Linux SoM
Here is a list of examples on how to wire components, power supplies, connectors, sensors, etc to the Aria G25 SoM to create your own Linux embedded board.
These examples are not intended for end user products but are just for quickly labs experiments.
To learn how to design a good product with Aria G25 take a look to the Terra Board SBC schematic.
Aria G25 needs just 5 wires to have a working 10/100 MBit LAN port and a RJ45 ethernet connector (with embedded line tranformers).
These are the lines used:
| Aria pins | Ethernet connector pins |
|---|---|
| W2 (ETH RX+) | 3 (TX+) |
| W3 (ETH RX-) | 6 (TX+) |
| W4 (ETH TX+) | 1 (RX+) |
| W5 (ETH TX-) | 2 (RX-) |
| W6 (ETH 3V3) | 4 (RCT) and 5 (TCT) |
Other 3 wires are required to have the link-up and traffic leds working. On this scheme is illustrated how to wire the leds integrated in our LAN connector but it is possible to use also two simple leds (no resistors are required).
These are the lines used:
| Aria pins | Ethernet connector pins |
|---|---|
| W8 (ETH green link led) | 9 (Green led anode) |
| W7 (ETH yellow traffic led) | 12 (Yellow led anode) |
| W1 (GND) | 10 (Green led cathode) and 11 (Yellow led cathode) |
 | RJ45 LAN Transformer Ethernet 10/100 Base-T connector |
Up to 3 USB 2.0 host ports are available on Aria G25 module:
One of the hi-speed port can be used as device port.
The pin used are:
| Aria pins | Port | Description | Mode |
|---|---|---|---|
| E18 (D-), E19 (D+) | Port A | High Speed (480 Mbps) | Host or Device |
| E15 (D-), E16 (D+) | Port B | High Speed (480 Mbps) | Host |
| E12 (D+), E13 (D-) | Port C | Full Speed (12 Mbps) | Host |
Here is a simple but working scheme. The +5VDC line can be wired directly on the PS3V3 output power line for example. See the power line wiring for more info.
 | USB A host connector |
Aria G25 can load from a SD card all the software it needs.
Lines used:
| Aria pins | SD card pins |
|---|---|
| S1 (3V3) | 4 (VDD) |
| S3 (DA3) | 1 (DAT3) |
| S4 (DA2) | 9 (DAT2) |
| S5 (DA1) | 8 (DAT1) |
| S6 (CK) | 5 (CLK) |
| S7 (CDA) | 2 (CMD) |
| S8 (DA0) | 7 (DAT0) |
| S24 (GND) | 3 (VSS1) and 6 (VSS2) |
Aria G25 can load from a microSD card all the software it needs.
Lines used:
| Aria pins | MicroSD card pins |
|---|---|
| S1 (3V3) | 4 (VDD) |
| S3 (DA3) | 2 (DAT3) |
| S4 (DA2) | 1 (DAT2) |
| S5 (DA1) | 8 (DAT1) |
| S6 (CK) | 5 (CLK) |
| S7 (CDA) | 3 (CMD) |
| S8 (DA0) | 7 (DAT0) |
| S24 (GND) | 6 (VSS) |
 | 1.10mm pitch microSD memory holder push-push type |
 | 1.10mm pitch microSD memory holder, hinge Type, |
 | Bootable 4GB class 4 microSD memory card with a preinstalled Debian Linux distribution for the Aria G25 board. Please note that this card contains Open Source code under GPL licence and you are buying just the memory card not the software on it. Any rights on this software or support are not included. | How to make by yourself this memory card using a blank microSD | |
 | Bootable 8GB class 4 microSD memory card with a preinstalled Debian Linux distribution for the Aria G25 board. Please note that this card contains Open Source code under GPL licence and you are buying just the memory card not the software on it. Any rights on this software or support are not included. | How to make by yourself this memory card using a blank microSD | |
 | Bootable 16GB class 4 microSD memory card with a preinstalled Debian Linux distribution for the Aria G25 board. Please note that this card contains Open Source code under GPL licence and you are buying just the memory card not the software on it. Any rights on this software or support are not included. | How to make by yourself this memory card using a blank microSD | |
Aria G25 needs a single line 3.3 volt DC power supply which can be provided in any combination on the following pins:
| Power lines | Aria pins |
|---|---|
| +3V3 DC power in | N1, S1, E24, W24 |
| GND signal ground | N24, S24, E1, W1 |
A simple and cheap module called PS3V3 is available from Acme SYstems.
