1. Product Overview

Product Name: M-502T
Model: M-502T
Series: ARM9 Embedded Linux System-on-Module (SoM)
Article Number: M-502T
Manufacturer: Artila Electronics Co., Ltd.

The Artila M-502T is a compact, credit-card-sized industrial-grade System-on-Module (SoM) built around the Atmel AT91SAM9G20 ARM926EJ-S processor running at 400 MHz. Designed for embedded and industrial applications, it integrates a full Linux 2.6.29 operating system, networking interfaces, multiple serial ports, USB connectivity, and extensive digital I/O capabilities. The module is engineered for fanless operation, wide temperature tolerance, and long-term reliability in automation, control, and communication systems.

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2. Key Features

- High-Performance ARM9 Processor:
Powered by the Atmel AT91SAM9G20 SoC featuring a 400 MHz ARM926EJ-S core with integrated Memory Management Unit (MMU), 32 KB instruction cache, and 32 KB data cache.

- Pre-Installed Embedded Linux:
Ships with Linux kernel 2.6.29, U-Boot bootloader, and a suite of preconfigured utilities including BusyBox, lighttpd web server, SSH, FTP, and package management via ipkg.

- Comprehensive Connectivity:
Includes one 10/100 Mbps Ethernet port (DAVICOM DM9161 PHY with 1.5 kV isolation), four UARTs (RS-232/422/485 selectable), two USB 2.0 host ports, one USB 2.0 device port, and an SD memory card interface.

- Extensive I/O Options:
32 programmable 3.3 V general-purpose digital I/O lines, configurable as input or output, with interrupt support.

- Integrated Real-Time Clock (RTC):
ST M41T81 RTC with 48 mAh lithium backup battery ensures timekeeping during power loss.

- Compact and Robust Design:
Measures only 80 mm × 50 mm, consumes approximately 2 W, and operates reliably in extended temperature ranges from −20 °C to +80 °C.

- Software Development Ready:
Includes GNU C/C++ cross-compilation toolchain for Linux and Windows, POSIX-compliant GLIBC libraries, and SDK with example programs.

- Industrial-Grade Reliability:
Fanless, flash-based architecture with watchdog timers, hardware flow control, and secure communication protocols (SSL, SSH 1.0/2.0).

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3. Technical Specifications

Processor and Memory
- CPU: Atmel AT91SAM9G20 ARM926EJ-S (400 MHz)
- Architecture: ARM9 with MMU, 32 KB I-cache, 32 KB D-cache
- SDRAM: 64 MB
- NAND Flash: 128 MB
- DataFlash: 2 MB (system backup and boot image)

Networking
- Ethernet: 10/100 Mbps (DAVICOM DM9161 PHY)
- Isolation: 1.5 kV magnetic isolation
- Connector signals: ETX0+, ETX0−, ERX0+, ERX0−

Serial Communication (UART)
- Ports: 4 (COM1–COM4)
- Modes: RS-232/422/485 software-selectable
- Baud Rate: Up to 921.6 kbps
- Data Bits: 5–9 bits
- Parity: None, Even, Odd, Mark, Space
- Stop Bits: 1, 1.5, 2
- Flow Control: RTS/CTS, XON/XOFF, None
- Signal Level: CMOS/3.3 V compatible
- RS-485: Supports 9-bit multi-drop and hardware auto-direction control

USB Interfaces
- Host Ports: 2 × USB 2.0 full-speed (12 Mbps)
- Device Port: 1 × USB 2.0 full-speed client
- Host Signals: UDataA+/−, UDataB+/−
- Device Signals: DDP, DDM, UDIO

Digital I/O (GPIO)
- 32 programmable GPIOs (NXP PCA9539 controller)
- Voltage: 3.3 V CMOS/TTL compatible
- Input thresholds: Low ≤ 0.9 V, High ≥ 2.3 V
- Output drive: 8 mA at 0.5 V (low) or 1.8 V (high)
- Interrupt capability on input configuration

