Table 3-18. Utility 2 Interface Pin/Signal Descriptions (J13) - Ampro LittleBoard800 Reference Manual

Chapter 3

Table 3-18. Utility 2 Interface Pin/Signal Descriptions (J13)

Pin # Signal
1 LIDSW
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 USBPWR1
16 USBPWR2
17 USBP1-
18 USBP2-
19 USBP1+
20 USBP2+
21 USBGND1
22 USBGND2
23 SHIELD1
24 SHIELD2
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
48
I/O Description
- 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.
I Power Button – This signal from an external switch to the I/O Hub is
not used with AT Power supplies.
Battery Low – This signal from external battery indicates to the I/O Hub
there is insufficient power to boot the system.
O Not connected (IR Mode select)
O IR Transmit Data – This signal goes to external IrDA Transceiver.
I IR Receive Data – This signal comes from external IrDA Transceiver.
- Ground
- +5 Volts
I/O Mouse Data – Data signal provided to external mouse connector.
I/O Mouse Clock– Clock signal provided to external mouse connector
- Ground
- +5 Volts
- SMBus Clock – Clock signal provided to external devices.
- SMBus Data – Data signal provided to external devices.
- +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 Negative Data Signal
I/O USB 2 Negative Data Signal
I/O USB 1 Positive Data Signal
I/O USB 2 Positive Data Signal
- USB Port ground
- USB Port ground
- USB Port shield (Cable Shield)
- USB Port shield (Cable Shield)
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LittleBoard 800