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Advantech SOM-Express Design Guide

96 Chapter 6 Power Delivery Guidelines

6.2.2 AT Power Delivery Block Diagram

An AT power source will provide 12 V and 5 V power. An additional switching

regulator or LDO will be required to simulate the ATX power (3.3 V…) .There will be

no standby voltage when an AT power source is used.

Figure 6-2 AT Power Delivery Block Diagram

1 2 ... 91 92 93 94 95 96 97 98 99 100 101 ... 111 112

Advantech 1
Notices 2
Revision History 2
Table of Contents 3
4 Table of Contents 4
Table of Contents 5 5
6 Table of Contents 6
Table of Contents 7 7
8 Table of Contents 8
Chapter 1 Introduction 9
1.2 Referenced Documents 10
2.1 Overview 11
2.2 Specifications 13
2.2.1 SOM-5780 14
2.2.2 SOM-5782 16
2.2.3 SOM-DB5700 18
2.3 System Resources 19
2.3.1 SOM-5780 Resources 19
2.3.2 SOM-5782 Resources 22
2.4 PCI Routing 25
2.5 DC Specifications 25
2.5.1 Interface I/O Voltage 25
2.5.1.3 Audio 27
2.5.1.4 VGA 27
2.5.1.5 LCD 28
2.5.1.6 IDE 28
2.5.1.7 Ethernet 28
2.5.1.8 TV-Out Bus 28
2.5.1.9 IrDA 28
2.6 AC Specification 29
2.6.1 PCI-Bus AC Spec 29
2.6.3 Audio AC Spec 29
2.6.4 VGA AC Spec 29
2.6.5 IDE AC Spec 30
2.6.6 I2C AC Spec 30
2.6.7 SMBus AC Spec 30
Chapter 3 Pin Assignments 31
3.1 Row A 32
3.2 Row B 33
3.3 Row C 34
3.4 Row D 35
4.1 Nominal Board Stack-Up 36
Thickness 37
4.3 Alternate Stack Ups 39
5.1 PCI-Bus 40
5.1.1 Signal Description 40
5.1.2 Design Guidelines 41
Vtest 0.4 Vcc 1.5 V 42
Tskew 2 (max) 2 (max) ns 42
5.1.3 Layout Guidelines 44
Carrier 45
5.1.4 Application Notes 46
5.2.1 Signal Description 47
5.2.2 Design Guidelines 47
5.2.3 Layout Guideline 48
SOM-Express 49
USB Connector 49
5.2.3.4 Stubs 50
5.3.1 Signal Description 51
5.3.2 Design Guidelines 51
5.3.2.3 Azalia: 52
Analog Ground 53
5.3.3 Layout Guidelines 54
± 15% 54
5.4 VGA 56
5.4.1 Signal Description 56
5.4.2 Design Guidelines 57
5.4.3 Layout Guideline 57
VGA Connector 58
5.5 LVDS 59
5.5.1 Signal Description 59
5.5.2 Design Guideline 59
5.5.3 Layout Requirements 60
5.6 Primary IDE0 61
5.6.1 Signal Description 61
5.6.2 Design Guidelines 61
IDE bus IDE cable 62
Total Max 62
Length 13 inches 62
Carrier Board 62
5.6.3 Layout Guidelines 63
5.7 Ethernet 64
5.7.1 Signal Descriptions 64
5.7.2 Design Guidelines 64
LAN Connector 65
5.7.3 Layout Guidelines 66
5.7.3.2 Transformer 67
5.7.3.3 Critical Dimensions 68
5.8 TV-Out 70
5.8.1 Signal Descriptions 70
5.8.2 Design Guidelines 70
TV DAC Filter 71
5.9 Miscellaneous 72
Carrier board 74
5.10 PCI Express Bus 77
5.10.1 Signal Description 77
Pin Signal I/O Description 77
5.10.3.1 Differential pairs 81
Guidelines 82
L1 L2 L3 Capacitor Value 83
L1 L2 Capacitor Value 83
5.11 Serial ATA 84
5.11.1 Signal Description 84
5.11.2 Design Guidelines 84
5.11.3 Layout Guidelines 85
5.12 LPC 87
5.12.1 Signal Description 87
5.12.2 Design Guidelines 87
5.12.3 Layout Guidelines 87
5.12.4 Application Notes 88
5.12.4.3 LPT/Floppy 89
5.12.4.4 EMI Considerations 89
Parallel Port 90
6.2 Design Guidelines 95
8.1 Material of Heatsink 101
8.4 Grounding Issues 102
8.8.1 Vendor List 106
8.8.2 Heat-Spreader 106
8.8.3 Heat-Sink 107
8.8.4 Thermal Pad 108
M2.5*6 5 109
M2.5*16 5 109
Quantity 109
8.8.6 Fan 110

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Advantech MMP3-21 Manuale Utente Pagina 96

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