CM-T335: Evaluation Kit: Hardware Guide

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Overview

Terms and Definitions

Term Definition
Evaluation kit A combination of CM-T335 & SB-T335 boards accompanied by a set of accessories detailed here
CM-T335 A system-on-module product described here
SB-T335 A carrier board designed to support CM-T335 evaluation kit from Compulab.
SoM system-on-module

Reference Carrier Board

The evaluation kit is shipped with SB-T335-EVAL.

The design materials for SB-T335 (including schematics, PCB layout and Bill of Materials) are available for download from here

Additional resources

Carrier Board Interfaces and Functions

Main Power


Evaluation kit main power can be provided from DC power source. Connector J2 is the DC power source of thе evaluation kit. The DC power supply unit included with the evaluation kit provides 12V DC power to the system through J2.

Serial Console


Serial console is available through serial over RS-232 using the P11 connector. A custom RS-232 cable is included with the evaluation kit.

USB


All of the CM-T335 USB ports are accessible with this evaluation kit:

  1. CM-T335 Native USB Port 0 (U1 option) is available through the OTG connector P19.
    • USB Host connection: The micro-USB to USB type-A adapter included with evaluation kit (available for purchase here) allows usage of connector P19 as a standard USB2.0 host port.
    • USB Gadget connection: A standard micro-USB cable (included with evaluation kit) enables connection of the evaluation kit as a USB gadget to the USB port of your host computer.
  2. CM-T335 onboard USB hub ports (U4 option) are accessible through the P25, P26, P27 and P28 ports.

Ethernet


The kit features GbE copper Ethernet port. The Ethernet port is available through RJ45 connector P2.

Wireless


WiFi/Bluetooth

Connect both antennas (included with evaluation kit) to CM-T335 (WB option) connectors J1 and J2 for WiFi and Bluetooth operation.

Display


Evaluation kit supports display interfaces listed below (not simultaneously). Selection of active display interface is set by software.

LCD

LCD panel (included with evaluation kit) is the display enabled by default with CM-T335 Linux demo image. Connect the LCD panel the evaluation kit through the FPC connector P5.

DVI

The DVI display interface is accessible through the HDMI connector J1.

System


Boot Sequence Selection

Evaluation kit supports normal and alternate boot sequences. Detailed description of the sequences is available in the CM-T335 reference guide.

  • Pressing and holding the ALT.BOOT button during power-up or cold reset forces alternative boot sequence.

RTC

The evaluation kit RTC (implemented onboard CM-T335) is powered by a coin cell battery. RTC power can be disconnected by:

  • Removing CM-T335 from SB-T335.

Multi functional signals access



UART

CM-T335 UART interfaces are partially accessible through headers P20.

Please refer to CM-T335 reference guide and SB-T335 schematics for details.

SPI

CM-T335 SPI interface signals are partially accessible through headers P20.

Please refer to CM-T335 reference guide and SB-T335 schematics for details.

I2C

CM-T335 I2C interface signals are partially accessible through headers P20.

Please refer to CM-T335 reference guide and SB-T335 schematics for details.

GPIO

Some of the CM-T335 GPIO signals are accessible through headers P20.

Please refer to CM-T335 reference guide and SB-T335 schematics for details.