Specifications

Chapter 3 Hardware
LittleBoard 800 Reference Manual 29
Note: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
Table 3-9. Utility 2 Interface Pin/Signal Descriptions (J13)
Pin # Signal I/O Description
1 LIDSW - Lid Switch – This signal (Suspend Status on I/O Hub) is asserted by the
I/O Hub to indicate the system will be entering a low power state soon.
This signal is not shared with other devices on the LittleBoard. This
signal is similar to the Lid Switch on laptop computer.
2 PWRBT* I Power Button – This signal from an external switch to the I/O Hub is not
used with AT Power supplies.
3 BATLOW* I Battery Low – This signal from external battery indicates to the I/O Hub
there is insufficient power to boot the system.
4 NC O Not connected (IR Mode select)
5 IRTX O IR Transmit Data – This signal goes to external IrDA Transceiver.
6 IRRX I IR Receive Data – This signal comes from external IrDA Transceiver.
7
GND - Ground
8
VCC - +5 Volts
9 MDATA I/O Mouse Data – Data signal provided to external mouse connector.
10 MCLK I/O Mouse Clock– Clock signal provided to external mouse connector
11
GND - Ground
12
VCC - +5 Volts
13 SMBCLK - SMBus Clock – Clock signal provided to external devices.
14 SMBDATA - SMBus Data – Data signal provided to external devices.
15
USBPWR1 - +5V USB Port Power – Port is disabled if this input is low.
16
USBPWR2 - +5V USB Port Power – Port is disabled if this input is low.
17 USBP1- I/O USB 1 Negative Data Signal
18 USBP2- I/O USB 2 Negative Data Signal
19 USBP1+ I/O USB 1 Positive Data Signal
20 USBP2+ I/O USB 2 Positive Data Signal
21
USBGND1 - USB Port ground
22
USBGND2 - USB Port ground
23 NC - Not Connected - Reserved
24 NC - Not Connected - Reserved