OM-O2

OM-O2 / OM-O2P Onion Omega2 IoT modules Data Sheet Version 1.2 Omega2 Datasheet Table of Contents 1. Overview 1.1 Key Features 1.2 Variants 1.3 Differences from Omega2S Module 1.4 Block Diagram 4 6 7 7 8 2. Features 2.1 CPU 2.2 Memory 2.3 Flash 2.4 WiFi 2.4.1 Antenna 2.5 Interfaces 2.5.1 USB 2.5.2 SPI 2.5.3 I2C 2.5.4 I2S 2.5.4.1 Features 2.5.5 SDIO/eMMC 2.5.6 Ethernet 2.5.7 UART 2.5.7.1 Features 2.5.8 PWM 2.5.9 GPIO 9 9 9 9 9 9 9 9 10 10 10 10 10 10 11 11 11 11 3. Pin Definition 3.1 Pin Assignment 3.2 Special Pins 3.2.1 - System Boot Pins 3.2.2 - SPI Pins 3.2.3 - Reset Pins 3.2.4 - Power Supply Pins 12 12 14 14 15 15 16 4. Electrical Specifications 4.1 Absolute Maximum Ratings 4.2 Operating Conditions 4.3 Power Consumption 17 17 17 18 5. Mechanical Specifications 19 OM-O2 | OM-O2P Page 2 of 21 Omega2 Datasheet 5.1 Mechanical Drawing 5.2 Packaging Details 6. Additional Resources 6.1 Omega2 Online Documentation 6.2 More Resources 7. Datasheet Revision History OM-O2 | OM-O2P 19 19 20 20 20 21 Page 3 of 21 Omega2 Datasheet 1. Overview The Onion Omega2 is a Wi-Fi enabled, Linux-based development module, designed specifically for IoT applications. It provides a drop-in, low-power solution ideal for prototyping and building IoT hubs and devices. It features a MIPS 24KEc processor running at 580 MHz, built-in DDR2 DRAM, flash storage, and a 2.4 GHz 802.11b/g/n Wi-Fi radio. It supports a wide variety of I/O protocols, with dedicated pins for USB 2.0 and ethernet, and 18 pins available to the developer. The module is self-contained and only requires a power supply to operate. Measuring 42.9x26.4x9.9 mm, the Omega2 is a very small, self-contained, plug and play computing and connectivity device. It is a through-hole device, featuring 32 pins at a 2mm pitch. For prototyping and proof-of-concept work, it can be plugged into any of the Onion Omega2 Docks that provide ports, serial command line access, easy access to I/Os and more. At the next stage of development, custom hardware can be designed to accept the Omega2 depending on the end user’s specific needs. Onion also provides the Omega2S, a surface-mount version of the Omega2, designed specifically for high volume production. By virtue of the pre-loaded Linux operating system, developers can create their own applications using a programming language of their choice, and make use of existing network stacks and a rich set of software packages to implement their desired software functionality. Key highlights: ● ● ● ● ● ● ● Wi-Fi enabled Linux-based module for IoT applications Dual mode 2.4 GHz 802.11 b/g/n Wi-Fi - simultaneously host a WiFi access point and connect to existing WiFi networks On-board WiFi antenna & U.FL connector for optional external antenna CPU, memory, and flash storage are built-in Runs OpenWRT Linux operating system out of the box Features USB, ethernet, MicroSD, 2x UARTs, I2C, SPI, GPIOs interfaces FCC and CE certified OM-O2 | OM-O2P Page 4 of 21 Omega2 Datasheet Highlights on the software and operating system: ● ● The operating system is based on the OpenWRT Linux distribution ○ Support for modern programming languages: Python (2.7 and 3.6), NodeJS (8.10), GoLang, C, C++, and others The default device operating system image includes: ○ Onion’s enhanced WiFi driver ○ A package manager (opkg) ○ A lightweight web server (uhttpd) and an extendable Remote Procedure Call daemon (RPCD and ubus) ○ Utilities to control the GPIOs (gpioctl, fast-gpio) and pin multiplexing (omega2-ctrl) ○ The sysfs interface for programmatic control of the hardware interfaces ○ OnionOS, a web-based, graphical user interface for the Omega2 family The build system for creating an operating system image and software packages is open source, so developers can create their own customized operating system images tailored to their needs. It can be found on GitHub: https://github.com/OnionIoT/source. Additionally, the source code for many software packages created by Onion can be found on GitHub: https://github.com/OnionIoT This includes the Omega2 bootloader source code. Extensive documentation can be found online on the Onion Docs site that describes technical details, software usage, and more. OM-O2 | OM-O2P Page 5 of 21 Omega2 Datasheet 1.1 Key Features CPU Chipset MT7688AN Architecture MIPS24KEc Clock Speed 580MHz Memory Flash 16MB (OM-O2) or 32MB (OM-O2P) DDR2 DRAM 64MB (OM-O2) or 128MB (OM-O2P) WIFI WiFi Protocol IEEE 802.11 b/g/n Base Band 2.4GHz Data Rate 150 Mbit/s Channel Bandwidth 20/40 MHz Operation Mode AP, STA, AP&STA Encryption Mode WEP64/128, AES, WPA, WPA2, WAP On-board Antenna 2 dBi directional chip antenna Antenna Connector U.FL connector for optional external antenna Interfaces Ethernet 1 (10M/100M) USB 2.0 Host 1 SPI 1 I2C 1 I2S 1 UART 2 PWM 2 GPIO Up to 18 SD 1x MicroSD slot (OM-O2P only) OM-O2 | OM-O2P Page 6 of 21 Omega2 Datasheet Power Supply Requirement DC Input 3.3V No-load