【BCM2712 晶片】：

 　　BCM2712 is a new 16-nanometer application processor (AP) from Broadcom, derived from the 28-nanometer BCM2711 AP which powers Raspberry Pi 4, with numerous architectural enhancements. At its heart is a quad-core 64-bit Arm Cortex-A76 processor, clocked at 2.4GHz, with 512KB per-core L2 caches, and a 2MB shared L3 cache. Cortex-A76 is three microarchitectural generations beyond Cortex-A72, and offers both more instructions per clock (IPC) and lower energy per instruction. The combination of a newer core, a higher clock speed, and a smaller process geometry yields a much faster Raspberry Pi, and one that consumes much less power for a given workload.

　　Our newer, faster CPU is complemented by a newer, faster GPU: Broadcom’s VideoCore VII, developed here in Cambridge, with fully open source Mesa drivers from our friends at Igalia. An updated VideoCore hardware video scaler (HVS) is capable of driving two simultaneous 4Kp60 HDMI displays, up from single 4Kp60 or dual 4Kp30 on Raspberry Pi 4. A 4Kp60 HEVC decoder and a new Image Sensor Pipeline (ISP), both developed at Raspberry Pi, round out the multimedia subsystem. To keep the system supplied with memory bandwidth, we have a 32-bit LPDDR4X SDRAM subsystem, running at 4267MT/s, up from an effective 2000MT/s on Raspberry Pi 4.

【RP1】

　　Previous Raspberry Pi generations were built on a monolithic AP architecture: while some peripheral functions were provided by an external device (the Via Labs VL805 USB controller and hub on Raspberry Pi 4, and the Microchip LAN951x and LAN7515 USB hub and Ethernet controller chips on earlier products), substantially all of the I/O functions were integrated into the AP itself. Fairly early in the history of Raspberry Pi, we realised that as we migrated the AP to progressively newer process nodes, this approach would eventually become both technically and economically unsustainable.

　　Raspberry Pi 5, in contrast, is built on a disaggregated chiplet architecture. Here, only the major fast digital functions, the SD card interface (for board layout reasons), and the very fastest interfaces (SDRAM, HDMI, and PCI Express) are provided by the AP. All other I/O functions are offloaded to a separate I/O controller, implemented on an older, cheaper process node, and connected to the AP via PCI Express.

　　RP1 is our I/O controller for Raspberry Pi 5, designed by the same team at Raspberry Pi that delivered the RP2040 microcontroller, and implemented, like RP2040, on TSMC’s mature 40LP process. It provides two USB 3.0 and two USB 2.0 interfaces; a Gigabit Ethernet controller; two four-lane MIPI transceivers for camera and display; analogue video output; 3.3V general-purpose I/O (GPIO); and the usual collection of GPIO-multiplexed low-speed interfaces (UART, SPI, I2C, I2S, and PWM). A four-lane PCI Express 2.0 interface provides a 16Gb/s link back to BCM2712.

　　Under development since 2016, RP1 is by a good margin the longest-running, most complex, and (at $15 million) most expensive program we’ve ever undertaken here at Raspberry Pi. It has undergone substantial evolution over the years, as our projected requirements have changed: the C0 step used on Raspberry Pi 5 is the third major revision of the silicon. And while its interfaces differ in fine detail from those of BCM2711, they have been designed to be very similar from a functional perspective, ensuring a high degree of compatibility with earlier Raspberry Pi devices.

【DA9091】

　　BCM2712 and RP1 are supported by the third new component of the chipset, the Renesas DA9091 “Gilmour” power-management IC (PMIC). This integrates eight separate switch-mode power supplies to generate the various voltages required by the board, including a quad-phase core supply, capable of providing 20 amps of current to power the Cortex-A76 cores and other digital logic in BCM2712.

　　Like BCM2712, DA9091 is the product of a multi-year co-development effort. Working closely with the Renesas team in Edinburgh allowed us to produce a PMIC which is precisely tuned for our needs. And we were able to squeeze in two frequently requested features: a real-time clock (RTC), which can be powered by an external supercapacitor or a rechargeable lithium-manganese cell; and a PC-style power button, supporting hard and soft power-off and power-on events.

　　Two other elements of the chipset have been retained from Raspberry Pi 4. The Infineon CYW43455 combo chip provides dual-band 802.11ac Wi-Fi and Bluetooth 5.0 with Bluetooth Low-Energy (BLE); while the chip itself is unchanged, it is provided with a dedicated switched power supply rail for lower power consumption, and is connected to BCM2712 by an upgraded SDIO interface which supports DDR50 mode for higher potential throughput. As before, Ethernet connectivity is provided by a Broadcom BCM54213 Gigabit Ethernet PHY; this now sits at a jaunty 45-degree angle, a first for Raspberry Pi, and a source of enduring disappointment for orthogonal-layout enthusiast and CTO (Software) Gordon Hollingworth.

