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Sandwich-style ARM9 SBC ships with Linux

Aug 13, 2014 — by Eric Brown 2,508 views

MYIR announced a sandwich-style single board computer that runs Linux on a Freescale i.MX28x SoC and features -40 to 85°C operation and a CAN bus interface.

MYIR specializes in low-power ARM single board computers (SBCs) and computer-on-modules (COMs), with the latter including the MYC-SAM9X5-V2 (using Atmel’s ARM9-based AT91SAM9X5) and MYC-AM335X (using TI’s Cortex-A8 based Sitara AM335x). With the new MYC-IMX28X COM and associated MYD-IMX28X development board, the company is mining the Freescale i.MX28x, a 454MHz, ARM9 system-on-chip that has been used in many embedded Linux boards, most recently including Technologic’s TS-7400-V2.

MYD-IMX28X development board with MYC-IMX28X COM installed

The MYD-IMX28X plus MYC-IMX28X combination is suitable for use in applications such as smart gateways, human-machine interfaces (HMIs), handheld devices, scanners, portable medical, education, and other industrial applications, says MYIR. The optional industrial temperature support means the boards can operate in a variety of extreme conditions. Although the 140 x 90mm MYD-IMX28X dev board normally comes with the MYC-IMX28X COM preinstalled, the COM can be ordered separately.

MYD-IMX28X COM top (left) and bottom

The 62 x 38mm MYD-IMX28X COM offers a choice of Freescale i.MX283 or i.MX287 SoCs, but you can also request a more stripped-down i.MX280 or i.MX286. The different models result in some slight differences in interfaces. Most notably in the case of the two default choices, only one 10/100 Ethernet port instead of two and no CAN support on the i.MX283 (see the charts below).

MYC-IMX28X COM block diagram
(click images to enlarge)

The MYC-IMX28X COM is further equipped with 128MB DDR2 SDRAM and 256MB NAND flash with pre-installed Linux 2.6.35. The 80-pin expansion interface, split into two 40-pin connectors, offers a pair of USB ports, four serial ports, SDIO, and a variety of industrial interfaces.

Interface variations depending on i.MX28x SoC model
(click image to enlarge)

The MYD-IMX28X COM plugs into the top side of the MYD-IMX28X baseboard via a pair of 40-pin board-to-board connectors. The baseboard board adds an SD slot, one or two 10/100 Ethernet ports, depending on the SoC model, and an LCD interface with a 4-wire resistive touchscreen interface. You can choose between 4.3- and 7-inch touchscreen options. The extensive audio I/O includes digital audio out and variety of analog I/O jacks.

A USB 2.0 host port and mini-USB 2.0 OTG port are joined by two coastline RS-232 ports and an internal RS-485 serial interface. The i.MX287 version gives you two CAN ports while the i.MX283 model gives you one. A JTAG interface and a variety of onboard serial industrial I/O are also available, and can be expressed via a pair of 20-pin expansion connectors.

MYD-IMX28X detail view
(click image to enlarge)

Summary of MYC-IMX28X COM specs


Specifications listed for the MYC-IMX28X COM include:

  • Processor – Freescale MX283 or i.MX287 (1x ARM926EJ-S core @ 454MHz); i.MX280 or i.MX286 available upon request
  • Memory:
    • 128MB DDR2 SDRAM
    • 256MB NAND flash
    • 128KB SPI data flash
  • Networking — 10/100 Ethernet PHY onboard
  • Other I/O (via 1.27mm pitch 2 x 40-pin SMT male connectors):
    • Ethernet (2x for i.MX287, 1x for i.MX283)
    • 2x USB 2.0 OTG ports
    • Up to 4x serial ports
    • I2C
    • 2x SPI
    • Up to 8x ADC (1x high-speed ADC, 7x low-resolution ADC)
    • Up to 5x PWM
    • SDIO
  • Other features — 2x LEDs
  • Operating temperature — -20 to 70°C or -40 to +85°C
  • Dimensions — 62 x 38mm (6-layer PCB)
  • Operating system — Linux 2.6.35 preloaded, with U-Boot, drivers, file system, etc.

MYD-IMX28X development board (left) and its block diagram
(click images to enlarge)

Summary of MYD-IMX28X baseboard specs

Specifications listed for the MYD-IMX28X development board include:

  • Processor and memory — via MYC-IMX28X COM
  • Storage — TF (SD) slot
  • Networking — 10/100 Ethernet port (2x ports with i.MX287)
  • A/V I/O:
    • LCD interface (16-bit true color)
    • 4-wire resistive touchscreen interface
    • Optional 4.3- or 7-inch TFT LCD touchscreens
    • Digital audio out jack
    • Audio input jack
    • Audio output jack
    • Headphone output jack
    • Mic input interface
  • Other I/O:
    • USB 2.0 host port
    • Mini-USB 2.0 OTG port
    • 3-wire RS-232 debug (DB9)
    • 5-wire RS-232 (UART0)
    • RS-485
    • 2x CAN interfaces (i.MX287 only)
    • 3x ADC (one high-speed ADC, two low-resolution ADC)
    • SPI
    • 2x I2C
    • 3x UART
    • 3x PWM
    • JTAG interface (2.54mm pitch, 20-pin)
    • 2x 20-pin expansion connectors (2.0mm)
  • Other features — Buzzer; 4x buttons (3x user) ; 2x LEDs
  • Power — +5V
  • Operating temperature — -20 to 70°C or -40 to +85°C
  • Dimensions — 140 x 90mm (4-layer PCB)

Further information

The MYD-IMX28X development board with COM preinstalled appears to be available now, at single-unit prices of $99 (commercial temperature) or $119 (industrial). By itself, the MYC-IMX28X COM goes for $39 (commercial) or $59 (industrial) for the MYC-IMX28X COM in single pieces. Volume discounts are also available. The touchscreens go for $60 (4.3-inch) or $99 (7-inch). Much more information may be found at MYIR’s MYD-IMX28X development board and MYC-IMX28X COM product pages.

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