DATASHEET
Onion Omega2S Datasheet
Version 1.2
Omega2 IoT Computer
Onion Omega2S Datasheet
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Table of Contents
1. Description
2. Key features
3. Block diagram
3.1 Specifications
4. Pin-Out Information
4.1 Pin Layout Diagram
4.2 Pin Definitions
4.3 Pin-Out and Pin Muxing Diagram
4.4 Special Pins
4.4.1 - System Boot Pins
4.4.2 - SPI Pins
4.4.3 - Reset Pins
4.4.4 - Power Supply Pins
4.4.4.1 - VDD_Flash Pin
5. Recommended Reflow Profile
6. Mechanical Drawing and Specifications
7. Additional Resources
7.1 Omega2S Mechanical Drawings
7.2 Omega2S Reference Design Schematics
8. Datasheet Revision History
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Onion Omega2S Datasheet
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1. Description
The Omega2 is a highly integrated module designed by Onion Corporation. It utilizes the
Mediatek MT7688AN System on a Chip (SoC) device which is based on the MIPs 24K CPU
processor core. The SoC includes 802.11b/g/n Wi-Fi, making the Omega2 ideal for Internet
of Things (IoT) applications and projects. In addition to the SoC, the module includes DDR2
DRAM, Flash memory, and all of the components necessary to allow this product to be a
fully functional and complete device.
For high volume commercial applications, Onion has developed the Omega2S, a
surface-mount packaged version of the Omega2/Omega2+ through-holed devices. General
technical details and documentation for the Omega2 modules can be found on the Onion
website at
Omega2
and
Onion Docs.
The differences between the through-holed
Omega2/Omega2+ and the Omega2S/Omega2S+ are summarized as:
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Mechanical dimensions and footprint: The Omega2S is 20mm x 34mm, 2.8mm high
Greater quantity of I/O signals available to the user. The Omega2S has 42 I/O.
No SD Card slot on the bottom of the Omega2S.
No Wifi chip antenna in the Omega2S. An external antenna must be connected.
The Omega2S is available in two models, the Omega2S and Omega2S+. The differences
between the two models are in the amounts of memory and flash storage, they are otherwise
identical:
● Omega2S: 64MB Memory, 16MB Flash Storage
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Omega2S+: 128MB Memory, 32MB Flash Storage
Onion Omega2S Datasheet
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2. Key features
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Embedded MIPS24KEc (580 MHz) with 64 KB I-Cache and 32 KB D-Cache
1T1R 2.4 GHz with 150 Mbps PHY data rate
Legacy 802.11b/g and HT 802.11n modes
20/40 MHz channel bandwidth
Green AP/STA - Intelligent Clock Scaling (exclusive)
DDRII: ODT off, Self-refresh mode
1-port 10/100 FE PHY
x1 USB 2.0 Host
SPI/SD-XC/eMMC
SPI, I2C, I2S, PWM, PCIe, UART, GPIO
An optimized PMU
WEP64/128, AES, WPA, WPA2, WAPI
LEDE Linux Operating System
Available in two models, with the only difference being the storage and memory
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Omega2S: 64MB Memory, 16MB Flash Storage
Omega2S+: 128MB Memory, 32MB Flash Storage
Additional specifications and operating details for the microprocessor in the Omega2S can
be found in the Mediatek datasheet, which can be downloaded from the following site:
Mediatek MT7688 Datasheet
Onion Omega2S Datasheet
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3. Block diagram
Onion Omega2S Datasheet
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