CL-SOM-iMX6UL: Evaluation Kit: Hardware Guide
Contents
Overview
Terms and Definitions
Term Definition Evaluation kit A combination of CL-SOM-iMX6UL & SB-SOM boards accompanied by a set of accessories detailed here CL-SOM-iMX6 A system-on-module product described here SB-SOM A generic carrier board designed to support several ARM evaluation kits from Compulab. SB-SOM-iMX6UL SB-SOM board assembly compatible with CL-SOM-iMX6UL system-on-module. SoM system-on-module Reference Carrier Board
The evaluation kit is shipped with a special assembly of the SB-SOM carrier board - SB-SOM-iMX6UL.
The design materials for SB-SOM (including schematics, PCB layout and Bill of Materials) are available for download from here
Additional resources
Carrier Board
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The drawing represents a generic SB-SOM board. Some connectors might not be populated in CL-SOM-iMX6UL evaluation kit. |
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Interfaces and Functions
Main Power
Evaluation kit main power can be provided from either a Li-Poly battery, or a DC power source.
Option 1 - DC only
Connector J6 is the main 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 J6.
Option 2 - Li-Poly Battery
Battery powered operation of the evaluation kit is supported through the main battery connector P19. The evaluation kit is shipped with an accessory battery adapter allowing P19 connection to custom batteries. Please refer to battery specification for details on supported batteries.
Main Battery Charging
This evaluation kit supports main battery charging when both power sources (Battery + DC) are available. The DS1 LED indicates battery charging is in progress. Detailed status of the battery and charging process is available to software through I2C access to the SB-SOM-iMX7 on-board battery charger (U25 in SB-SOM schematics) and charging supervisor (U24 in SB-SOM schematics).
More Details: Connector J6, Connector P19, Battery Specification.
SD/MMC
SDCARD support is available by SDCARD slot P9. Make sure to install jumper on P5-25 and P5-26 pins to enable SDCARD support on SBC-iMX6UL.
Serial Console
Serial console is available through one of the following interfaces:
- Serial over USB using micro-USB2.0 Type-B P7 connector. Continue to USB console guide for USB interface setup instructions.
- Serial over RS-232 using the P8 connector with custom RS-232 cable (included with the evaluation kit). Continue to RS-232 console guide for RS-232 interface setup instructions.
More Details: Connector P7, Connector P8, USB console guide, RS-232 console guide.
USB
All of the 5 CL-SOM-iMX6UL USB ports are accessible with this evaluation kit:
- CL-SOM-iMX6UL Native USB Port 1 is available through the OTG connector P3 (only USB2.0 part of the connector is utilized).
- USB Host connection: The micro-USB to USB type-A adapter included with evaluation kit (available for purchase here) allows usage of connector P3 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.
- CL-SOM-iMX6UL Native USB Port 2 is available through one of the following connectors, depending on the state of jumper E7.
- E7 not populated: SB-SOM-iMX6UL onboard USB hub utilizes CL-SOM-iMX6UL Native USB Port 2 as upstream port. Only Dual stacked USB2.0 *P6* connector and *P16* mini-PCI-express connector are enabled.
- E7 populated: Only P26 USB2.0 connector is enabled.
- CL-SOM-iMX6UL onboard USB hub ports are accessible through the P5 100mil header. Using the CONUSB adapter included with the evaluation kit (available for purchase here), allows connection of standard USB2.0 devices to these ports. P5 pins used for each port are shown in table below
Pin Name HUB port 1 HUB port 2 HUB port 3 Power 5V P5-27 P5-19 N/A Negative Data P5-29 P5-21 P5-1 Positive Data P5-31 P5-23 P5-3 GND P5-33 P5-25 N/A
More Details: Connector P3, Connector P6, Connector P16, Connector P26, Connector P5.
CAN
Two steps are required in order to utilize the CAN bus interface available with the evaluation kit.
- Use jumper wires to connect 100mil header pins where CAN bus functionality is available (multiplexed), to the P23 CAN header, as shown below:
- Use a jumper wire to connect pin P4-2 to P23-1 onboard the evaluation kit.
- Use a jumper wire to connect pin P4-1 to P23-4 onboard the evaluation kit.
- CAN bus nodes can be connected to evaluation kit header P5 as described in CAN node connection guide.