【Form-factor evolution】

　　On the outside, Raspberry Pi 5 closely resembles its predecessors. But, while retaining the overall credit-card-sized footprint, we’ve taken the opportunity to update some elements of the design, to align with the capabilities of the new chipset.

　　We’ve removed the four-pole composite video and analogue audio jack from the board. Composite video, now generated by RP1, is still available from a pair of 0.1”-spaced pads on the bottom edge of the board.

　　We now sport a pair of FPC connectors, in the space formerly occupied by the four-pole jack and camera connector. These are four-lane MIPI interfaces, using the same higher-density pinout found on various generations of Compute Module I/O board; and they are bi-directional (transceiver) interfaces, meaning that each one can connect either to a CSI-2 camera or to a DSI display. The space on the left of the board formerly occupied by the display connector now contains a smaller FPC connector which provides a single lane of PCI Express 2.0 connectivity for high-speed peripherals.

　　The Gigabit Ethernet jack has returned to its classic position in the bottom right corner of the board, after a brief sojourn in the top right on Raspberry Pi 4. And it’s brought with it the four-pin PoE connector, simplifying the board layout at the cost of a compatibility break with our existing PoE and PoE+ HATs.

　　Finally, we’ve grown a pair of mounting holes for a heatsink, as well as JST connectors for the RTC battery (two pins), Arm debug and UART (three pins), and fan with PWM control and tacho feedback (four pins).

ＰＳ．結論：尺寸一樣，移除音訊插孔，增加一個FPC 接口、增加了3個JST接口（可接風扇、RTC）、增加主板開關，POE腳換位置

 

　　In parallel with the final stages of the Raspberry Pi 5 programme, our software team has been busy developing a new version of Raspberry Pi OS, the official first-party operating system for Raspberry Pi devices. This is based on the most recent release of Debian (and its derivative Raspbian), codenamed “Bookworm”, and incorporates numerous enhancements, notably the transition from X11 to the Wayfire Wayland compositor on Raspberry Pi 4 and 5.

　　Raspberry Pi OS will launch in mid-October, and will be the sole supported first-party operating system for Raspberry Pi 5. Keep checking back here: we’ll be telling you some more about the new OS, and you’ll be able to download it shortly before Raspberry Pi 5 arrives on the shelves in late October.

 

 

【Accessories】必備配件：

　　Our accessories for Raspberry Pi 5 are carefully designed to make sure you get the most from your computer

Ａ．原廠外殼（附風扇）紅白外殼、草莓外殼－－另購

裝扮得時尚，同時保持涼爽

　　新的冷卻選項可確保您的 Pi 5 在負載下保持舒適，Raspberry Pi 5 官方保護殼 現在配有內建風扇和可拆卸蓋子

　　　An integrated 2.79 (max) CFM fan, with fluid dynamic bearings selected for low noise and an extended operating lifetime, connects to the four-pin JST connector on Raspberry Pi 5 to provide temperature‑controlled cooling. Air is drawn in through a 360‑degree slot under the lid, blown over a heatsink attached to the BCM2712 AP, and exhausted through connector apertures and vents in the base.

　　We’ve lengthened the case, and tweaked the retention features, to make it possible to insert the Raspberry Pi 5 board without removing the SD card. And by removing the top of the case, it is now possible to stack multiple cases, as well as to mount HATs on top of the fan, using spacers and GPIO header extensions.

Ｂ．原廠電源（新款5.1V 5A）5v 3a也能用：－－另購

　Raspberry Pi 5 將使用 5V 3A USB-C 電源，但要釋放最佳效能，您需要使用 官方 27W USB-C PD 電源，特別是如果您打算為 USB 驅動器等耗電週邊供電。

ｐｓ．5V 3A 15w 通常仍足以驅動滑鼠、鍵盤和其他低功耗週邊裝置。（超過電壓須更換5A 電源）

　　Raspberry Pi 5 consumes significantly less power, and runs significantly cooler, than Raspberry Pi 4 when running an identical workload. However, the much higher performance ceiling means that for the most intensive workloads, and in particular for pathological “power virus” workloads, peak power consumption increases to around 12W, versus 8W for Raspberry Pi 4.

