Critical Link, LLC
www.CriticalLink.com
MitySOM-335x Development Kit
6 March 2014
FEATURES
MitySOM-335x Development Board
MitySOM-335x SoM Module
Additional Hardware Included:
RS485/422 Expansion Kit
RS232 Expansion Kit
Serial & Ethernet Cables
AC to DC 12V 1.2A Adapter
Integrated +3V/+5V Power Supplies
Digital Interfaces:
HDMI Video Only Interface with
2048x2048 maximum resolution
Audio Output and Microphone Input
10/100/1000 MBit Ethernet Interface
8-Channel ADC
RS-232 Serial Interface
USB Host Interface
USB OTG Interface
Dual Electrically Isolated CAN Bus
Interfaces
SD/MMC Card Socket
Software and Documentation:
Real-Time Linux Kernel
uBoot
Development Environment - Virtual
Machine
Development Board Schematics
Development Board Gerber Files
Development Board BOM
APPLICATIONS
MitySOM-335x Evaluation
Process Automation
Factory Automation
Industrial Automation
Embedded Instrumentation
Rich Displays
Rapid Prototyping
Expansion
2 UART Expansion Headers
41-Pin with SPI, I2C and GPIO
LCD Interface
DESCRIPTION
The MitySOM-335x Development Kit provides all the hardware and software support for
system designers and developers to evaluate the Critical Link MitySOM-335x System on
Module. The MitySOM-335x Development Kit comes complete with the MitySOM-
335x module that meets your project’s needs.
The MitySOM-335x Development Kit includes on-board RS-232, 10/100/1000 GBit
Ethernet, Universal Serial Bus (USB 2.0) Host and USB-On-The-Go (OTG)
communication interfaces. Dual electrically isolated CAN and dual UART expansion
ports provide a wide range of communication interfaces. Included are RS232 and
RS485/422 expansion kits from Critical Link, Table 18.
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Copyright © 2007-2013, Critical Link LLC
Critical Link, LLC
www.CriticalLink.com
MitySOM-335x Development Kit
6 March 2014
The High-Definition Multimedia Interface (HDMI) supports displays up to a resolution
of 2048 x 2048 through a standard HDMI connector, video only. An interface to support
an XGA LCD display with SPI or ADC interfaces for resistive touch control is available
via an expansion kit, Table 18. Multi Media Card (MMC) interface supporting Secure
Digital (SD) cards and an I/O Expansion connector for an 802.11b/g/n Wireless with
Bluetooth module from Critical Link, Table 18, or a user designed custom add-on card.
All powered from a single 12VDC input with onboard +3V/+5V power supplies.
A block diagram of the MitySOM-335x Development Kit is illustrated in Figure 1 on the
following page. All available processor GPIO ports are used directly by the MitySOM-
335x Development Kit. Control of the on-board interface hardware and connected
Expansion IO cards require proper configuration of the MitySOM-335x Module. While
not required, it is strongly recommended that the MitySOM software development kit and
supplied API be used to manage these interfaces.
2
Copyright © 2007-2013, Critical Link LLC
Critical Link, LLC
www.CriticalLink.com
MitySOM-335x Development Kit
6 March 2014
MitySOM-335x Development Kit
HID / Thumb drive
USB-A
Connector
Mini-USB
Connector
SD
Connector
10-pin Header
10-pin Header
10-pin Header
10-pin Header
1/8" jack
1/8" stereo
jack
Filter
TLV320AIC26
Audio Line Out
Ethernet 10/100/1000
Modbus TCP
EtherCAT Master
Filter
ISO 1050
ISO 1050
PC
SD Card
UART Expansion
1
UART Expansion
2
CAN 1
CAN 2
Microphone Input
RJ-45 &
Magnetics
Ethernet PHY
Texas Instruments
Sitara AM335x
Up To 1GHz
Cortex-A8
LCD
Standard HDMI Display
HDMI Jack
TFP410
Transmitter
(Optional) XGA LCD
LCD / Touch 34-pin
Header
0-10V Signal
Conditioning
RS232 Driver
8 SAR ADC Inputs
10-pin Header
335x Module Serial Port
DB-9 Header
(Optional) WiFI /BT
Or
GPIO Usage
41-Pin Expansion
Header
I2c & SPI &
16 GPIO
+12V
Power
Management
+5V ISO 1 (CAN 1)
+5V ISO 2 (CAN 2)
+5V
+3.3V
Battery
(RTC)
MitySOM-335x
Figure 1: MitySOM-335x Development Kit Block Diagram
Additional details about the AM335x Sitara ARM MPU, available peripherals and their
features are provided in the data sheet at the TI website (www.ti.com/am335x).
