Utility Interface (J5); Keyboard; Mouse; Battery - Ampro CoreModule 420 Reference Manual

Chapter 3

Utility Interface (J5)

The Utility interface consists of the 10-pin, 0.1" header on the module and is used as the interface for
various utility signals. The Super I/O chip drives most of the device interfaces on the Utility interface.
Table 3-15 shows the meaning of the interface signals for the utility interface.
Keyboard and PS/2 Mouse

Battery

Reset Switch

Speaker

Keyboard

The signal lines for an AT or PS/2 keyboard are provided through the Utility interface (J5) to the Super
I/O controller (U13). Refer to Table 3-15 for pin-signal information.

Mouse

The signal lines for a PS/2 mouse are provided through the Utility interface (J5) to the Super I/O
controller (U13). Refer to Table 3-15 for pin-signal information.
Battery
An external battery input connection is provided through the Utility interface (J5) to support a battery
backup for the CMOS RAM and the RTC (Real Time Clock). Refer to Table 3-15 for pin-signal
information.
Reset Switch
An external reset switch provides the reset signal through the Utility interface (J5) to a reset circuit,
which drives the STPC ATLAS CPU (U14). Refer to Table 3-15 for pin-signal information.
Speaker
The speaker signal provides sufficient signal strength to drive a 1W 8
Utility interface (J5) at an audible level. The speaker signal is driven from an on board amplifier and the
STPC ATLAS CPU (U14). Refer to Table 3-15 for pin-signal information.

Table 3-15. Utility Interface Pin/Signal Descriptions (J5)

Pin # Signal
1 SPKR
2 BATV-
3 RESETSW*
4 MDATA
5 KBDATA
6 KBCLK
7 GND
8 KMPWR
9 BATV+
10 MCLK
Notes: The shaded area denotes power or ground. The signals marked with * indicate active low.
36
Description
Speaker Output
Ground return
External Reset Switch signal
Mouse Data input
Keyboard Data input
Keyboard Clock input
Digital Ground
Keyboard /Mouse power (+5V) output
Real time battery voltage (3.6V Type/ 4.0V Max) input
Mouse Clock input
Reference Manual
Hardware
"Beep" speaker through the
CoreModule 420