圖片來源：MxL7704 PMIC Powers the Raspberry Pi 4 樹莓派目前使用中的供電系統是在 3B+ 開始改用的。供電系統的好壞對樹莓派來說是非常重要，一個運作良好的供電系統可以確保整塊板子的各功能運作正常，一旦供電出問題時，可能對板子所有功能造成各種問題，例如 USB、WiFi 功能失效或不正常，最嚴重的慘況就是讓整塊板子完全停擺變成一塊磚頭。 《供電系統之演進》 樹莓派供電系統的演進可以分成三個階段： 《第一階段是 Pi2 以前的供電》 重點提示：這代整體的供電源頭是來自於 Micro USB 5V，再轉換成 3.3V、2.5V、1.8V等部份供給系統上元件使用。 圖片來源：Introducing the Raspberry Pi Model B+ 接著來看看電路圖了解電源是怎開始的。電源從左側MICRO USB TYPE B這接頭端開始，經過 F3 保險絲再來到 D17 TVS（Transient voltage suppressor）及後端的濾波電容。 這樣的電路設計有什麼優點： 電路設計簡單，價錢便宜。 … Continue reading →
The official and recommended USB-C power supply for Raspberry Pi 4
《規格》
* 45 X 48 X 27mm (不含線長及插頭長)
* 線長：約 1.5M(18 AWG captive cable)
* 插頭類型：USB Type-C
* Input：96V-264V AC
* Output：5.1V DC up to 3.0 A
* 輸出功率：15.3W
* 具短路、過載及過熱保護
* 顏色：黑色 / 白色隨機出貨
2019-06-20:
* Based on Debian Buster
* Support for Raspberry Pi 4 hardware
* FKMS OpenGL desktop graphics driver and xcompmgr compositing window manager used when running on Raspberry Pi 4
* Screen Configuration application added for use with FKMS driver
* Raspberry Pi 4 video output options added to Raspberry Pi Configuration
* Uses new PiXflat UI theme for GTK and Openbox
* CPU activity gauge plugin no longer shown on taskbar by default
* CPU temperature gauge plugin added (not shown by default)
* USB ejecter and Bluetooth taskbar icons hidden when not appropriate
* Version 74.0.3729.157 of Chromium web browser included
* Version 32.0.0.207 of Flash player included
* IDLE Python IDE removed
* Wolfram Mathematica removed temporarily due to incompatibility with Buster
* Display of package sizes removed from Recommended Software
* Appearance Settings modified to support independent settings for two monitors
* Oracle Java 7 and 8 replaced with OpenJDK 11
* Miscellaneous small bug fixes
* On-board 5GHz WiFi blocked by rfkill by default
The block is removed when taking one of the following actions:
- Selecting a locale in the first run wizard
- Setting the WiFi country in the Raspberry Pi Configuration tool or the Network Settings applet
- Setting the WiFi country in raspi-config
- Providing a wpa_supplicant.conf file through the boot partition
- Running 'rfkill unblock wifi'
* Boot partition size set to 256M
* Linux kernel 4.19.50
* Raspberry Pi firmware 88ca9081f5e51cdedd16d5dbc85ed12a25123201
