Advantech SOM-Express Design Guide
28 Chapter 2 SOM-Express Overview
2.5.1.5 LCD
Table 2.22 LCD I/O Voltage
Symbol Parameter Min Max Unit Note
V
IL
Input Low Voltage -0.5 0.8 V
V
IH
Input High Voltage 2.0 Vcc+0.5 V
V
OL
Output Low Voltage - 0.55 V Iol=4.0mA
V
OH
Output High Voltage 2.4 - V Ioh=-1.0mA
2.5.1.6 IDE
Table 2.23 Ultra DMA modes 1-4 (5V)
Symbol Parameter Min Max Unit Note
V
IH
Input High Voltage - 5.5 V
V
OL
Output Low Voltage - 0 V
V
OH
Output High Voltage 2 - V
Table 2.24 Ultra DMA modes 5 (3.3V)
Symbol Parameter Min Max Unit Note
V
dd3
DC supply voltage to drivers and
receivers
3.3-8% 3.3+8% V
V+
Low to High input threshold 1.5 2.0 V
V
-
High to Low input threshold 1.0 1.5 V
2.5.1.7 Ethernet
Table 2.25 Ethernet I/O Voltage
Symbol Parameter Min Max Unit Note
V
IL
Input Low Voltage -0.5 0.3Vcc V *1
V
IH
Input High Voltage 0.5Vcc Vcc+0.5 V
V
OL
Ouput Low Voltage - 0.1Vcc
V
OH
Output High Voltage 0.9Vcc Vcc
*1. Vcc=3.0V min. to 3.6V max.
2.5.1.8 TV-Out Bus
Table 2.26 TV-Out I/O Voltage
Symbol Parameter Min Max Unit Note
V
O
Output Voltage 1.28 1.28 V Typical=1.8
V
IH
Input High Voltage 0 1.4 V
2.5.1.9 IrDA
Table 2.27 IrDA I/O Voltage
Symbol Parameter Min Max Unit Note
V
IL
Input Low Voltage -0.5 0.8 V
V
IH
Input High Voltage 2.0 VCC+0.5 V
V
OL
Output Low Voltage - 0.4 V
Voh Output High Voltage 2.4 - V
I
Ldtx
Input Load Current (IRTX Signal) - 6 mA 0 Vin Vcc≦≦
ILd Input Load Current (all signal
except IRTX)
- 1.5 mA 0 Vin Vcc≦≦