It has a miniUSB connector and can
be integrate in your PCB as a SMD component.
 | SMD power supply module for Aria G25 based custom boards | More info... | |
If you need to get the power in an industrial or mobile environment here is illustrated a simple solution using this two modules:
In this way is is possible to provide to Aria from a 7 to 28 Volt DC source.
 | Power supply module that meets all the AT91SAM9G20 CPU power requirements and power-up and power-down sequences to guarantee reliable operations. | More info... | |
 | EPS is a DC-DC converter with an input range of 7 to 28 Volt DC output 5 Volt DC @ 2A. | More info... | |
Following is a simple example on how to wire a led or a push-button.
We used just two lines in this example but more lines are available and every one is configurable either in input or output mode: see the Aria G25 pinout.
To learn how to drive the led or read the push-button state visit this article: GPIO lines.
All the lines are at 3.3 Volt. Do not connect any 5 Volt logic level signals to avoid damages.
The Microsoft Lifecam HD3000 is a cheap true 720p HD 16:9 hi-res webcam with integrated mic.
Removing the plastic shield and usb cable the internal circuitry is just 34x20x6 mm size perfect to be used with the Aria G25 module.
Using the hi_speed USB port A or B it is possible to stream mjpg video at 1280x720 pixel @ 30fps.
| Aria pins | HD-3000 |
|---|---|
| E19 (D+) | Green (D+) |
| E18 (D-) | White (D-) |
| Red (+5V) | |
| E17 (GND) | Black (GND) |
 | Microsoft LifeCam HD-3000 webcam |
 | Microsoft LifeCam HD-5000 webcam |
| USB A host connector |
Applying 3 Volt DC on E1 (GND) and E20 (VBAT +3VDC) it is possible to mantaint the RTC (Real Time Clock) active when the power supply if off. This will mantain the system clock up to 6 months with no power using a small CR1220 Lithium battery.
A bigger battery can be used to extend the time duration.
 | Battery holder for lithium battery CR1220. Through hole mount. |
 | Battery holder for lithium battery CR1220. SMT mount. |
 | Lithium battery model CR1220 at 3 volt for RTC circuitry on: |
The debug port is a special serial port used by the RomBOOT firmware burned inside the CPU ROM, the boot loader and the Linux Kernel loaded from the SD memory card to send the systems messages during their execution. The debug port is used also to have a low level access to the Linux system console.
The asyncronous serial signals are available on these pins:
| Aria pins | Signals |
|---|---|
| S13 | Debug port TXD |
| S14 | Debug port RXD |
| S24 | GND |
This are 3.3 volt level lines so an adapter is required to access them using a PC USB or RS232 serial port and have access to this system console using a terminal emulator.
This scheme shows how to wire the Acme Systems DPI interface but any other 3.3 volt to USB os RS232 serial converter can be used.
 | DPI is an USB-to-serial interface to link the Acme boards debug port to a PC USB host port and have access at the Linux system console using a terminal emulator program like minicom, putty, hyperterminal, etc. | More info... | |
The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature measurements. It communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. It has an operating temperature range of -55°C to +125°C and is accurate to ±0.5°C over the range of -10°C to +85°C. (read more...).
Lines used as 1-wire bus:
| Aria pins | Signals |
|---|---|
| S1 | 3V3 |
| S2 | 1-wire data |
| S24 | GND |
 | DS18B20 is a digital thermometer provides 9-bit to 12-bit Celsius temperature measurements. |
All the signals on the Aria G25 board are at 3.3 Volt. Do not connect 5 Volt logic level signals to these pins or the board will be damaged.
If you used Arduino boards please pay attention to this aspect.
 | Aria G25 is a small and low-cost multi-chip module that integrates:
| More info... | |
 | Aria G25 is a small and low-cost multi-chip module that integrates:
| More info... | |
 | Aria G25 is a small and low-cost multi-chip module that integrates:
| More info... | |
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Documentation Terms of Use
Acme Systems provides this documentation "as is" without warranty or guarantees of any kind.
The mantainer of this site (Sergio Tanzilli), has gone to a great deal
of effort into making this documentation as correct as possible.
Acme Systems doesn't provide any direct support for the Open Source preinstalled software but provides, through
these pages and forum posts, all the information required to obtain the sources, install, use and update the
Open Source softwares runnable on the FOX Board, NetusG20, AriaG25 and Terra platforms.
Please note that all the preinstalled softwares, used on the Acme Systems products, are Open Source and you will
have to check the license terms provided (usually the GPL) by each author before using it in any commercial or non-commercial
product, by yourself.
Before sending emails or calling the Acme staff here are our contacts
please note that WE ARE MAINLY HARDWARE DESIGNERS and NOT LINUX GURUS so could be better to post
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