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Chapter 3
Table 3-18. Utility 2 Interface Pin/Signal Descriptions (J24)
Pin #
Signal
1
NC
2
PWRBT*
3
BATLOW*
4
NC
5
IRTX
6
IRRX
7
GND
8
VCC
9
MDATA
10
MCLK
11
GND
12
VCC
13
SMBCLK
14
SMBDATA
15
USB1PWR
16
USB2PWR
17
USBP1-
18
USBP2-
19
USBP1+
20
USBP2+
21
USB1GND
22
USB2GND
23
SHIELD1
24
SHIELD2
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
LittleBoard 700
I/O
Description
-
NC
I
Power Button
I-
Low Battery
O
Not Connected (IR Mode Select)
O
IR Transmit Data
I
IR Receive Data
-
Ground
-
+5V
I/O
Mouse Data
I/O
Mouse Clock
-
Ground
-
+5V
-
SMBus Clock
-
SMBus Data
-
+5V USB Port Power – Port is disabled if this input is low.
-
+5V USB Port Power – Port is disabled if this input is low.
I/O
USB 1 Signal -
I/O
USB 2 Signal -
I/O
USB 1 Signal +
I/O
USB 2 Signal +
-
USB Port ground
USB Port ground
-
USB Port shield (Cable Shield)
-
-
USB Port shield (Cable Shield)
Reference Manual
Hardware
47
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