Sentinel Core

Sentinel Core is a 170 x 170 mm Mini-ITX carrier board for the Raspberry Pi Compute Module 5. You fit a CM5 or CM5 Lite onto its two 100-pin connectors and get a board that mounts in a standard Mini-ITX case and runs from a standard ATX power supply, with the module's interfaces brought out on full-size connectors.

The board carries a PCIe x16 slot wired to the module's single PCIe Gen 2 lane, two HDMI 2.0 ports, two stacked USB 3.0 ports with a current-limited power switch, Gigabit Ethernet with ESD protection on the pairs, two 22-pin MIPI connectors for CSI cameras or DSI displays, a 40-pin GPIO header with the Raspberry Pi pinout, two 4-pin 12 V PWM fan headers, a CR2032 holder for the module's real-time clock, a power button and a front-panel header for case LEDs and a power switch.

Power comes from a 24-pin ATX connector or from the USB-C port at 5 V, where the module negotiates up to 5 A over USB PD; an ideal-diode circuit keeps the two inputs apart. The PCIe slot and the fan headers take their 12 V from the ATX supply, so they need the ATX input. The USB-C port also carries the module's USB 2.0 port, and a jumper on the 14-pin service header forces rpiboot mode for flashing the eMMC. GPIO signalling is 3.3 V by default and can be set to 1.8 V with a 0 ohm resistor. The Compute Module is not included.

• Module: Raspberry Pi Compute Module 5 or CM5 Lite, on two 100-pin board-to-board connectors (module not included)
• Form factor: Mini-ITX, 170 x 170 mm
• Expansion: PCIe x16 slot, one lane, PCIe Gen 2 from the module
• Video: 2x HDMI 2.0, full-size connectors
• USB: 2x USB 3.0 Type-A (stacked) with a current-limited power switch; USB 2.0 on the USB-C port
• Network: Gigabit Ethernet RJ45 with integrated magnetics and ESD protection
• Camera and display: 2x 22-pin MIPI connectors (CSI or DSI)
• GPIO: 40-pin header with the Raspberry Pi pinout; 3.3 V signalling by default, 1.8 V selectable with a 0 ohm resistor
• Fans: 2x 4-pin 12 V PWM fan headers, tachometer on one
• RTC: CR2032 battery holder for the module's real-time clock
• Power input: 24-pin ATX connector or USB-C at 5 V, with an ideal-diode circuit between them; 12 V for PCIe and fans comes only from ATX
• Controls: power button, front-panel header for power switch and LEDs, 14-pin service header (rpiboot, EEPROM write protect, PMIC enable, sync out)
• Indicators: power and activity LEDs