Running Current 200±40mA Peak Current Requirement 800mA Operation Conditions Ambient Temperature -10°C ~ 55 °C Storage Temperature -20°C ~ 80° C Operating Humidity 10%-95%RH (Non-Condensing) Storage Humidity 5%-95%RH (Non-Condensing) Physical Specifications Dimensions 42.9*26.4*9.9 mm Packaging Through-hole Pin Pitch 2mm Total Pins 32 Additional specifications and operating details for the microprocessor in the Omega2 can be found in the Mediatek MT7688 Datasheet 1.2 Variants Model Name RAM Flash Packaging OM-O2 Omega2 64 MB 16 MB Through-hole OM-O2P Omega2+ 128 MB 32 MB Through-hole 1.3 Differences from Omega2S Module The Onion Omega2S is the surface-mount packaged version of the Omega2, designed specifically for high volume production due to its low profile, extended feature-set, and production friendly design. The specific differences from the Omega2 are as follows: ● Surface-mount module form-factor ● Low profile, measuring 34x20x2.8 mm OM-O2 | OM-O2P Page 7 of 21 Omega2 Datasheet ● ● ● ● ● ● ● 63 total pins compared to 32 pins on Omega2 Pins for SD/eMMC are available on the pinout - no MicroSD slot Features 3 UARTs, compared to 2 on the Omega2 Features 4 PWM channels, compared to 2 on the Omega2 Exposes SPI Chip-Select 0 (CS0) pin No on-board antenna - features Antenna signal pin and U.FL connector No on-board system status LED - features system status pin for connection to external LED 1.4 Block Diagram OM-O2 | OM-O2P Page 8 of 21 Omega2 Datasheet 2. Features 2.1 CPU The processor is based on the MIPS architecture, it is a MIPS 24KEc, little-endian, 32-bit RISC core that operates at 580 MHz with a 64 KB Instruction Cache and 32 KB Data Cache. 2.2 Memory Features on-board 16-bit DDR2 DRAM memory operating at 400 MHz ● Omega2 features 64 MB memory ● Omega2+ features 128 MB memory 2.3 Flash Features on-board SPI flash storage that contains the bootloader, Linux OS, and WiFi calibration data. ● Omega2 features 24-bit addressed 16 MB flash storage ● Omega2+ features 32-bit addressed 32 MB flash storage 2.4 WiFi The Omega supports 2.4 GHz IEEE 802.11 b/g/n WiFi with a maximum 150 Mbps PHY data rate. The embedded RF front-end is 1T1R, meaning that it is used for both transmitting and receiving by virtue of time-multiplexing. The Omega’s WiFi interface can simultaneously host its own WiFi Access Point while connecting to another WiFi network. 2.4.1 Antenna The Omega2 features an on-board ceramic surface-mount chip antenna, it is a 2 dBi directional antenna. The Omega2 also features a male, surface-mounted U.FL connector for use with external antennas. To exclusively use an external antenna, the device must be modified by removing a 0Ω resistor. Find the full procedure outlined in this article. 2.5 Interfaces Describing the interfaces available on the Omega2 modules. 2.5.1 USB There is one (1) USB 2.0 host controller available on dedicated pins. OM-O2 | OM-O2P Page 9 of 21 Omega2 Datasheet Note 1: A 5V power source needs to be supplied to the USB client device to properly operate. Note 2: Special care needs to be taken to ensure the high-speed USB data lines are impedance matched when routing custom hardware for use with the Omega2. Note 3: Use of an ESD protection device is recommended. 2.5.2 SPI One (1) SPI interface is available. The interface supports half-duplex transmissions and can operate in host-mode only. The maximum SPI clock frequency is 40 MHz. The SPI interface features two Chip Select signals. The processor communicates with the on-board flash storage using the SPI protocol. The flash storage occupies SPI Chip Select 0, external devices can be connected to SPI Chip Select 1. Note: External devices connected to the SPI bus can affect the boot sequence under certain conditions. See section 3.3.2 - SPI Pins for details. 2.5.3 I2C There is one (1) I2C controller available. The interface can operate in host-mode only. Standard (100kbps) and fast mode (400kbps) are supported. The I2C logic level is 3.3V. 2.5.4 I2S The Omega2S has one (1) I2S interface available. The I2S interface consists of two separate cores, a transmitter and receiver. Both can operate in either master or slave mode. 2.5.4.1 Features - I2S transmitter / receiver, configurable as master or slave As slave: 24-bit data, sampling rates up to 192 kHz As master: 16-bit data, sampling rates of 8 kHz, 16 kHz, 22.05 kHz, 44.1 kHz, and 48 kHz Stereo audio data transfer 32-byte FIFO for transmission GDMA access 12 Mhz bit clock from external source (when in slave mode) 2.5.5 SDIO/eMMC The Omega2+ (OM-O2P) features a spring-loaded slot for MicroSD cards on the bottom of the device. The Omega2 supports the SDXC specification for SD cards, with a maximum capacity of 2 TB and a maximum transfer speed of 300 MB/s. 2.5.6 Ethernet The Omega2 has a single 10/100M Ethernet integrated PHY. It is recommended that typical ethernet magnetics be used, however for very short runs (