Acqua technical documentation

Acqua - System On Module

Linux embedded system on module designed around the Microchip SAMA5D31 Cortex-A5@536 MHz MPU

Main features

  • Long term availability
  • Linux Kernel 4.19 - Debian Buster - Buildroot 2020 - Yocto
  • Single core CPU ARM Cortex-A5 (armhf) @ 536MHz (more info...):
  • DDR2 RAM 256 or 512 MB @ 32 bit
  • Nand FLASH 0 or 256 MB
  • MicroSD holder hinge type
  • AT24MAC402 chip on-board:
    • Factory programmed unique EUI-48 MAC address for eth0 interface
    • I2C-Compatible (2-wire) 2-Kbit Serial EEPROM
    • Embedded Unique 128-bit Serial Number
  • 10/100 Mbit ethernet interface
  • Power control on eth port for power safe applications
  • 3 USB Host ports (one configurable as USB device)
  • 24 bit LCD controller and resistive touch panel I/F
  • 4 status leds
  • Single power supply at 3.3 Volt DC
  • 3x50 pin connectors pitch 1.27 mm (50 mils)
  • Floating Point Unit
  • Available temperature ranges:
    • Commercial: -0 +70 °C
    • Extended: -25 +85 °C
  • Size: 53 x 53 mm (2.09 x 2.09 inches)
  • Weight: 14g
  • Placement for metal shield for harsh environment
  • AES/DES encryption engine
  • Software compatible with SAMA5D3 Xplained board
  • PCB layers: 10
  • Low power consumption
  • Low EMI
  • CE, RoHS and REACH compliant
  • Designed and Made in Italy
  • No Acme Systems brand printed on-board

Exposed signals

  • 10/100 Mbit ethernet phy
  • RGB i/f @ 24 bit for LCD TFT
  • Resistive touch panel i/f
  • TWI compatible I2C i/f (up to 3)
  • SPI bus i/f (up to 2)
  • GPIO lines (up to 120)
  • A/D @ 12 bit (up to 12)
  • Timer counters (up to 2)
  • Serial ports (up to 6)
  • 3 USB Host, 1 USB device
  • Memory Card i/f (up to 2)
  • ITU-R BT 601/656 image sensor i/f
  • PWM (up to 6)
  • SSC-I2S audio i/f (up to 2)
  • Programmable clock (up to 3)
  • JTAG port on pads
  • Debug serial port
  • Battery input for internal RTC

MicroSD hinge type holder

To open the Acqua microSD holder apply a gentle pression to the metallic shield then shift it ahead.

Metallic shield for harsh environment

If you plan to use Acqua A5 in an electromagnetic noisy environment (for example near DC motors) it is possible to place a metallic shield made by Wurth Elektronik to better protect the board from external EMI.

This shield is composed by two parts:

  • a metallic open frame to be welded to the board
  • a removable metallic cover

Software features

  • This board is fully supported inside the Linux Kernel main stream Thanks to this fact it is possible to try also the very latest Kernel releases. On this site we'll release up to the latest longterm versions.
  • All the kernel drivers are fully open source and available directly on the official Linux repository.
  • On the main index is available the step-by-step documentation to install Linux from scratch.
  • Ready-to-use binary images are available on the download page
  • Ready-to-buy-and-use microSDs are also available on our Acme Systems eShop
  • Thousands of open source applications are available from the Debian and Buildroot repositories.
  • ARMHF is the architecture to select for RoadRunner and Acqua boards. ARMEL is the architecture to select for Aria and Arietta boards.

Berta A5 - Evaluation board for Acqua SoM


Evaluation boards for Acqua A5 Linux Embedded SoM with power supply section, ethernet ad USB connectors


  • Ethernet 10/100
  • 2 USB 2.0 host hi-speed port
  • 1 USB 2.0 device hi-speed port or USB 2.0 host hi-speed port or placement for a WIFI-2 WiFi module.
  • Power supply at 5 volt DC via miniUSB connector
  • Placement for Acqua A5 SoM
  • All the Acqua lines not used by the on-board components are available on pads pitch 2.54 mm (100mils)
  • DPI port placement
  • Size 10x10 cm
  • Schematic in pdf format

More info


Breakout and evaluation boards for Acqua A5 Linux Embedded System on Module


  • Placement for Acqua A5 SoM
  • All the Acqua lines are available on pads pitch 2.54 mm (100mils)
  • DPI port placement
  • Size 10x10 cm

More info

BOM origins

Component Brand and Origin
CPU Microchip Technology Incorporated (USA)
RAM Micron Technology (USA) , Samsung (South Corea), Hynix (South Corea), Elpida (Japan), Alliance (USA)
PCB Rayming PCB (China)
Quartz IEV Industria Elettronica Varese (Italy)
MicroSD holder JAE (Japan), other vendors (China)
Passive Yageo, Panasonic, Taiyo Yuden, Samsung, Vishay, Bourns, other vendors (China)
Connectors Hirose (USA), Wurth Elektronik (Germany), other vendors (China)
WiFi module Various vendors (China)

Acqua technical documentation