IEI Integration ICE-DB-9S - Manual (Page 92)

Page 79
ICE Module
+V5
UART_TX2
UART_RX2
IR CONNECTOR
IR1
IR_5X1_2.54
1
3
4
5
2
C260
0.1U_4_Y_16V
Figure 4-40: IR Reference Schematic
4.13 VGA
COM Express provides analog display signals. There are three signals -- red, green,
and blue -- that send color information to a VGA monitor. These three signals each
drive an electron gun that emits electrons which paint one primary color at a point on
the monitor screen. Analog levels between 0 (completely dark) and 0.7 V (maximum
brightness) on these control lines tell the monitor what intensities of these three
primary colors to combine to make the color of a dot (or pixel) on the monitor’s screen.
4.13.1 Signal Description
Table 4-23 shows COM Express VGA signals, including pin number, signals, I/0,
power plane, terminal resistors, damping resistors and descriptions.
Table 4-23: VGA signals description
Pin D-SUB15 Signal I/O Description
B89 1 VGA_RED O Analog Red component of analog DAC monitor
output, designed to drive a 37.5Ω equivalent
load.
B91 2 VGA_GRN O Analog Green component of analog DAC monitor
output, designed to drive a 37.5Ω equivalent
load.
B92 3 VGA_BLU O Analog Blue component of analog DAC monitor
output, designed to drive a 37.5Ω equivalent
load.
B93 13 VGA_HSYNC O 3.3V
CMOS Horizontal sync output to VGA monitor.
B94 14 VGA_VSYNC O 3.3V
CMOS
Vertical sync output to VGA monitor.
B95 15 VGA_I2C_CK I/O 3.3V
CMOS DDC clock line (I2C port dedicated to
identify VGA monitor capabilities). DDC data
line.
B96 VGA_I2C_DAT I/O 3.3V
CMOS
DDC clock line (I2C port dedicated to
identify VGA monitor capabilities). DDC data