https://www.cnx-software.com/2023/12/11/raspberry-pi-releases-pcie-ffc-connector-specifications-new-hat-standard/ Skip to content CNX Software - Embedded Systems NewsCNX Software - Embedded Systems News CNX Software - Embedded Systems News Reviews, tutorials and the latest news about embedded systems, IoT, open-source hardware, SBC's, microcontrollers, processors, and more Orange Pi Amazon StoreOrange Pi Amazon Store Menu * All News * Raspberry Pi * Arduino * Reviews * Tutorials * About + About Us + Contact Us + Advertisement & Consulting Services + Work for Us + Support CNX Software + Privacy Policy * PCBONLINE + PCB Fabrication + PCB Assembly + Box Build Assembly * Industrial Pi + Raspberry Pi Industrial Computers + Raspberry Pi CM4 AI Camera + Raspberry Pi HMI Posted on December 11, 2023December 10, 2023 by Jean-Luc Aufranc (CNXSoft) - 2 Comments on Raspberry Pi releases PCIe FFC connector specifications, new HAT+ standard Raspberry Pi releases PCIe FFC connector specifications, new HAT+ standard Raspberry Pi has released two new specifications one for the PCIe FFC connector and related cable and the other for the new Raspberry Pi HAT+ (HAT Plus) standard that's simpler, takes into account new features in Raspberry Pi 4/5, and has fewer rules around mechanical dimensions. PCIe FFC connector specifications The Raspberry Pi 5 was announced over 2 months ago with a new PCIe FFC connector, and people may been playing around with it and even launching products such as an M.2 HAT for the Raspberry Pi 5 since then even though the pinout and specifications were not available. But Raspberry Pi has now released the specifications (PDF) for the PCIe FFC found in the Raspberry Pi 5 and likely future models as well. Raspberry Pi 5 PCIe pinout and FFC cableRaspberry Pi 5 PCIe pinout and FFC cable The 16-pin 0.5mm pitch FFC connector features a single lane PCIe interface, something we knew already, but the pinout diagram and recommendations for the FFC cable (up to 50mm in length with controlled impedance to 90R+/- 10%) have now been made available as well. The PCIe interface is re-confirmed to be PCIe Gen 2 in the specs and the announcement, although Jeff Geerling managed to change settings to enable PCIe Gen 3. Raspberry Pi HAT+ standard The Hardware on Top (HAT) standard for expansion boards connected on top of the Raspberry Pi SBC was introduced in 2014, and Raspberry Pi just announced that the original HAT specification is now deprecated, and replaced with the HAT+ specification (PDF) although this is still preliminary. The main changes with the HAT+ specification are: * HAT+ boards must be electrically compatible with the STANDBY power state, where the 5V power rail is powered, but the 3.3V rail is unpowered. Note: Raspberry Pi 4 and Raspberry Pi 5 support the STANDBY state, while older Raspberry Pi models do not. * The specification is less prescriptive about HAT physical dimensions. * The HAT EEPROM content is now much simpler. * A special class of HAT+s that can be stacked with an extra HAT+ on top is supported for a maximum stack of two HATs. * HAT+ boards are electrically backwards-compatible with older Raspberry Pi models, but may need up-to-date software and firmware to function correctly. The first one may be important to power consumption in power off mode. Let me explain. The Raspberry Pi boards now support two standby modes: * WARM-STANDBY - The Raspberry Pi is halted/off, but all of the power rails are still enabled. This is the default mode when doing a sudo halt or soft power-button-off operation. * STANDBY - The Raspberry Pi has the 5V rail powered -- so the power management chip is powered -- but no other power supplies on the PMIC and board are enabled. You can configure sudo halt or power-button-off using the EEPROM to enter this mode instead of WARM-STANDBY. WARM-STANDBY is the default in Raspberry Pi OS so both 5V and 3.3V are enabled and that's why I measured a 1.7W power consumption for the Raspberry Pi 5 when it is powered off... We can change /boot/ config.txt (POWER_OFF_ON_HALT=1, WAKE_ON_GPIO=0) to bring that down to about zero as found in the documentation and tested by Jeff Geerling. So why it's not enabled by default? That's because some HATs require both 5V and 3.3V. But the new HAT+ add-on boards will have to work with the STANDBY mode at 5V only. What does "less prescriptive HAT dimensions" mean exactly? That's pretty simple: a HAT+ board only needs to connect to the 40-way GPIO header (including the ID_* pins), and to have at least one mechanical mounting hole align with one of the four Raspberry Pi mounting holes, and