Advantech MI/O-128 Guida

MI/O-128™Single Board Computer

Design Guide

V1.0

June 2018

Chap. 1 I/O 128 Pin

MIO series feature two 64-pin connectors, which one is DIP type and another is SMD

type, for I/O extension, refer to Figure 1-1. This interface, including power input,

inverter output, VGA, USB 2.0, GPIO and RS-232, can implement low speed functions

directly. This chapter will show all the pin description.

Figure 1-1 DIP 64-Pin Connector A & SMD 64-Pin Connector B

Figure 1-2 DIP 64-Pin Connector Symbol

Name

12V Input

GND

12V Input

GND

12V Input

GND

12V Input

GND

Inverter 5V Output

GND

Inverter ENBKL

Inverter VBR

Inverter 12V Output

GND

VGA DDC DAT

VGA DDC CLK

VGA RGB GND

VGA Red

VGA Green

VGA Blue

VGA RGB GND

VGA GND

VGA 5V Output

VGA HSYNC

VGA VSYNC

GND

USB 5V Output

USB0 D-

USB1 D-

USB0 D+

USB1 D+

GND

USB Chassis GND

GND

LAN LINK100 LED-

LAN LINK1000 LED-

LAN ACT LED+

LAN ACT LED-

LAN BI_DA+

LAN BI_DA-

LAN BI_DB+

LAN BI_DB-

LAN BI_DC+

LAN BI_DC-

LAN BI_DD+

LAN BI_DD-

LAN Chassis GND

Table 1-1 Pin Description of DIP 64-Pin Connector

Figure 1-3 SMD 64-Pin Connector Symbol

Name

Power Button Pin1

Power LED+

Power Button Pin2

Power LED-

Reset Button Pin1

HDD LED+

Reset Button Pin2

HDD LED-

GND

SMB 5V Output

SMB DAT

SMB CLK

I2C DAT

I2C CLK

GPIO 5VSB Output

GPIO4

GPIO0

GPIO5

GPIO1

GPIO6

GPIO2

GPIO7

GPIO3

GND

USB 5V Output

USB0 D-

USB1 D-

USB0 D+

USB1 D+

GND

USB Chassis GND

AUDIO LOUTR

AUDIO LINR

AUDIO GND

AUDIO LOUTL

AUDIO LINL

AUDIO GND

AUDIO MICR

AUDIO MICL

COM1

422TX-/485D-/DCD#

COM1 DSR#

COM1 422TX+/485D+/RXD

COM1 RTS#

COM1 422RX+/TXD

COM1 CTS#

COM1 422RX-/DTR#

COM1 RI#

GND

COM2

422TX-/485D-/DCD#

COM2 DSR#

COM2 422TX+/485D+/RXD

COM2 RTS#

COM2 422RX+/TXD

COM2 CTS#

COM2 422RX-/DTR#

COM2 RI#

GND

Table 1-2 Pin Description of SMD 64-Pin Connector

1.1 Audio

The HD Audio, which can provide DAC channels to support LOUT and stereo ADCs to

support stereo MIC and LIN, is established on the CPU board. The audio signal MICL,

MICR, LINL, LINR, LOUTL, LOUTR and AGND are the interface for audio application.

1.1.1 Signal Description

SMD

Name

Pin Type

Power Rail

Description

AUDIO LOUTR

Output

1.2Vrms

LINE-R Output

AUDIO GND

Audio GND

AUDIO LOUTL

Output

1.2Vrms

LINE-L Output

AUDIO GND

Audio GND

AUDIO MICR

Input

1.5Vrms

MIC-R Input

AUDIO LINR

Input

1.5Vrms

LINE-R Input

AUDIO GND

Audio GND

AUDIO LINL

Input

1.5Vrms

LINE-L Input

AUDIO GND

Audio GND

Table 1.1.1-1 Signal Description for Audio

1.1.2 Schematic Guidelines

AGND is clear analog ground for audio, and all the audio signals should refer to it in

CPU board. What’s more, one 0 ohm resistor for the return path connects the signal

GDN with the audio AGND in CPU board. Considering EMI, the bead and capacitors

are the recommendatory solution. For placement concern, EMI solution should be

close to connector.

