Advantech MI/O-128 Guide

1
MI/O-128™Single Board Computer
Design Guide
V1.0
June 2018

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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

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Figure 1-2 DIP 64-Pin Connector Symbol
Pin
Name
Pin
Name
1
12V Input
2
GND
3
12V Input
4
GND
5
12V Input
6
GND
7
12V Input
8
GND
9
GND
10
GND
11
GND
12
GND
13
Inverter 5V Output
14
GND
15
Inverter ENBKL
16
Inverter VBR
17
Inverter 12V Output
18
GND
19
GND
20
GND
21
GND
22
GND
23
VGA DDC DAT
24
VGA DDC CLK
25
VGA RGB GND
26
VGA RGB GND
27
VGA Red
28
VGA Green
29
VGA Blue
30
VGA RGB GND
31
VGA GND
32
VGA 5V Output
33
VGA HSYNC
34
VGA VSYNC
35
GND
36
GND
37
GND
38
GND
39
USB 5V Output
40
USB 5V Output
41
USB0 D-
42
USB1 D-

4
43
USB0 D+
44
USB1 D+
45
GND
46
GND
47
USB Chassis GND
48
NC
49
GND
50
GND
51
LAN LINK100 LED-
52
LAN LINK1000 LED-
53
LAN ACT LED+
54
LAN ACT LED-
55
LAN BI_DA+
56
LAN BI_DA-
57
LAN BI_DB+
58
LAN BI_DB-
59
LAN BI_DC+
60
LAN BI_DC-
61
LAN BI_DD+
62
LAN BI_DD-
63
LAN Chassis GND
64
LAN Chassis GND
Table 1-1 Pin Description of DIP 64-Pin Connector

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Figure 1-3 SMD 64-Pin Connector Symbol
Pin
Name
Pin
Name
1
Power Button Pin1
2
Power LED+
3
Power Button Pin2
4
Power LED-
5
Reset Button Pin1
6
HDD LED+
7
Reset Button Pin2
8
HDD LED-
9
GND
10
SMB 5V Output
11
SMB DAT
12
SMB CLK
13
I2C DAT
14
I2C CLK
15
GPIO 5VSB Output
16
GPIO4
17
GPIO0
18
GPIO5
19
GPIO1
20
GPIO6
21
GPIO2
22
GPIO7
23
GPIO3
24
GND
25
USB 5V Output
26
USB 5V Output
27
USB0 D-
28
USB1 D-
29
USB0 D+
30
USB1 D+
31
GND
32
GND
33
USB Chassis GND
34
NC
35
AUDIO LOUTR
36
AUDIO LINR
37
AUDIO GND
38
AUDIO GND
39
AUDIO LOUTL
40
AUDIO LINL
41
AUDIO GND
42
AUDIO GND
43
AUDIO MICR
44
AUDIO MICL

6
45
COM1
422TX-/485D-/DCD#
46
COM1 DSR#
47
COM1 422TX+/485D+/RXD
48
COM1 RTS#
49
COM1 422RX+/TXD
50
COM1 CTS#
51
COM1 422RX-/DTR#
52
COM1 RI#
53
GND
54
GND
55
COM2
422TX-/485D-/DCD#
56
COM2 DSR#
57
COM2 422TX+/485D+/RXD
58
COM2 RTS#
59
COM2 422RX+/TXD
60
COM2 CTS#
61
COM2 422RX-/DTR#
62
COM2 RI#
63
GND
64
GND
Table 1-2 Pin Description of SMD 64-Pin Connector

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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
Pin
Name
Pin Type
Power Rail
Description
35
AUDIO LOUTR
Output
1.2Vrms
LINE-R Output
37
AUDIO GND
Audio GND
Audio GND
Audio GND
39
AUDIO LOUTL
Output
1.2Vrms
LINE-L Output
41
AUDIO GND
Audio GND
Audio GND
Audio GND
43
AUDIO MICR
Input
1.5Vrms
MIC-R Input
36
AUDIO LINR
Input
1.5Vrms
LINE-R Input
38
AUDIO GND
Audio GND
Audio GND
Audio GND
40
AUDIO LINL
Input
1.5Vrms
LINE-L Input
42
AUDIO GND
Audio GND
Audio GND
Audio GND
Table 1.1.1-1 Signal Description for Audio

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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
<Characteristic>
JACK5P-φ3.5
5
4
3
2
1
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
5
4
3
2
1
AGND GND_ChasisAGND
LOUTL
LOUTR
C40
1000pF
50V
0402
C41
1000pF
50V
0402
B40 600_100MHz
0.5A0603
B41 600_100MHz
0.5A0603
AGND
AGND
GND_Chasis
Line Out
Lime
CN28
JACK_5H
5
4
3
2
1

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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
Pin
Name
Pin Type
Power Rail
Description
23
VGA DDC DAT
I/O
5V
VGA DDC Data
25
VGA RGB GND
Analog GND
Analog GND
VGA RGB Ground
27
VGA Red
Output
0.7Vp-p
Red Analog Video
Output
29
VGA Blue
Output
0.7Vp-p
Blue Analog Video
Output
31
VGA GND
GND
GND
GND
33
VGA HSYNC
Output
3.3V
VGA Hsync Output
24
VGA DDC CLK
I/O
5V
VGA DDC Clock
26
VGA RGB GND
GND
Analog GND
VGA RGB Ground
28
VGA Green
Output
0.7Vp-p
Green Analog Video
Output
30
VGA RGB GND
GND
Analog GND
VGA RGB Ground
32
VGA 5V Output
Power Output
5V
Power output for VGA
(500mA)
34
VGA VSYNC
Output
3.3V
VGA Vsync Output
Table 1.2.1-1 Signal Description for VGA

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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
C7
100pF
50V
0402
C8
10pF
50V
0402
C9
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
GND_Chasis
CPU
Board
I/O Board
CN
D3 MBRX120-TP
1A
SOD-123
1 2
PS1 SPR-P150
1.5A 0805 B4 120_100MHz 2A0603
+V5_VGA
C4
10pF
50V
0402
B3 47_100MHz
0.3A
B2 47_100MHz
0.3A
B1 47_100MHz
0.3A
+V3.3
VGA_z_B
M1
0.1uF
16V
0402
VGA_z_R
VGA_z_G
VGA_z_R
VGA_z_B
D1
AZC099-04S.R7G
5.5A
SOT-23-6
1
2
3 4
6
5
C2
10pF
50V
0402
C1
10pF
50V
0402
VGA_R
VGA_B
C3
10pF
50V
0402
VGA_G
C5
10pF
50V
0402
C6
10pF
50V
0402
VGA_z_G
CN1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
+V5_VGA
VGA_y_VS
M2
0.1uF
16V
0402
VGA_y_HS
D2
AZC099-04S.R7G
5.5A
SOT-23-6
1
2
3 4
6
5
VGA_y_DCLKVGA_y_DDAT
RA3
150
1%
0402
RA2
150
1%
0402
RA1
150
1%
0402
GND_Chasis