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3.5" Form Factor
COM Express
ARM SBCs and Baseboards
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Zeta Miniature COM-Based SBC

Ultra-Small Solution with Integrated DAQ
using COM Express Mini Type 10 CPU Modules
Ultra-Small Solution with Integrated DAQ
using COM Express Mini Type 10 CPU Modules

Zeta Miniature COM-Based SBC
Complete Zeta SBC
Zeta Miniature COM-Based SBC
Zeta Carrier Board top, with data acquisition
Ideal solution for airborne and other vehicle applications
Interchangeable industry standard COMs support long product lifecycles
2x Gigabit Ethernet ports
4x RS-232/422/485 serial ports
4x USB 2.0 ports + 1x USB 3.0 port
VGA and single-channel LVDS display
PCIe MiniCard / mSATA socket
Micro SD socket
16 single-ended / 8 differential analog inputs
16-bit A/D resolution
100KHz max A/D sample rate
4 16-bit analog outputs
27 digital I/O configurable as counter/timers and PWM
Expansion connector with PCIe, SATA and audio interfaces
6-36VDC input range
COM Express Mini form factor: 3.3 x 2.2 in / 84 x 55mm
-40°C to +85°C (-40°F to +185°F). For the N4200 module, the temperature range is 0°C to 60°C operating temperature.
Bottom-mounted heat spreader cooling


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 four 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).

Benefits of COM-based SBCs
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.



Block Diagram

Conduction Cooling

The bottom side heat spreader on Zeta provides the most efficient cooling solution in a size-optimized design, enabling Zeta to run reliably at up to 85ºC. The heat spreader conducts heat directly to the system chassis for maximum heat dissipation to the ambient environment and minimum radiation into the enclosure interior. By reducing the interior temperature, Zeta helps to improve overall system reliability. In addition the bottom side heat spreader leaves the entire top side of the board free for expansion and simplifies system configuration and maintenance.

Available Models

Zeta is available with four different processor options. Each CPU may be paired with both the digital I/O and full analog/digital I/O baseboard.

ModelProcessor /Speed / Memory
ZETA-E3825-2GAE3825 1.33GHz CPU, 2GB RAMData acquisition circuit
ZETA-E3825-2GDE3825 1.33GHz CPU, 2GB RAMDigital I/O circuit
ZETA-E3845-2GAE3845 1.91GHz CPU, 2GB RAM Data acquisition circuit
ZETA-E3845-2GDE3845 1.91GHz CPU, 2GB RAMDigital I/O circuit
ZETA-E3940-4GAE3940 1.6GHz CPU, 4GB RAMData acquisition circuit
ZETA-E3940-4GDE3940 1.6GHz CPU, 4GB RAMDigital I/O circuit
ZETA-N4200-8GAN4200 1.1GHz CPU, 8GB RAMData acquisition circuit
ZETA-N4200-8GDN4200 1.1GHz CPU, 8GB RAMDigital I/O circuit

Development Support

Operating system support is available for Linux (Ubuntu 16.04 LTS), Windows Embedded 7, and Windows 10 IoT Enterprise LTSB. Drivers and instructions are available for free download on the Diamond website. Software development kits / board support packages are available as well and consist of the selected operating system installed and pre-configured on a solid state flashdisk (SSD).

Model Linux Windows
ZETA-E3825-2GA / 2GD Ubuntu 16.04 LTS 32-bit Windows Embedded 7 32-bit
ZETA-E3845-2GA /2GD Ubuntu 16.04 LTS 32-bit Windows 10 IoT Enterprise LTSB 64-bit
ZETA-E3940-4GA / 4GD Ubuntu 16.04 LTS 64-bit Windows 10 IoT Enterprise LTSB 64-bit
ZETA-N4200-8GA / 8GD Ubuntu 16.04 LTS 64-bit Windows 10 IoT Enterprise LTSB 64-bit

Development Kits

Zeta is available in a complete development kit that includes a full set of I/O cables and the selected SDK. Simply install the pre-configured flashdisk, attach cables / keyboard / mouse / monitor, power up, and the system is ready to run.

CK-ZETA-01: Cable kit for Zeta Miniature COM-Based SBC

he Zeta cable kit includes cables for all I/O features on Zeta except LCD. Details are provided below. Individual cables are available as a special order item; minimum order quantities and leadtimes may apply.

An LCD / backlight cable kit is available for specific displays used in our manufacturing environment. Customers may purchase this cable kit as a starting point and modify the LCD ends to support their specific display.

Zeta Miniature COM-Based SBC Cable Kit

CK-ZETA-01 includes the following cables:

No. Qty Cable Description Drawing
1 2 6981082 Dual USB 2.0 type A Show
2 2 6981075 Dual serial port DB9M Show
3 1 6980524 Cable Battery Hdr 1.25mm Show
4 2 6981080 Gigabit Ethernet cable Show
5-6 2 6980516 Analog I/O and Digital I/O cables -
7 1 6981084 VGA Show
8 1 6980100 Dual USB 2.0/3.0 type A -
9 1 6981070 Power input cable Show

I/O Features

Zeta (top) "A" Model baseboard layout and baseboard bottom (below).

Zeta provides a wide variety of on-board 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 minicard socket and an expansion connector (see below) provide the ability for further I/O expansion using industry standard I/O modules.

