Embedded Open Modular Architecture/EOMA-200

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  1. EOMA-200
  • Dimensions: 100mm x 65mm PCB in a 103 x 68 x 16mm case
  • Pinouts: 4 50-pin B2B connectors providing 200 mandatory pins
  • Extensibility: 30mm x 14mm front-facing panel space and 2nd 65mm x 14mm front-facing panel
  • Power provision: 5V @ 3.5A and 3.3V @ 3.5A (29 Watts total)
  • Target uses: Small Desktop systems, Micro servers, Smart NAS Home Servers, Digital Signage, Industrial PCs, Education and R&D purposes.
  1. Introduction

With many standards providing 200 or more pins, the differentiator which makes EOMA-200 worthwhile is that all other standards are bare PCB factory-only modules with optional sizes and optional functions. These factors combine to make other standards realistically installable only by experts or technical engineers with knowledge of ESD precautions and the full details of the available options.

The EOMA-200 modular standard is designed to be user-installable in mass-volume appliances. **There are no options on the pinouts**. Instead, options for extensibility are offered via two front-facing panels. One is of size 30mm x 14mm, and the other is of size 65mm x 14mm. The 65mm panel is sufficient to fit up to 4 Ethernet ports, or up to 8 USB2/3 ports, an HDMI connector, eSATA etc. The 30mm panel is intended but not limited to having an on-board MiniPCIe slot behind it, such that WIFI SMA connectors can be put into the 30mm panel.

  1. Preliminary pinouts
HDMI: 19
USB3 1: 8
USB3 2: 8
USB3 3: 8
USB-OTG 4: 5
SATA: 4
I2C 0: 2
I2C 1: 2
I2S: 8
SPI: 5
5V : 7
3.3V : 7
GND: 19
RGB/TTL: 28
SDMMC 1: 12
PCIe4x: 20
Gig Eth: 8
GPIO: 24
UART 1: 2
UART 2: 4
-----
Total: 200

Connector 1

1-19: HDMI
20: GND
21-28: Gig Eth
29: GND
30-37: I2S
38-39: I2C 1
40-41: 2 5V
42: GND
43: 1 3.3V
44: GND
45-50: 6 GPIO

Connector 2

1-24: PCIe4x + 4 GND
25-26: I2C 0
27-38: SDMMC
39-40: UART 1
41: GND
42-43: 2 3.3V
44: GND
45-50: 6 GPIO (GPIO0, GPIO1, PRSNT1, WAKE, PWRGD, PRSNT2)

Connector 3

1-28: RGB/TTL
29: GND
30-33: SATA
34: GND
35-38: UART 2
39-40: 2 5V
41: GND
42-43: 2 3.3V
44: GND
45-50: 6 GPIO


Connector 4
1-9: 1 USB3 + 1 GND
10-18: 2 USB3 + 1 GND
19-27: 3 USB3 + 1 GND
28-32: 4 USB-OTG
33-37: SPI
38: GND
39-41: 3 5V
42: GND
45-50: 6 GPIO