 2 x 10 double row, right angle
connectors with pins on 0.1 inch (2.54 mm) centers.
Note: The user should be aware that several signals from the AppBox E54 CPU are shared and present on
all 3 connectors. If the signals are used by one connector (AppIO Module) they should not be used on the
other connectors.
The following diagram shows the physical layout of the EXT1, EXT2, and EXT3 connectors.
Pin 1
Circuit board
E54 APP Board AppIO Board Connector
(card edge view)
Pin 2
Pin 19
Pin 20

AppBox E54 System User’s Guide 18 AppBox
3.1.7.1 EXT1, AppIO Module Connector
The following table shows the signals present on the EXT1 connector.
EXT1, AppIO Module Connector
Pin # Signal Name Function Shared Functionality
1 Pin 2, JP1 +5 volts to AppIO Module if
shorted VDD_5V
2 DGND Ground Ground
3 PB04_ADC(P) A/D converter, alternatively
positive part of differential ADC
4 PB05_ADC(N) A/D converter, alternatively
negative part of differential ADC
5 PA06_GPIO General purpose I/O
6 PA07_GPIO General purpose I/O
7 PB08_PWM(P) PWM, alternatively positive part of
differential PWM
8 PB09_PWM(N)
PWM, alternatively negative part
of differential PWM
9 PB07_IRQ/GPIO Interrupt request line and/or GPIO
10 PA27_SPI_SS_B/GPIO Slave select for SPI and/or GPIO
11 PA22_TWI_SDA Data line for I2C interface, always
implemented, bus type
12 PA23_TWI_SCL
Clock line for I2C interface, always
implemented, bus type
13 PA05_UART_RX Receiver line of target device
UART
14 PA04_UART_TX
Transmitter line of target device
UART
15 PB28_SPI_SS_A Slave select for SPI
16 PD27_SPI_MOSI
Master out slave out line of serial
peripheral interface, always
implemented, bus type
17 PD29_SPI_MISO Master in slave out line of serial
peripheral interface, always
implemented, bus type
18 PD26_SPI_SCK Clock for serial peripheral interface, always implemented,
bus type
19 DGND Ground Ground
20 VDD_3V3 Power for the AppIO Module Power for the AppIO Module

AppBox E54 System User’s Guide 19 AppBox
3.1.7.2 EXT2, AppIO Module Connector
The following table shows the signals present on the EXT2 connector.
EXT2, AppIO Module Connector
Pin # Signal Name Function Shared Functionality
1 Pin 2, JP2 +5 volts to AppIO Module if shorted VDD_5V
2 DGND Ground Ground
3 PB00_ADC(P) A/D converter, alternatively positive
part of differential ADC
4 PA03_ADC(N) A/D converter, alternatively
negative part of differential ADC
5 PB01_GPIO General purpose I/O
6 PB15_GPIO General purpose I/O
7 PB14_PWM(P) PWM, alternatively positive part of
differential PWM
8 PB15_PWM(N)
PWM, alternatively negative part of
differential PWM
9 PD00_IRQ_GPIO Interrupt request line and/or GPIO
10 PB02_SPI_SS_B/GPIO Slave select for SPI and/or GPIO
11 PD08_TWI_SDA Data line for I2C interface, always
implemented, bus type
12 PD09_TWI_SCL
Clock line for I2C interface, always
implemented, bus type
13 PAB17_UART_RX Receiver line of target device UART
14 PB16_UART_TX Transmitter line of target device
UART
15 PC06_SPI_SS_A Slave select for SPI
16 PC04_SPI_MOSI Master out slave out line of serial
peripheral interface, always
implemented, bus type
17 PC07_SPI_MISO Master in slave out line of serial
peripheral interface, always
implemented, bus type
18 PC05_SPI_SCK
Clock for serial peripheral interface,
always implemented, bus type
19 DGND Ground Ground
20 VDD_3V3 Power for the AppIO Module Power for the AppIO Module

AppBox E54 System User’s Guide 20 AppBox
3.1.7.3 EXT3, AppIO Module Connector
The following table shows the signals present on the EXT3 connector.
EXT3, AppIO Module Connector
Pin # Signal Name Function Shared Functionality
1 Pin 2, JP3 +5 volts to AppIO Module if shorted VDD_5V
2 DGND Ground Ground
3 PC02_ADC(P) A/D converter, alternatively positive
part of differential ADC
4 PC03_ADC(N)
A/D converter, alternatively negative
part of differential ADC
5 PC01_GPIO General purpose I/O LED1
6 PC10_GPIO General purpose I/O, SW1
7 PD10_PWM(P) PWM, alternatively positive part of
differential PWM
8 PD11_PWM(N)
PWM, alternatively negative part of
differential PWM
9 PC30_IRQ/GPIO Interrupt request line and/or GPIO
10 PC31_SPI_SS_B/GPIO Slave select for SPI and/or GPIO
11 PD08_TWI_SDA Data line for I2C interface, always
implemented, bus type Pin 11, EXT2, Pin 5, U2
12 PD09_TWI_SCL Clock line for I2C interface, always
implemented, bus type Pin 12, EXT2, Pin 6, U2
13 PC23_UART_RX Receiver line of target device UART
14 PC22_UART_TX Transmitter line of target device
UART
15 PC14_SPI_SS_A Slave select for SPI
16 PC04_SPI_MOSI Master out slave out line of serial
peripheral interface, always
implemented, bus type Pin 16, EXT2
17 PC07_SPI_MISO Master in slave out line of serial
peripheral interface, always
implemented, bus type Pin 17, EXT2
18 PC05_SPI_SCK
Clock for serial peripheral interface,
always implemented, bus type Pin 18. EXT2
19 DGND Ground Ground
20 VDD_3V3 Power for the AppIO Module Power for the AppIO Module