Specifications

Appendix B I/O Interface Board
24 QuickStart Guide LittleBoard 550
Utility 1- J10
Pin # Signal
To Connector & Pin # Description
11 KBDATA J1-A1 Keyboard Data
12 KBCLK J1-A6 Keyboard Clock
13 GND4 GND Keyboard Ground
14 KBD PWR NC Not connected (Keyboard +5V)
15 BATV+ J12-1 Backup Battery
16 BATV- J12-4 Ground
Notes: The shaded area denotes power or ground.
Table B-2. Utility 2 Interface Pin/Signal Descriptions (J8)
Utility 2 –J8
Pin # Signal
To Connector &
Pin #
Description
1 LIDSW NC Not connected – Lid Switch simulator
2 PWRBT# NC Not connected – Power Button switch
3 BATLOW NC Not connected – Battery Low simulator
4 IR_MODE NC Not connected – IR Mode Select
5 IRTX U1-2 IR Transmit Data
6 IRRX U1-3 IR Receive Data
7 GND1 GND Ground
8 VCC1 +5 volt Line +5V
9 MDATA J1-B1 Mouse Data –
10 MCLK J1-B6 Mouse Clock –
11 GND2 GND Ground
12 VCC2 +5 volt Line +5V
13 SMBCLK NC Not connected – SMBus Clock
14 SMBDATA NC Not connected – SMBus Data
15 USB1PWR J14-A1
+5V USB Port Power – Port is disabled if this
input is low.
16 USB2PWR J14-B1
+5V USB Port Power – Port is disabled if this
input is low.
17 USBP1- J14-A2
USB 1 Signal -
18 USBP2- J14-B2
USB 2 Signal -
19 USBP1+ J14-A3
USB 1 Signal +
20 USBP2+ J14-B3
USB 2 Signal +
21 USB1GND J14-A4
USB Port ground
22 USB2GND J14-B4 USB Port ground
23 SHIELD1 J14-5 &6 USB Port shield (Cable Shield)
24 SHIELD2 J14-7 &8
USB Port shield (Cable Shield)
Notes: The shaded area denotes power or ground.