Specifications

Hardware Configuration
2–43
! Security key switch
! Keyboard interface
! External back-up battery
Table 2-32 shows the pinout and signal definitions of the Utility Connector. Since there are
connections for diverse features on this single connector, you would usually choose a discrete-wire
connector rather than a ribbon cable connector, though this is not a requirement. Table 2-33 shows
manufacturer’s part numbers for both types of mating connectors.
Pin Signal Name Function
1 -12V power Connect external -12V supply here for distribution to
expansion cards needing this voltage.
2 Ground Ground return
3 -5V power Connect external -5V supply here for distribution to
expansion cards needing this voltage.
4 Ground Ground return
5 LED Anode LED current source (+5V through 330 ohms)
6 KEY No connection. Use for keying the connector.
7 Speaker + PC audio signal output
8 Ground Ground
9 Reset To one side of manual reset button.
10 Kbd SW To one side of the keyboard security switch.
11 Kbd Data Keyboard serial data
12 Kbd Clk Keyboard clock
13 Ground Keyboard ground
14 Kbd Power Keyboard +5V power
15 BATV+ External battery +
16 BATV- External battery -
Table 2-32 Utility Connector (J16)
Connector Type Mating Connector
RIBBON 3M 3452-7600
DISCRETE WIRE MOLEX Housing 22-55-2162
Pin 16-02-0103
Table 2-33 J16 Mating Connector