Diamond Systems Zeta


The Zeta COM Express SBC family of ultra-small embedded computer boards combines a COM Express Mini CPU module with a same-size carrier board to create a complete embedded PC. Designed in the COM Express Mini Type 10 form factor (84 x 55mm/ 3.3 x 2.2 in), Zeta provides an ultra-compact, industry-standard form factor solution.

3 key components pre-assembled:

  • A Computer on Module (COM) providing the core CPU functionality
  • A carrier board providing the I/O transceivers and connectors, power supplies, and expansion sockets
  • A heat spreader with a flat exterior surface for direct mounting and heat transfer to the system enclosure

This layered architecture offers the highest functional density for any given footprint. As a comparison, Zeta offers functionality and performance equivalent to Diamond's top-selling Aries SBC at just 40% of the size.

Zeta currently supports three processor options: 

  • Intel Bay Trail E3825 1.33GHz dual-core CPU with 2GB RAM
  • Intel Bay Trail E3845 1.91GHz quad-Core CPU with 2GB RAM
  • Apollo Lake E3940 1.6GHz quad-core CPU with 4GB RAM
  • Apollo Lake N4200 1.1GHz (burstable to 2.5GHz) quad-core CPU with 8GB RAM

Zeta's small size and high feature density make it an ideal choice for mobile applications. It stands ready to meet the challenges of these environments with a wide range 6-36VDC input voltage, a -40 to +85°C operating temperature range, and fanless heat spreader cooling (heat sink options are available).


The use of interchangeable industry-standard CPU modules on Zeta offers two important system designer benefits: 

  • Performance scalability: One can design multiple applications based on a consistent hardware platform and select the CPU that best fits the price/performance/ power requirements of each one. In addition, as time goes on and your application needs more horsepower to support increased functionality, you can simply upgrade to a newer CPU with minimal to no redesign effort.
  • Long product life: The majority of today's x86 embedded processors offer limited lifecycles of 5-7 years, so any long-life product dependent on an x86 single-board computer (SBC) is likely to require redesign sometime during its lifecycle. Using industry-standard COMs lets you easily migrate to a new generation CPU module in the exact same form factor and containing the same feature set, with virtually no hardware or physical redesign efforts. Zeta is ideal for long-life applications such as Military, Medical, and Transportation.


Zeta provides a wide variety of onboard PC-type I/O, including: 

  • 2 Gigabit Ethernet ports
  • 4 RS-232/422/485 serial ports with programmable protocol selection port-by-port and programmable 120-ohm line termination for RS-422/485
  • 4 USB 2.0 ports + 1 USB 3.0 port
  • VGA and LVDS display outputs
  • 16-27 GPIO lines with 3.3V/5V logic level configurability
  • Wide range 6-36V input power supply

A PCIe mini card socket and an expansion connector (see below) provide the ability for further I/O expansion using industry-standard I/O modules.


Zeta is available in two baseboard configurations. Both configurations are available with any processor option. 

  • The “D” model provides 16 GPIO lines with 3.3V/5V logic compatibility and jumper-selectable pull-up/down resistors.
  • The “A” model features a comprehensive data acquisition circuit providing 16 SE / 8 DI analogue inputs with +/-10V, +/-5V, 0-10V, and 0-5V input ranges, 100KHz max sample rate with 2048-sample FIFO, 4 analogue outputs with 0-5V and 0-2.5V ranges, 27 GPIO instead of 16, 4 32-bit counter/timers, and 4 24-bit PWMs.

All digital and analogue I/O features are supported by Diamond’s industry-leading Universal Driver software, which provides a C language programming library that supports all features in an easy-to-use, high-level fashion. A graphical monitor and control program provides easy access to all the I/O features and lets you prototype your application quickly as well as debug problems. Universal Driver is available as a free download from the Diamond Systems website upon acceptance of their software license agreement. 