Figure 1.1.1-1 Audio Application

I/O Board

EMI Solution

R1 05%

0603

GND

AGND

CNCPU Board

AGND

Pink

CN26

JACK_5H

JACK5P-φ3.5

MICL

MICR

C60

1000pF

50V

0402

C209

1000pF

50V

0402

B50 600_100MHz

0.5A0603

B51 600_100MHz

0.5A0603

MIC in

AGNDAGND GND_Chasis

Line in

LINL

LINR

C38

1000pF

50V

0402

C39

1000pF

50V

0402

B38 600_100MHz

0.5A0603

B39 600_100MHz

0.5A0603

Blue

CN27

JACK_5H

Line in

JACK5P-φ3.5

AGND GND_ChasisAGND

LOUTL

LOUTR

C40

1000pF

50V

0402

C41

1000pF

50V

0402

B40 600_100MHz

0.5A0603

B41 600_100MHz

0.5A0603

AGND

GND_Chasis

Line Out

Lime

CN28

JACK_5H

1.2 VGA

This interface can support one VGA port for display, and is compatible with WESA. As

for the detail, users need to confirm CPU board manual first because the real

specifications are based on chipsets.

1.2.1 Signal Descriptions

DIP

Name

Pin Type

Power Rail

Description

VGA DDC DAT

I/O

VGA DDC Data

VGA RGB GND

Analog GND

VGA RGB Ground

VGA Red

Output

0.7Vp-p

Red Analog Video

Output

VGA Blue

Output

0.7Vp-p

Blue Analog Video

Output

VGA GND

GND

VGA HSYNC

Output

3.3V

VGA Hsync Output

VGA DDC CLK

I/O

VGA DDC Clock

VGA RGB GND

GND

Analog GND

VGA RGB Ground

VGA Green

Output

0.7Vp-p

Green Analog Video

Output

VGA RGB GND

GND

Analog GND

VGA RGB Ground

VGA 5V Output

Power Output

Power output for VGA

(500mA)

VGA VSYNC

Output

3.3V

VGA Vsync Output

Table 1.2.1-1 Signal Description for VGA

1.2.2 Schematic Guidelines

Each RGB output (RED, GREEN, and BLUE) is terminated with one 150-Ω resistor near

the chipset from the DAC output to the board ground. A second 150Ω resistor should

be placed close to the CRT connector. Additionally, one 75-Ω termination resistor

exists within the display. The equivalent DC resistance at the output of each DAC is

37.5 Ω. The current output from each DAC flows into this equivalent resistive load to

produce a video voltage without the need for external buffering. There is also a

pi-filter on each channel that is used to reduce high-frequency noise and to reduce

EMI. In order to maximize the performance, the filter impedance, cable impedance,

and load impedance should be matched.

The host VGA controller in CPU board is weak device without strong ESD protection,

and therefore ESD and EMI solutions close to connector are must for VGA port.

Figure 1.2.1-1 Demonstration for VGA Application

100pF

50V

0402

10pF

50V

0402

10pF

50V

0402

VGA_y_DDAT

VGA_y_VS

VGA_y_HS

VGA_y_DCLK

C10

100pF

50V

0402

B5 600_100MHz

0.3A0402

R1 05%

0402

R2 05%

0402

B6 600_100MHz

0.3A0402

VGA_DDC_DAT

VGA_VS

VGA_HS

VGA_DDC_CLK

GND_Chasis

CPU

Board

I/O Board

D3 MBRX120-TP

SOD-123

1 2

PS1 SPR-P150

1.5A 0805 B4 120_100MHz

2A0603

+V5_VGA

10pF

50V

0402

B3 47_100MHz

0.3A

B2 47_100MHz

0.3A

B1 47_100MHz

0.3A

+V3.3

VGA_z_B

0.1uF

16V

0402

VGA_z_R

VGA_z_G

VGA_z_R

VGA_z_B

AZC099-04S.R7G

5.5A

SOT-23-6

3 4

10pF

50V

0402

10pF

50V

0402

VGA_R

VGA_B

10pF

50V

0402

VGA_G

10pF

50V

0402

10pF

50V

0402

VGA_z_G

CN1

+V5_VGA

VGA_y_VS

0.1uF

16V

0402

VGA_y_HS

AZC099-04S.R7G

5.5A

SOT-23-6

3 4

VGA_y_DCLKVGA_y_DDAT

RA3

150

0402

RA2

150

0402

RA1

150

0402

GND_Chasis

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