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Copyright © 2012, Intel Corporation. 2 Thin Mini-ITX Based PC System Design Guide 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 Thin Mini-ITX Based PC System Design Guide 3 4.3.2 Platform Controller Hub (PCH) Cooling ........................................ 41 4.3.3 Voltage Regulator Cooling .......................................................... 41 4.4 Acoustics .............................................................................................. 42 5 Mechanical ....................................................................................................... 44 5.1 CPU Mechanicals .................................................................................... 44 5.2 Internal Motherboard Header Locations .................................................... 45 5.3 System Cables and Connectors ................................................................ 46 5.3.1 System Cable Kitting ................................................................. 46 5.4 CPU Thermal Solution and System Fan Mechanical Interface ....................... 46 5.5 Thin Mini-ITX I/O Shield ......................................................................... 50 5.6 Industrial Design, System Layout, and Usability Considerations ................... 51 5.6.1 AIO Specific System Mechanicals ................................................ 52 6 Low Profile Reference Heat Pipe Thermal Solution ................................................. 53 6.1 General Volumetrics / Requirements ........................................................ 53 6.2 Reference Design CPU Thermal Solution ................................................... 53 7 Reference System Layouts ................................................................................. 55 7.1 Thin Mini ITX Based System Design .......................................................... 55 7.1.1 General System Design Considerations ........................................ 55 7.2 Reference Core Components Layouts ........................................................ 56 7.3 Thermal Test Method .............................................................................. 65 7.3.1 Components Used for Testing ..................................................... 65 7.3.2 Stress Software ........................................................................ 66 7.3.3 Temperature Measurement Locations .......................................... 67 Figures Figure 1-1. Thin Mini-ITX Applications ................................................................. 9 Figure 1-2. Mini-ITX (left) vs Thin Mini-ITX (right) ............................................... 11 Figure 2-1. 40-pin LVDS Header ........................................................................ 15 Figure 2-2. 40-pin eDP MB Header ..................................................................... 17 Figure 2-3. PC & Software Brightness Control: .................................................... 19 Figure 2-4. FPD Brightness Header .................................................................... 19 Figure 2-5. Front Panel Audio Header ................................................................. 21 Figure 2-6. Internal Stereo Speakers Header ....................................................... 22 Figure 2-7. DMIC MB Header ............................................................................. 23 Figure 2-8. 2x5 USB 2.0 Header (Keyed at Pin 9) ................................................ 24 Figure 2-9. 2x5 USB 2.0 Header (Keyed at Pins 9 and 10) .................................... 25 Figure 2-10. 1x5 USB 2.0 Header ...................................................................... 26