3
Copyright © 2007-2013, Critical Link LLC
Critical Link, LLC
www.CriticalLink.com
MitySOM-335x Development Kit
6 March 2014
Feature Descriptions
RS-232 Interface Description .......................................................................................... 5
Dual UART Expansion Port Description ......................................................................... 5
Audio Input/Output Description ...................................................................................... 5
USB 2.0 Interface Description ......................................................................................... 5
MultiMedia Card (SD) Interface Description ................................................................... 5
Gigabit Ethernet Interface Description ............................................................................. 5
XGA LCD with Touch Interface Description ................................................................... 6
HDMI (Video Only) Interface Description ...................................................................... 6
8-Channel Analog to Digital Converter Description......................................................... 6
Dual CAN Interface Description ...................................................................................... 6
Expansion Port Interface Description............................................................................... 7
Boot Configuration Header Description ........................................................................... 7
TI JTAG Interface Description ........................................................................................ 7
Electrical Interface Descriptions
Input Power – J601.......................................................................................................... 9
Analog to Digital Converter Interface – J900 ................................................................... 9
MultiMedia Card (SD) Interface – J501 ........................................................................... 9
Auxiliary / LCD Interface – J401................................................................................... 10
HDMI Interface – J400 .................................................................................................. 12
Expansion Port Interface – J700 .................................................................................... 12
Debug/Boot RS232 Interface – J507 .............................................................................. 14
Dual CAN Interface – J503 & J504 ............................................................................... 14
UART Expansion Interface Port0 - J506 (Use with 80-000450 and 80-000358)............. 15
UART Expansion Interface Port1 - J505 (Use with 80-000450 and 80-000358)............. 15
10/100/1000 Ethernet Interface – J200........................................................................... 16
Audio Input/Output Interface – J300 and J301 ............................................................... 16
Boot Configuration header – J106 ................................................................................. 17
TI JTAG Interface – J101 .............................................................................................. 17
4
Copyright © 2007-2013, Critical Link LLC
Critical Link, LLC
www.CriticalLink.com
RS-232 Interface Description
MitySOM-335x Development Kit
6 March 2014
The on-board RS-232 level driver provides a standard serial interface at data rates up to
115,200 baud. The serial interface, J507, is routed to the primary MitySOM serial
bootloading port, UART0, in order to allow remote code download and FLASH upgrades
on an attached MitySOM from this connector.
Dual UART Expansion Port Description
The dual UART expansion ports each contain a set of TX and RX connections as well as
an enable GPIO from the MitySOM-335x module. A custom user designed driver board
can be designed to provide any desired signaling or you can select an off-the-shelf
solution available from Critical Link for RS232 and RS485/422 drivers. Each MitySOM-
335x Development includes both a RS232 and RS485/422 driver expansion kits, Table
18.
The electrical interfaces are provided via J505 and J506, 10-pin shrouded headers. HW
flow control is not supported on these interfaces.
Linux Driver and API examples are available to support the UART functionality.
Audio Input/Output Description
Standard 3.5mm / 1/8
th
inch audio jacks are provided for both stereo audio output and a
microphone audio input from/to a TLV320AIC26 16-bit audio CODEC connected to the
MitySOM-335x module.
The electrical interfaces are provided via 1/8
th
inch jacks J300, Audio Out, and J301,
Microphone In.
Linux Driver and API examples are available to support the audio functionality.
USB 2.0 Interface Description
The on-board USB interface utilizes dedicated HOST, A type connector J502, and OTG,
mini B type connector J500, controllers inside Sitara processor. Linux drivers are
available.
MultiMedia Card (SD) Interface Description
The on-board MultiMedia Card (MMC) slot uses a Secure Digital connector J501 which
supports standard (3.3V) and SDHC (1.8V) cards up to 32GB. U-Boot configuration
information and Linux drivers are available.
Gigabit Ethernet Interface Description
The on-board Ethernet interface features a network PHY capable of running at
10/100/1000Mbit including link auto-negotiation and MII/MDIO capability. An industry
standard RJ-45 connector is provided for external connection. This Ethernet interface
may be used to perform remote code download via U-Boot and FLASH upgrades on an
attached MitySOM-335x module.
5
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