　　When using a standard 5V, 3A (15W) USB-C power adapter with Raspberry Pi 5, by default we must limit downstream USB current to 600mA to ensure that we have sufficient margin to support these workloads. This is lower than the 1.2A limit on Raspberry Pi 4, though generally still sufficient to drive mice, keyboards, and other low‑power peripherals.

　　For users who wish to drive high-power peripherals like hard drives and SSDs while retaining margin for peak workloads, we are offering a $12 USB-C power adapter which supports a 5V, 5A (25W) operating mode. If the Raspberry Pi 5 firmware detects this supply, it increases the USB current limit to 1.6A, providing 5W of extra power for downstream USB devices and 5W of extra on-board power budget: a boon for those of you who want to experiment with overclocking your Raspberry Pi 5.

　　It should be noted that users have the option to override the current limit, specifying the higher value even when using a 3A adapter. In our testing, we have found that in this mode Raspberry Pi 5 functions perfectly well with typical configurations of higher-power USB devices, and all but the most pathological workloads.

Ｃ．Active Cooler 冷卻風扇（鋁風扇、散熱片一體式）：－－另購

　　如果您希望您的 Raspberry Pi 5 能夠長時間、有效率地運作而不出汗，那麼您就該為它配備主動冷卻器了

　　Raspberry Pi 5 has been designed to handle typical client workloads, uncased, with no active cooling. Users who wish to use the board uncased under continuous heavy load, without throttling, have the option of adding a Active Cooler. This attaches to the board via two new mounting holes, and connects to the same four-pin JST connector as the case fan..

　　A radial blower, again selected for low noise and extended operating lifetime, pushes air through an extruded and milled aluminium heatsink. Both the case and the Active Cooler are able to keep Raspberry Pi 5 well below the thermal throttle point for typical ambient temperatures and worst-case loads. The cooling performance of the Active Cooler is somewhat superior, making it particularly suitable for overclockers.

【非必備】配件：

【Camera and display cables】－－另購

　　The new, higher-density pinout of the MIPI connectors means that an adapter is required to connect our own cameras and displays, and third-party products, to Raspberry Pi 5.

　　To support existing camera and display owners, we are offering FPC camera and display cables, which convert from the higher-density format (now referred to as “mini”) to the older lower-density format (now referred to as “standard”). These cables are available in 200mm, 300mm, and 500mm lengths．

 

　　Camera Module 3, the High-Quality Camera, the Global Shutter Camera, and the Touchscreen Display will all ship with both a standard-to-standard and a 200mm mini-to-standard cable.

【PoE+ HAT】擴展板－－另購

　　From early 2024, we will be offering a new PoE+ HAT. This supports the new location for the four-pin PoE header, and has an L-shaped form factor which allows it to sit inside the Raspberry Pi 5 case without interfering mechanically or disrupting airflow.

　　Prototype PoE+ HAT. We don’t know yet what the production version will look like, but we do know that it won’t look like this.

　　The new PoE+ HAT integrates a planar transformer into the PCB layout, and utilises an optimised flyback converter architecture to sustain high efficiency across the whole zero to 25W range of output powers.

【M.2 HATs】擴展板－－另購

　　One of the most exciting additions to the Raspberry Pi 5 feature set is the single-lane PCI Express 2.0 interface. Intended to support fast peripherals, it is exposed on a 16-pin, 0.5mm pitch FPC connector on the left-hand side of the board.

　　From early 2024, we will be offering a pair of mechanical adapter boards which convert between this connector and a subset of the M.2 standard, allowing users to attach NVMe SSDs and other M.2-format accessories. The first, which conforms to the standard HAT form factor, is intended for mounting larger devices. The second, which shares the L-shaped form factor of the new PoE+ HAT, supports mounting 2230- and 2242-format devices inside the Raspberry Pi 5 case.

Prototype M.2 HAT. Final hardware will not look like this.／M.2 HAT 原型。最終的硬體不會是這樣的。

【RTC battery】電池－－另購

　　Last, but very much not least, we have sourced a Panasonic lithium manganese rechargeable coin cell, with a pre-fitted two-pin JST plug and an adhesive mounting pad. This is priced  and is suitable for powering the Raspberry Pi 5 real-time clock (RTC) when the main power supply is disconnected.

【Raspberry Pi Beginner’s Guide, 5th Edition】第５版書－－另購

　　Sporting a brand-new look and feel, and priced at RRP £19.99 , this new edition of our bestselling Raspberry Pi Beginner’s Guide is the definitive manual for Raspberry Pi computers and accessories. It has been comprehensively updated to cover Raspberry Pi 5, and the upcoming release of Raspberry Pi OS based on Debian Bookworm.

 

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