Ampro Corporation LITTLE BOARD P5X - Manual (Page 69)

Little Board/P5x Technical Manual
2–51
Utility Connectors (J16, J24)
Seven functions appear on Utility 1, a 16-pin connector at J16. These are:
! Auxiliary power connections
! Power indicator LED
! PC speaker
! Push-button reset switch
! Keyboard interface
! External back-up battery
Table 2– 38 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– 39 shows
manufacturer’s part numbers for both types of mating connectors.
Table 2– 38. Utility Connector (J16)
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 RSVD No connection
7 Speaker + PC audio signal output
8 Ground Ground
9 Reset To one side of manual reset button.
10 N/C Reserved
11 Kbd Data Keyboard serial data
12 Kbd Clk Keyboard clock
13 Ground Keyboard ground
14 Kbd Power Keyboard +5V power
15 + Bat + Battery *
16 Ground - Battery *
* An external battery is not required.