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Chapter 3
Hardware
LittleBoard 700
Reference Manual
45
Speaker
The signal lines for a speaker port with 0.1-watt drive are provided through a Utility 1 interface (J16).
Table 3-16. Utility 1 Interface Pin/Signal Descriptions (J16)
Pin #
Signal
I/O
Description
1
-12
I
-12 Volts
2
GND
I
Ground
3
-5V
I
-5 Volts
4
GND
I
Ground
5
NU
O
Not used (Power On LED)
6
NC
-
Reserved
7
SPKR+
O
S Output
8
GND
I
Ground
9
RSTSW*
I
Reset Switch
10
NC
-
Not connected
11
KBDATA
I/O
Keyboard Data
12
KBCLK
I/O
Keyboard Clock
13
GND
I
Keyboard Ground
14
KBD PWR
O
+5V for Keyboard
15
BATV+
I
Backup Battery
16
GND
I
Ground
Notes:
The shaded area denotes power or ground. The signals marked with * = Negative true logic.
Utility 2 Interface (J24)
The Utility 2 interface consists of a 24-pin connector used to interface various signals to the external
board with external connections, or directly to the respective connector such as, the mouse, infrared (IR),
etc. Table 3-19 gives the pin outs and interface signals for Utility 2 interface.
•
PS/2 Mouse signals
•
Infrared (IrDA) signals
•
SMBus signals
•
USB signals for USB ports 1 and 2
•
Power button signal
Mouse Interface
The signal lines for a PS/2 mouse are provided through the Utility interface (J24).
System Management Bus (SMBus)
The southbridge chip, VT82C686B, contains both a host and slave SMBus port; but the host cannot
access the slave internally. The slave port allows an external master access to the southbridge through
the connector (J24). The master contained in the VT82C686B is used to communicate with the SEEP,
SDRAM EPROM, MAX1617, and the clock generator. Table 3-17 gives the addresses for these devices
with the components and corresponding binary addresses of the SMBus.
Summary of Contents for Little Board 700
Page 1: ...Little Board 700 Single Board Computer Reference Manual P N 5001670A Revision D...
Page 6: ...Contents vi Reference Manual LittleBoard 700...
Page 10: ...Chapter 1 About This Manual 4 Reference Manual LittleBoard 700...
Page 26: ...Chapter 2 Product Overview 20 Reference Manual LittleBoard 700...
Page 82: ...Chapter 4 BIOS Setup 76 Reference Manual LittleBoard 700...
Page 84: ...Appendix A Technical Support 78 Reference Manual LittleBoard 700...
Page 86: ...Appendix B Connector Part Numbers 80 Reference Manual LittleBoard 700...
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