that's about it which should allow for more form factors. You're also asked not to mess with access to other connectors and the Raspberry Pi 5 Active cooler... M.2 HAT+ for Raspberry Pi 5M.2 HAT+ for Raspberry Pi 5Prototype of the M.2 HAT+ for Raspberry Pi 5 - The final version will be different since it blocks the MIPI connectors... M.2 HAT+ dimensionsM.2 HAT+ dimensionsM.2 HAT+ dimensions (Final version? with 10mm cutout for MIPI connectors) One reason the just released HAT+ specification is still preliminary is that the EEPROM utilities have yet to be updated for the new, simpler EEPROM parameters. The final version of the specification along with the official M.2 HAT+ board will be released next year. Jean Luc AufrancJean Luc Aufranc Jean-Luc Aufranc (CNXSoft) Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011. Share this: Support CNX Software! Donate via cryptocurrencies or become a Patron on Patreon ROCK Pi 4C PlusROCK Pi 4C Plus Tagspcie, Raspberry Pi, standard UP 7000 x86 SBCUP 7000 x86 SBC Related posts: 1. RadioShuttle Network Protocol is an Efficient, Fast & Secure Alternative to LoRaWAN Protocol 2. New Raspberry Pi 4 VLI Firmware Lowers Temperature by 3-5degC 3. ROCK Pi SATA HAT Targets ROCK Pi 4 & Raspberry Pi 4 NAS 4. Raspberry Pi Compute Module 4 Coming Next Year with PCIe/NVMe Support 5. RAK2287 Mini PCIe LoRaWAN Concentrator Module Supports up to 500 Nodes per km2 Subscribe Login Notify of [new follow-up comments ] [ ] [>] Connect with: FacebookFacebook GoogleGoogle TwitterTwitter guestguest Label [ ] {} [+] [ ] [ ] Name* [ ] Email* [ ] Website [ ] I agree to the Privacy Policy The comment form collects your name, email and content to allow us keep track of the comments placed on the website. Please read and accept our website Terms and Privacy Policy to post a comment. 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[ ] [Post Comment] 2 Comments oldest newest LucLuc Luc 3 hours ago I see some contradictions between "You're also asked not to mess with access to ... the Raspberry Pi 5 Active cooler" and the photo/drawing of the M2 prototype Hat Reply WillyWilly Willy 3 hours ago Luc given that we've already seen enclosures with a fan without heat sink, maybe they intend to glue a fan on the bottom of the hat directly in front of the CPU this time Reply Khadas VIM4 SBCKhadas VIM4 SBC Post navigation Previous PostPrevious UP 7000 SBC review - Part 2: Ubuntu 22.04 on a fanless Intel N100 single board computer Search for: [ ] Search COM-HPC Raptor Lake-S moduleCOM-HPC Raptor Lake-S module Trending Posts - Last 7 Days * Radxa Zero 3W SBC - Rockchip RK3566 SoC, 8GB RAM, WiFi 6 in Raspberry Pi Zero 2 W form factor 5.3k views | 5 comments * Raspberry Pi releases PCIe FFC connector specifications, new HAT+ standard 3.6k views | 2 comments * LILYGO Mini E-Paper Core IoT controller gets ESP32-S3 wireless microcontroller 2.7k views | 0 comments * Add WiFi connectivity to older USB printers with Orange Pi 3G-IoT-A and UoWPrint print server 2.7k views | 2 comments * Lenovo Chromebox Micro fanless mini PC runs ChromeOS, targets digital signage applications 2.4k views | 3 comments Subscribe to Comments RSS Feed SPONSORS Gateworks rugged industrial IoT SBCGateworks rugged industrial IoT SBC UGOOS TV boxes 2024UGOOS TV boxes 2024 Geniatech Raspberry Pi 4 alternative 2023Geniatech Raspberry Pi 4 alternative 2023 Rikomagic digital signage 2023Rikomagic digital signage 2023 Mekotronics R58X-HDD RK3588 8K Arm mini PCMekotronics R58X-HDD RK3588 8K Arm mini PC Rockchip RK3588 system-on-moduleRockchip RK3588 system-on-module Advertisement Recent Comments * Willy on Raspberry Pi releases PCIe FFC connector specifications, new HAT+ standard * Luc on Raspberry Pi releases PCIe FFC connector specifications, new HAT+ standard * back2future on Orange Pi AIPro SBC features a 20 TOPS Huawei Ascend AI SoC * back2future on Orange Pi AIPro SBC features a 20 TOPS Huawei Ascend AI SoC * Midgy on Arduino Portenta X8 achieves EU's Cyber Resilience Act (CRA) compliance Videostrong KA2 AI Smart BoxVideostrong KA2 AI Smart Box Latest Reviews * UP 7000 Ubuntu 22.04 reviewUP 7000 Ubuntu 22.04 reviewUP 7000 SBC review - Part 2: Ubuntu 22.04 on a fanless Intel N100 single board computer The UP 7000 is a credit card-sized Alder Lake-N single board computer that can be used as an alternative to [...] * LASER LONGER B1 30W reviewLASER LONGER B1 30W reviewLONGER Laser B1 30W review - A 33-36W laser engraver tested with LightBurn Today we will review the LONGER Laser B1 30W laser engraver with the LightBurn program. 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