I did want to mention the Gumstix Raspberry Pi CM4 + Pixhawk FMUv6 board (Fig. The Ethernet has power-over-Ethernet (PoE) protection, but not the support that will normally be found on the carrier board. The system requires only 3.3-and 12-V power. Overall, system design is relatively straightforward. There are 90- and 100-Ω differential pairs on the connectors. Keep in mind that this can be a bit more challenging than in the past due to the high-speed interfaces, although some existed on earlier compute modules as well. It even has a x1 PCI Express connector.Īll CAD files are readily available in case you want to design your own carrier board. This makes it possible to link the module to the plethora of Raspberry Pi expansion modules that have fomented the platform’s popularity. It exposes all of the interfaces via connectors and even includes a Raspberry Pi HAT connector. Various carrier boards are already on the market for the CM4, but the standard CM4IO Board is typical (Fig. I wouldn’t be surprised to see a carrier board with one or more M.2 connectors on the flip side, providing high-speed interfaces and storage. The 55- × 40-mm module can easily be mounted atop a small stack of boards or a small carrier board for a very compact design. The compact size is also a benefit in embedded applications. The module design is also more amenable to cooling, although the chips can be used with no heatsink at all depending on the application. With its four mounting holes, the module can be locked down tight, which is critical for rugged applications. Use of two low-profile connectors is a good starting point. Most of the pins on the two headers are for GPIO, along with the usual smattering of I 2C, SDIO/eMMC, and analog found on the usual Raspberry Pi header. Newark also provides all versions of the CM4. Developers should check out Newark’s SC0480 Antenna Kit if they need additional wireless range or performance (Fig. This is handy for very small systems that may not need the range provided by an external antenna. The wireless support includes a switch-selectable on-module antenna. There are dual DSI MIPI serial display interfaces as well. The H.265 supports 4K60 decode and the H.264 support handles 1080p60 decode and 1080p30 encode. Inclusion of a CSI-2 camera interface plus dual HDMI interfaces make this an interesting platform for digital-signage applications. Memory and storage are the other factors that change up to 8 GB of LPDDR4-3200 DRAM and 34 GB of eMMC flash memory. All versions include the Broadcom BCM2711, which is a 1.5-GHz, 64-bit, quad-core Arm Cortex-A72 processor. The CM4 comes in a number of versions, starting with one at $25 that skip things like Wi-Fi 802.11b/g/n/ac and Bluetooth 5.0 support. However, it also opens up the use of NVMe storage as well as access to any number of PCIe-based peripherals like additional Ethernet interfaces. The PCIe interface can be used to add the USB 3 support back. The limitation of Gen 2 or x1 isn’t that significant, as the performance of the host is the limiting factor rather than the size of the pipe. The addition of a PCI Express switch would allow a carrier board to implement any number of high-speed interfaces. The x1 PCI Express (PCIe) Gen 2 interface is the more interesting addition, or rather exposer, as it opens the platform up to significant expansion. There is a USB 2 interface, but if you need a USB 3 interface, then a PCI Express-based USB 3 interface must be added to the mix. The biggest change is elimination of the USB 3 interface that was included in the Raspberry Pi 4. The CM4 sports a pair of 100-pin connectors on the read (Fig. Though this makes the CM4 incompatible with previous carrier boards, fear not, there’s a horde awaiting the pent-up demand for this new module. The new module deviates from the edge-connector approach of the earlier Raspberry Pi compute modules. 1) could be one of the most significant announcements this year for the maker space. The Raspberry Pi CM4 compute module (Fig.
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