Ampro Corporation Single Board Computer Littleboard 550 User Manual
Page 56
Chapter 3
Hardware
50
Reference Manual
LittleBoard 550
Table 3-18. Utility 2 Interface Pin/Signal Descriptions (J24)
Pin #
Signal
I/O
Description
1
SUSC*
-
Lid Switch
2
PWRBT*
I
Power Button
3
BATLOW*
I-
Low Battery
4
NC
O
Not Connected (IR Mode Select)
5
Reserved
O
Reserved (IrDA Transmit)
6
Reserved
I
Reserved (IrDA Receive)
7
GND
-
Ground
8
VCC
-
+5 volts
9
MDATA
I/O
Mouse Data
10
MCLK
I/O
Mouse Clock
11
GND
-
Ground
12
VCC
-
+5 volts
13
SMBCLK
-
SMBus Clock
14
SMBDATA
-
SMBus Data
15
USB1PWR
-
+5V USB 1 Port Power – Port is disabled if this input is low.
16
USB2PWR
-
+5V USB 2 Port Power – Port is disabled if this input is low.
17
USBP1-
I/O
Universal Serial Bus Port 1 Data Negative
18
USBP2-
I/O
Universal Serial Bus Port 2 Data Negative
19
USBP1+
I/O
Universal Serial Bus Port 1 Data Positive
20
USBP2+
I/O
Universal Serial Bus Port 2 Data Positive
21
USB1GND
-
USB 1 Port ground
22
USB2GND
-
USB 2 Port ground
23
SHIELD1
-
USB 1 Port shield (Cable Shield)
24
SHIELD2
-
USB 2 Port shield (Cable Shield)
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.