More Details: Connector P4, Connector P23, Connector P5, CAN node connection guide.
Ethernet
The kit features 100Mbit copper Ethernet port.
The Ethernet port is available through RJ45 connector P21.
More Details: Connector P21.
Wireless
WiFi/Bluetooth
Connect both antennas (included with evaluation kit) to CL-SOM-iMX6UL connectors J1 and J2 for WiFi and/or Bluetooth operation. Make sure there is no jumper installed on P5-25 & P5-26 pins to enable the WiFi module support on SBC-iMX6UL.
Cellular
USB interface cellular modems (2G/3G/4G etc.) can be plugged into connector P16 (mini-PCI-Express) as explained below:
- Remove jumper E7 to enable USB interface on P16. DS6 LED indicates USB interface availability at P16.
- Plug your modem into P16 mini PCI-Express connector (only USB interface is available for modem).
- Insert your micro-SIM card into the P13 micro-SIM slot (only relevant if your cellular modem requires a sim card access while not featuring an onboard SIM slot).
More Details: Connector P16, Connector P13.
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 CL-SOM-iMX6UL Yocto Linux demo image. Connect the LCD panel the evaluation kit through the FPC connector P10.
More Details: Connector P10.
System
Reset
Pressing the reset button (SW2) triggers evaluation kit cold reset.
Boot Sequence Selection
Evaluation kit supports normal and alternate boot sequences. Detailed description of the sequences is available in the CL-SOM-iMX6UL reference guide.
- Pressing and holding the ALT.BOOT button (SW3) during power-up or cold reset forces alternative boot sequence.
- Populating the E1 jumper, constantly forces alternative boot sequence.
- Indication of selected boot sequence is shown with the DS12 LED.
Power ON / Cycle
- A short press of the PWRDn button (SW1) while system is operational, generates an OFF request to be serviced by software.
- A long (>5Sec) press of the PWRDn button (SW1) while system is operational, unconditionally shuts down the system (same as simply removing power source).
- A short press of the PWRDn button (SW1) while system is off, triggers the system start-up sequence.
RTC
The evaluation kit RTC (implemented onboard CL-SOM-iMX6UL) is powered by a coin cell battery. RTC power can be disconnected by:
- Removing the coin cell battery.
- Removing jumper E8.
To quickly discharge the RTC power, momentarily short pins 1 and 2 of jumper E8.
Multi functional signals access
Camera
Part of the CL-SOM-iMX6UL camera interface signals are accessible through the evaluation kit P18 header.
Please refer to CL-SOM-iMX6UL reference guide and SB-SOM schematics for details.
UART
CL-SOM-iMX6UL UART interfaces are partially accessible through headers P4, P5 and P18.
Please refer to CL-SOM-iMX6UL reference guide and SB-SOM schematics for details.
SPI
CL-SOM-iMX6UL SPI interface signals are partially accessible through headers P4 and P18.
Please refer to CL-SOM-iMX6UL reference guide and SB-SOM schematics for details.
I2C
CL-SOM-iMX6UL I2C interface signals are partially accessible through headers P4 and P18.
Please refer to CL-SOM-iMX6UL reference guide and SB-SOM schematics for details.
GPIO
Some of the CL-SOM-iMX6UL GPIO signals are accessible through headers P4, P5 and P18.
Please refer to CL-SOM-iMX6UL reference guide and SB-SOM schematics for details.
More Details: Connector P4, Connector P5, Connector P18.
Jumpers Summary
- E1 - Boot Sequence/Production.
- E2 - CL-SOM-iMX6UL onboard board specific data EEPROM write-protection.
- E3 - Serial console interface auto detection.
- E4 - SB-SOM board specific data EEPROM write-protection
- E5 - LVDS display connector P11 power source selection.
- E6 - LVDS display connector P11 power source selection.
- E7 - Control of USB interface accessibility through either P26 USB2.0 connector or P6 and P16.
- E8 - RTC coin cell connection
- P5-25 & P5-26 - CL-SOM-iMX6UL SDIO mux select. Install jumper to select SD/MMC interface, leave it open for WLAN functionality.
More Details: Connector P11, Connector P6, Connector P16, Connector P26, USB console guide, RS-232 console guide.