Data Acquisition

Data Acquisition Circuit

Zeta baseboard with integrated analog and digital data acquisition circuit

Zeta is available with two different data acquisition circuits, denoted by either A or D in the model number. Both circuits are available with any processor option.

All digital and analog 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. Demo programs with source code and executables are included to demonstrate the use of each library function. 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 our website upon acceptance of our software license agreement.

"A" Model Full Data Acquisition

Zeta "A" models include a complete data acquisition circuit with a combination of analog and digital I/O features. The circuit controller is an FPGA that interfaces to the host CPU via the LPC bus.

A/D Features

  • 16 analog voltage inputs
  • 16-bit resolution (1 part in 65536)
  • Programmable input ranges: 0-5V, 0-10V, +/-5v, +/-10V
  • Single-ended and differential input configuration options
  • Precision, low-drift 2.5V reference voltage
  • 100KHz maximum total A/D sample rate (all active channels combined)
  • Integrated 2048-sample FIFO and interrupt service for efficient high-speed sampling

D/A Features

  • 4 analog voltage outputs
  • 16-bit resolution (1 part in 65536)
  • Single-channel and multi-channel simultaneous update modes
  • Programmable output range: 0-5V, 0-2.5V
  • 30KHz update rate capability
  • Waveform generator on 1 to 4 outputs with user-defined waveforms and 2048-sample waveform buffer

Digital I/O features

  • 27 digital I/O lines
  • User-selectable 3.3V / 5V logic levels
  • User-selectable 10K pull-up / pull-down resistors
  • Programmable direction in 8-bit and 1-bit groups
  • 8-bit programmable edge detection circuit
  • Buffers for protection and higher current drive
  • 8 32-bit counter/timers with up counting, down counting, pulse output, and interrupt features
  • 4 24-bit pulse-width modulators with programmable duty cycle and output polarity
  • Interrupt support on ISA bus for A/D, digital I/O, and counter/timer circuits

"D" Model Digital I/O

Zeta "D" models include a digital I/O (GPIO) circuit based on the popular PCA9535 GPIO expander chip with the following features:

  • 16 digital I/O lines
  • User-selectable 3.3V / 5V logic levels
  • User-selectable 10K pull-up / pull-down resistors
  • Programmable direction in 8-bit groups
  • Buffers for protection and higher current drive

Mass Storage and Expansion

Mass Storage Options

Systems which do not require any additional I/O beyond the baseboard features may use the baseboard’s MiniCard/mSATA socket to contain the system bootable mass storage. For Linux operation, the Micro SD socket may also be used for bootable mass storage, leaving the MiniCard socket available for expansion. A system running Windows which requires additional I/O must use the optional daughterboard. In this case the designer has the choice of either the baseboard mSATA socket or the daughterboard’s M.2 socket for the bootable mass storage. If the M.2 socket is used, then both the baseboard and the daughterboard minicard sockets are available for I/O module installation.

Zeta Daughterboard

Zeta includes an expansion connector which supports the installation of a daughterboard with additional I/O and expansion 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 flashdisk
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

Zeta daughterboard expansion connector
ZETA-DB-01 full-feature daughterboard with expansion sockets, audio and GPIO
ZETA-DB-02 low-cost daughterboard with minicard and M.2 sockets only
Zeta SBC with full-feature daughterboard and modules installed

Block Diagram


Core CPU Features
Processor/memory options Intel Bay Trail E3825 1.33GHz Dual 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
System I/O Interfaces
Serial Ports 4 RS-232/422/485 ports
USB 1x USB 3.0; 4 x USB 2.0
Networking 2 Gigabit Ethernet ports
Keyboard/Mouse USB keyboard/mouse
Display VGA and LVDS
Audio HDA audio on expansion connector
Watchdog timer Reset mode; Programmable interval 0-255 seconds
Mass Storage 1 Mini PCIe /mSATA socket; 1 Micro-SD socket
Data Acquisition Features
Analog Inputs 16 Single-Ended / 8 Differential voltage inputs
Input ranges +/-10V, +/-5V, 0-10V, 0-5V
Maximum Sample Rate 100,000 samples/sec aggregate
On-board FIFO 2048 samples, programmable threshold
DAQ Calibration No calibration required
Analog Outputs 4 16-bit voltage outputs
Output ranges 0-5V, 0-2.5V programmable
A Model Digital I/O 27 lines independently programmable
D Model Digital I/O 16 lines independently programmable for input/output
PWM 4 24-bit pulse width modulators
Counter / timers 8 32-bit counter/timers
Logic signal voltage levels 3.3V/5V logic levels jumper-selectable
Expansion Buses
MiniCard 1 socket combining PCIe x1, mSATA, and USB 2.0 interfaces
SATA 1 port on expansion connector
PCIe 2x PCIe x1 links on expansion connector
USB 1 USB 2.0 port on expansion connector
Physical and Mechanical
Power input 6V to 36V option
Cooling Heat spreader standard, no fan
Power Consumption TBD
Operating Temperature -40ºC to +85ºC (-40ºF to +185ºF)
Form Factor COM Express Mini Type 10
Dimensions 84 x 55mm / 3.3 x 2.2in
Weight 1.30 oz baseboard; TBD COM module; TBD SBC complete
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