Zeta includes an expansion connector which supports the installation of a daughterboard with additional I/O. Diamond Systems will release one standard expansion board with the following features: 

  • Full/half-size MiniCard socket with PCIe x1 and USB2.0 connectivity
  • M.2 M-keying SSD connector for 2242 size M.2 SATA flash disk
  • HD Audio with Line In, Mic In, Line Out
  • 16 Digital IO lines with configurable 3.3V/ 5V logic levels and Pull-up/down resistors

Customers, of course, are free to design their own daughterboards.


CPU SpecIntel Bay Trail E3825 1.33GHz Dual Core CPU (6W TDP) with 2GB DDR3L RAM
Intel Apollo Lake E3940 1.6GHz quad core CPU (9W TDP) with 4GB DDR3L RAM
Intel Apollo Lake N4200 1.1GHz (burstable to 2.5GHz) quad Core CPU (6W TDP) with 8GB DDR3L RAM
ChipsetIntegrated in CPU
MemoryDepends on CPU - see CPU above
GraphicsVGA and LVDS
Network2 Gigabit Ethernet ports
Storage1 mSATA socket (shared with Mini PCIe)
1 Micro-SD socket
USB1x USB 3.0; 4 x USB 2.0
Serial4 RS-232/422/485 ports
AudioHDA audio on expansion connector
OtherWatchdog timer: Reset mode; Programmable interval 0-255 seconds


Expansion1 x PCIe MiniCard socket (shared with mSATA)

One expansion connector:
• MiniCard: 1 socket combining PCIe x1, mSATA, and USB 2.0 interfaces
• SATA: 1 port on the expansion connector
• PCIe: 2x PCIe x1 links on expansion connector
• USB: 1 USB 2.0 port on expansion connector
ElectricalPower Input: 6V to 36V input range
Power Consumption: tbd
Mechanical84 x 55mm / 3.3 x 2.2in
Conformal CoatingN/A
TemperatureTemperature range (operation): -40ºC to +85ºC (-40ºF to +185ºF)
Temperature range (storage): -40ºC to +85ºC (-40ºF to +185ºF)
Cooling method: Heat spreader standard, no fan
Humidity0-90% non-condensing
Weight1.30 oz baseboard
TBD COM module
TBD SBC complete
Warranty1 Year



BoardZETA-E3845-4GA Zeta SBC, E3845 CPU, 4GB RAM, with Data Acquisition
ZETA-E3845-4GD Zeta SBC, E3845 CPU, 4GB RAM, with Digital I/O
ZETA-E3940-4GA Zeta SBC, E3940 1.6GHz CPU, 4GB RAM Data acquisition circuit
ZETA-E3940-4GD Zeta SBC, E3940 1.6GHz CPU, 4GB RAM Digital I/O circuit
ZETA-N4200-8GA Zeta SBC, N4200 1.1GHz CPU, 8GB RAM Data acquisition circuit
ZETA-N4200-8GD Zeta SBC, N4200 1.1GHz CPU, 8GB RAM Digital I/O circuit
Development Kit, Zeta SBC with E3845 processor and DAQ, Cable kit, Linux 64-bit OS

Development Kit, Zeta SBC with E3825 processor and DAQ, Cable kit, Windows 10 64-bit OS

Development Kit, Zeta SBC with E3940 processor and DAQ, Cable kit, Linux OS

Development Kit, Zeta SBC with E3940 processor and DAQ, Cable kit, Windows 10 IoT Ent LTSB OS

Development Kit, Zeta SBC with N4200 processor and DAQ, Cable kit, Linux OS

Development Kit, Zeta SBC with N4200 processor and DAQ, Cable kit, Windows 10 IoT Ent LTSB OS

ZETA-DB-01 Zeta daughterboard with MiniCard and M.2 sockets, audio, and GPIO
ZETA-DB-02 Zeta daughterboard with MiniCard and M.2 sockets

CK-ZETA-01 Zeta SBC cable kit
Recab UK
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