Thin Mini-ITX Based PC System Design Guide 3
Contents
1 Introduction ...................................................................................................... 8
1.1 Purpose / Scope ..................................................................................... 8
1.2 Overview ............................................................................................... 8
1.2.1 All In One PCs ........................................................................... 9
1.2.2 Tiny PCs .................................................................................. 10
1.3 Terminology .......................................................................................... 11
1.4 Reference Documents ............................................................................. 12
2 Thin Mini-ITX Internal Electrical Interfaces ........................................................... 13
2.1 Common Connector List .......................................................................... 13
2.2 Flat Panel Display .................................................................................. 14
2.2.1 LVDS ...................................................................................... 14
2.2.2 eDP (VESA Embedded Display Port™) ......................................... 17
2.2.3 Flat Panel Display Brightness ..................................................... 19
2.2.4 On Screen Display (OSD) ........................................................... 20
2.3 Audio ................................................................................................... 21
2.3.1 Front Panel Audio ..................................................................... 21
2.3.2 Internal Stereo Speakers ........................................................... 22
2.3.3 Digital Microphone .................................................................... 23
2.4 SATA .................................................................................................... 24
2.5 Internal USB ......................................................................................... 24
2.5.1 Front Panel Dual USB 2.0 Header ............................................... 24
2.5.2 Internal Dual USB 2.0 Header .................................................... 25
2.5.3 Internal Single USB 2.0 Header .................................................. 26
2.5.4 Internal USB 3.0 Header ............................................................ 26
2.6 Front Panel (Buttons, LEDs) .................................................................... 28
2.7 Internal Power Input .............................................................................. 29
2.8 Fans ..................................................................................................... 31
2.8.1 CPU Fan .................................................................................. 31
2.8.2 System Fan ............................................................................. 31
2.9 Consumer Infrared Receiver .................................................................... 32
2.10 Wireless Bluetooth ................................................................................. 32
2.11 Monitor Switch ...................................................................................... 32
3 Power Supply ................................................................................................... 34
3.1 External AC Adapter ............................................................................... 34
3.2 External Power Connector for Socketed CPU Based Systems........................ 34
4 Thermals & Acoustics ........................................................................................ 36
4.1 General Thermal-Acoustics Considerations ................................................ 36
4.1.1 Blowers ................................................................................... 37
4.1.2 Fan Speed Control and CPU Throttling ......................................... 37
4.1.3 Vent Free Area Ratio ................................................................. 40
4.1.4 Dust Considerations .................................................................. 40
4.2 Environmental and Skin Temperature Limit Recommendations .................... 40
4.3 Motherboard Component Cooling ............................................................. 40
4.3.1 Memory Cooling ....................................................................... 40