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Tiny Linux-based AM335x COMs can freeze or fry

Nov 1, 2014 — by Eric Brown — 1,845 views
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MYIR unveiled two Linux-ready COMs based on the TI Sitara AM335x SoC, each offering -40 to 85°C operation and supported by their own carrier boards.

Like the MYC-AM335X computer-on-module announced back in January, the MCC-AM335X-Y and MCC-AM335X-J COMs are equipped with the Texas Instruments Sitara AM335x system-on-chip, built around a Cortex-A8 core. The new models are smaller than the original, and each offers a different expansion interface, resulting in slightly different I/O for all three COMs. Even the available carrier boards for the three COMs are each different.



MCC-AM335X-Y and MCC-AM335X-J
(click images to enlarge)

The new MCC-AM335X-Y and MCC-AM335X-J COM models add 128MB and 256MB options for DDR3 RAM and NAND flash, rather than providing only 512MB for both. They are both limited to Linux 3.2 support, rather than offering the original model’s Android and Windows CE options. They also add a power management IC (PMIC), and move from a 3.3V to a 5V power supply. As before, the modules are available in both commercial and industrial temperature versions.


MYC-AM335X

Like the company’s earlier MYC-AM335X COM, low-volume purchases are available only with two of the six Sitara models, but whereas the MYC-AM335X offered the Sitara AM3352 and AM3359, the new COMs default to the AM3352 and AM3358. Other models are available for high-volume customers, says MYIR.

Like the Sitara AM3359, the AM3358 provides a PowerVR SGX 530 3D graphics processor and dual PRU-ICSS programmable subsystems. However, it lacks the AM3359’s EtherCAT slave support. On the other hand, it clocks up to 1GHz instead of topping out at 800MHz. The low-end AM3352 lacks the GPU and the PRU-ICSS, but can also be clocked at up to 1GHz.

 
MCC-AM335X-Y COM and carrier board

The MCC-AM335X-Y is the smallest of the three modules, at 65 x 35mm, but it has the most PCB layers, with 10. Unlike the original MYC-AM335X, which offers a pair of 60-pin expansion connectors, the MCC-AM335X-Y relies on a 146-pin stamp hole interface. The COM provides one less SDIO and one more ADC interface than the original.



MCC-AM335X-Y detail view
(click image to enlarge)

Specifications listed for the MCC-AM335X-Y module include:

  • Processor — TI AM3352 or AM3358 (1x Cortex-A8 @ up to 1GHz); PowerVR SGX 530 3D and 2x PRU-ICSS (AM3358 only on both); other AM335x models available in volume
  • Memory –128MB, 256MB, or 512MB DDR3 SDRAM; 128MB, 256MB, or 512MB NAND flash
  • Networking — gigabit Ethernet PHY supporting 2x ports
  • Other I/O (via 146-pin stamp hole interface):
    • 2x USB 2.0 OTG
    • Up to 6x serial
    • 2x I2C
    • SPI
    • 8x ADC
    • 2x PWM
    • 2x SDIO
  • Other features – Watchdog; 1x user LED
  • Power — +5V/0.8A supply; PMIC (TPS65217C)
  • Operating temperature — 0 to 70°C standard; -40 to 85°C available on request
  • Dimensions — 65 x 35mm; 10-layer PCB
  • Operating system — Linux 3.2.0

The MYD-AM335X-Y Development Board measures 118 x 90mm and features a 5V power supply. The carrier board offers real-world ports including dual gigabit Ethernet ports, USB 2.0 host and Mini-USB OTG ports, a serial debug port, a TF (SD) slot, and audio I/O. A WiFi module is available on the back.



MYD-AM335X-Y Development Board
(click image to enlarge)

Additional onboard interfaces include an LCD interface with 4-wire resistive touch, supported by an optional 4.3-inch touchscreen. The carrier board provides an RS485 interface, and despite the lack of CAN support listed for the Y module, it features an isolated CAN port. Other interfaces are passed along via a pair of 20-pin connectors. The board also provides a number of user buttons and a buzzer.

 
MCC-AM335X-J COM and carrier board

The MCC-AM335X-J is the most feature-rich of the three modules, thanks to its 200-pin SODIMM connector. It’s smaller than the original, but slightly larger than the MCC-AM335X-Y, at 67.6 x 45mm. It has eight PCB layers.

The J model replicates the I/O of the Y model, but like the X model, it offers three SDIO instead of two. It also provides up to two SPI interfaces instead of one, and adds dual CAN ports.



MCC-AM335X-J
(click image to enlarge)

Specifications listed for the MCC-AM335X-J module includes:

  • Processor — TI AM3352 or AM3358 (1x Cortex-A8 @ up to 1GHz); PowerVR SGX 530 3D and 2x PRU-ICSS (AM3358 only on both); other AM335x models available in volume
  • Memory –128MB, 256MB, or 512MB DDR3 SDRAM; 128MB, 256MB, or 512MB NAND flash
  • Networking — gigabit Ethernet PHY supporting 2x ports
  • Other I/O (via 200-pin gold finger SODIMM connector):
    • 2x USB 2.0 OTG
    • Up to 6x serial
    • 2x I2C
    • Up to 2x SPI
    • Up to 2x CAN
    • 8x ADC
    • 2x PWM
    • 3x SDIO (1x multiplexed with NAND flash signals)
  • Other features — Watchdog; 1x user LED
  • Power — +5V/0.8A supply; PMIC (TPS65217C)
  • Operating temperature — 0 to 70°C standard; -40 to 85°C available on request
  • Dimensions — 67.6 x 45mm; 10-layer PCB
  • Operating system — Linux 3.2.0

The MYD-AM335X-J Development Board is listed as “coming soon.” It’s larger than the MYD-AM335X-Y Development Board, at 177 x 106mm. The J carrier board offers all the features of the Y model, except the onboard WiFi. It also adds a second USB host port, and a second isolated CAN port. A microSD slot is available, as well.



MYD-AM335X-J Development Board
(click image to enlarge)

Instead of providing dual serial interfaces, the J board provides six. In place of its real-world serial debug port, it routes debug through a USB interface. You also get a pair of RS485 ports and five RS232 interfaces, one of which is 3-wire, and the rest 5-wire. A battery-backed RTC is also available. Other interfaces are further expressed via a 20-pin connector, as well as a 10-pin connector.

 
Further information

The MCC-AM335X-Y and MCC-AM335X-J modules are each available for $68 in single units, with 256MB each of RAM and flash, and industrial temperature support. This is presumably with the AM3352. Each of the development boards are available for $139, not counting their respective COMS, and in each case, the optional 4.3-inch touchscreen costs $60. More information may be found at the MCC-AM335X-Y and MCC-AM335X-J product pages, respectively, which offer extensive documentation.
 

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