Advantech SOM-Express Design Guide
Chapter 2 SOM-Express Overview 27
2.5.1.2 Universal Serial Bus (USB)
Table 2.17 DC specification of USB signals
Symbol Parameter Min Max Unit Note
V
bus
High-power port supply voltage 4.75 5.25 V
V
bus
Low-power port supply voltage 4.75 5.25 V
V
IL
Input Low Voltage - 0.8 V
V
IH
Input High Voltage(driven) 2.0 - V
V
IHZ
Input High Voltage(floating) 2.7 3.6 V
V
OL
Output Low Voltage 0 0.3 V
V
OH
Output High Voltage 2.8 3.6 V
2.5.1.3 Audio
Table 2.18 AC’97 CODEC DC specification
Symbol Parameter Min Max Unit Note
Dvdd
Digital supply voltage Dvdd+5% Dvdd+5% V
Avdd
Analog supply voltage 4.75 5.25 V
Vil
Input Low Voltage - 0.35Vdd V
Vih
Input High Voltage 0.65Vdd - V
*1. Dvdd=5V or 3.3V
Table 2.19 AC’97 CODEC analog I/O DC specification
Symbol Parameter Min Typ Max Unit Note
AUXAL/R
Full scale input voltage - 1.0 - Vrms
MIC
Full scale input voltage - 0.1 - Vrms
SNDL/R
Full scale output voltage - 1.0 - Vrms
2.5.1.4 VGA
Table 2.20 Hsync and Vsync signals specification
Symbol Parameter Min Max Unit Note
V
IL
Input Low Voltage 0 0.5 V
V
IH
Input High Voltage 2.4 5.5 V
V
OL
Output Low Voltage - 0.8 V
V
OH
Output High Voltage 2.0 - V
Table 2.21 RGB Voltage
Symbol Parameter Min Max Unit Note
R
Red analog video output signal
Max. luminance voltage
0.665 0.77 V
G
Green analog video output signal
Max. luminance voltage
0.665 0.77 V
B
Blue analog video output signal
Max. luminance voltage
0.665 0.77 V
R
Red analog video output signal
min. luminance voltage
0 (Typical)
V
G
Green analog video output signal
min. luminance voltage
0 (Typical)
V
B
Blue analog video output signal
min. luminance voltage
0 (Typical)
V