Peripheral Interfaces
- I²C Bus: TWD, TWCK (standard two-wire interface)
- SPI Bus: MISO, MOSI, SPCK, CS1, CS2
- I²S Bus: TSCK, TWS, TSD (TX); RSCK, RWS, RSD (RX)
- SD/MMC Interface: MCCDA, MCCK, MCDA0–MCDA3 (SD Spec 1.0 compliant)
- Local Bus: 8-bit data (D0–D7), 8-bit address (A0–A7), 3 chip selects (NCS0, NCS5, NCS6)

Real-Time Clock
- Chip: ST M41T81
- Backup Battery: 3 V lithium (48 mAh)

Power
- Input Voltage: 3.0–3.6 V DC (nominal 3.3 V)
- Power Consumption: 2–2.5 W

Physical Characteristics
- Dimensions: 80 mm × 50 mm
- Connectors: CN1 (28 pins), CN2 (50 pins), CN3 (50 pins), 2.0 mm pitch
- Mounting: 4 × M2 holes (2 mm diameter)

Environmental
- Operating Temperature: −20 °C to +80 °C
- Cooling: Fanless operation

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4. Functionality

The M-502T operates as a self-contained embedded computing module capable of running Linux-based applications directly from onboard flash memory. It functions as the core processing unit in industrial controllers, automation systems, and networked devices.

Typical Use Cases:
- Industrial automation controllers and gateways
- Intelligent transportation systems (ITS)
- Building automation and energy management
- Remote monitoring and data acquisition (SCADA)
- Embedded web servers and IoT edge devices

Operation:
The module boots from onboard NAND Flash using U-Boot, loads the Linux kernel, and mounts the root filesystem (UBI/JFFS2/EXT2/EXT3). It provides network connectivity via Ethernet and supports serial communication through its four UARTs. USB host ports allow connection of peripherals such as flash drives, Wi-Fi adapters, or serial converters. GPIOs can be programmed for digital control or monitoring tasks.

Compatibility:
- Supports Linux 2.6.x kernel and WinCE (optional)
- Compatible with standard USB 2.0 devices and SD memory cards
- Works with Artila’s evaluation kits and expansion boards

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5. Components & Accessories

Included Components:
- M-502T System-on-Module
- Pre-installed Linux 2.6.29 OS and utilities
- U-Boot bootloader
- RTC with lithium backup battery
- Predefined I/O (Reset, Buzzer, LEDs, DIP switch)

Optional Accessories:
- Evaluation board for rapid prototyping
- JTAG debug cable
- Power adapter (3.3 V DC regulated supply)
- USB and serial cables
- SD memory card for data storage
- Software Development Kit (SDK) CD with cross-compilation tools

Connectors:
- CN1: 28-pin (local bus, data/address lines)
- CN2: 50-pin (UARTs, GPIOs, control signals)
- CN3: 50-pin (Ethernet, SPI, SD, I²C, GPIOs)
- JP4: Serial console (RS-232 TX/RX)
- CON1: JTAG interface

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6. Installation & Setup

Power Requirements:
Supply a regulated 3.3 V DC input (3.0–3.6 V range). Typical consumption is 2 W.

Mounting Options:
The module can be mounted on a carrier board via 2.0 mm pitch headers or installed in a DIN-rail case for industrial environments. Four M2 mounting holes ensure mechanical stability.

Configuration:
- Boot mode selection via jumper (internal ROM or external Flash)
- Default network configuration:
- IP Address: 192.168.2.127
- Netmask: 255.255.255.0
- SSH login: root/root
- Telnet login: guest/guest
- Web server accessible via lighttpd at default IP
- System administration through SSH, Telnet, or Webmin (installable via ipkg)

Software Setup:
Developers can cross-compile applications using the provided GNU toolchain. The module supports package management with ipkg for installing or updating software.

