Electronic Design
1 Freescalersquos iMX 6Dual SCM single chip module mixes an SoC with DRAM and SPI flash via a multichip carrier

1. Freescale’s i.MX 6Dual SCM (single chip module) mixes an SoC with DRAM and SPI flash via a multichip carrier.

Multidie IoT SoC Blends Micro and Memory

Freescale’s i.MX 6Dual SCM (single chip module) mixes an SoC with DRAM and SPI flash via a multichip carrier for a highly integrated Internet of Things (IoT) platform (Fig. 1). It packs in 16 Mbytes of SPI NOR flash memory and 1 or 2 Gbytes of LPDDR2 memory with a dual-core, ARM Cortex-A9 system on-chip (SoC).

This is one chip that I think will have a significant impact on IoT applications because of the integration that used to be exclusive to mobile platforms where the cost could be borne by top-end smartphones. The i.MX 6Dual SCM is relatively inexpensive and low power, while providing a great development platform.

The SoC reduces a three-chip system to a single chip that is more efficient and more powerful than earlier i.MX platforms. The dual ARM cores are blended with impressive graphics and imaging capabilities (Fig. 2). The graphics engines support 2D and 3D multimedia. It has 1080p30 encode and decode support for streaming media. The image processing unit (IPU) supports image enhancement. The display and camera input support includes HDMI and LVDS display support as well as 20-bit CSI (camera serial interface) and MIPI interfaces.

2. The i.MX 6Dual SCM has impressive graphics and imaging support as well as connectivity and security support needed for IoT applications. (Click image for expanded view).

Security is critical to IoT and the chip has a hardware random number generator as well as secure boot support. It supports ARM’s TrustZone and it even has a secure real time clock (RTC).

The chip is designed for connected applications. Off-chip wireless will be common, but its on-chip wired connectivity including USB 2 with PHYs including OTG support, dual FlexCAN interfaces, lots of serial interfaces including SPI and I2C, and 1 Gbit Ethernet with IEEE 1588 support. Other interfaces include x1 PCI Express 2.0, MIPI HSI, S/PDIF audio, and I2S/SSI. For storage the chip supports MMC 4.4, NAND flash memory controller, and 3 Gbit/s SATA with PHY. These interfaces provide expansion if developers need more than the support built into the chip.

3. The Freescale development board exposes all the chip’s interfaces but the chip targets much more compact IoT applications.

The chip has a very compact form factor at only 17 mm by 14 mm. It is only 1.7 mm high. The chip is dwarfed by its development board (Fig. 3). The board provides access to all the interfaces including a mini-PCIe socket.

Software support already exists for the i.MX platform. These tools are compatible with the i.MX 6Dual SCM. There is a wide selection of operating systems available for i.MX systems including Linux, Micrium’s µC/os II and III and Green Hiils Software’s Integrity.

4. InHand Electronic’s Fury-M6 builds on the Freescale i.MX 6Dual SCM adding wireless and display support in a compact package.

InHand Electronic’s Fury-M6 (Fig. 4) takes advantage of the i.MX 6Dual SCM. The Fury-M6 adds 802.11 b/g/n and Bluetooth BLE wireless support as well as an LCD with touchscreen in a 2.75-in by 2-in package. The system also has a built-in battery charger and exposes a host of peripheral interfaces. It can run Linux or Android.

Freescale has essentially packed a module into a single chip that can run without a heatsink while providing a very powerful IoT platform. 

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