Peripheral Setup:
- USB devices auto-detected (e.g., flash drives, Wi-Fi dongles)
- SD card mounted via `/mnt/mmc`
- Serial ports accessible as `/dev/ttyS1`–`/dev/ttyS4`
- GPIOs controlled via standard Linux sysfs interface

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7. Performance & Capabilities

Processing Performance:
The 400 MHz ARM926EJ-S core provides sufficient computational power for multitasking embedded applications, web serving, and real-time control.

Memory and Storage:
64 MB SDRAM supports multitasking under Linux, while 128 MB NAND Flash and 2 MB DataFlash provide ample space for OS, applications, and data storage.

Networking:
10/100 Mbps Ethernet ensures reliable LAN connectivity with hardware isolation for industrial safety.

Serial Communication:
Four high-speed UARTs (up to 921.6 kbps) support multiple serial protocols and devices simultaneously.

USB Performance:
Two USB 2.0 full-speed host ports (12 Mbps) allow peripheral expansion, while the device port enables PC connectivity for firmware updates or data exchange.

I/O Responsiveness:
32 GPIO lines with interrupt capability enable responsive control and monitoring in automation systems.

Power Efficiency:
Low power consumption (2 W typical) allows deployment in energy-sensitive environments.

Limitations:
- Limited to 400 MHz CPU frequency (not suitable for heavy multimedia processing)
- USB limited to full-speed (12 Mbps, not high-speed 480 Mbps)
- Memory capacity (64 MB SDRAM) may constrain large applications

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8. Standards & Compliance

Hardware Standards:
- ARM926EJ-S architecture compliant with ARMv5TEJ
- Ethernet IEEE 802.3 10/100 Base-TX
- USB 2.0 full-speed compliance
- SD memory card specification 1.0
- SPI, I²C, and I²S standard interfaces

Software Standards:
- Linux kernel 2.6.29 (POSIX-compliant)
- File systems: UBI, JFFS2, EXT2/EXT3, VFAT/FAT, NFS
- Network protocols: IPv4, ICMP, ARP, DHCP, NTP, TCP, UDP, FTP, Telnet, HTTP, PPP, PPPoE, SNMP v1/v3, SSL, SSH 1/2

Regulatory and Safety Compliance:
- 1.5 kV Ethernet isolation for industrial safety
- RoHS-compliant manufacturing
- Designed for extended temperature operation (−20 °C to +80 °C)

Certifications:
- CE and FCC (typical for Artila industrial modules)
- EMC compliance for industrial environments

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9. Additional Information

Warranty:
Standard manufacturer warranty (typically 1 year) covering defects in materials and workmanship.

Technical Support:
Artila provides email-based technical support (sales@artila.com) and online documentation, including hardware schematics, software guides, and SDK resources.

Maintenance:
- Flash-based storage eliminates moving parts, reducing maintenance.
- RTC battery replacement recommended every 3–5 years.
- Firmware and software updates available via Artila’s website.

Software Updates:
Users can update the Linux kernel, bootloader, or application packages using ipkg or manual flashing via USB or network.

Developer Resources:
- SDK CD with cross-compilation tools and example source code
- Manager Utility (manager.jar) for network discovery and configuration
- Webmin for browser-based system management

Longevity and Availability:
The M-502T is designed for long-term availability and stable supply, suitable for OEM integration and industrial deployment.

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Summary

The Artila M-502T is a robust, Linux-ready ARM9 System-on-Module engineered for embedded and industrial applications requiring compact size, low power consumption, and versatile connectivity. With its 400 MHz ARM926EJ-S processor, 64 MB SDRAM, 128 MB NAND Flash, and comprehensive I/O suite—including Ethernet, USB, UART, SPI, I²C, I²S, and 32 GPIOs—the M-502T provides a complete computing platform for automation, control, and communication systems. Its pre-installed Linux environment, extensive driver support, and cross-platform development tools make it an ideal choice for developers seeking rapid deployment and long-term reliability in industrial embedded solutions.