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Chapter 3
Utility Interface
The Utility interface provides three utility and I/O signals on the module and consists of a 5-pin, 0.100"
(2.54mm), single row header. The US15W SCH drives the signals on the Utility interface.
provides the signal definitions.
•
Power Button
•
Reset Switch
•
Speaker
Power Button
The Utility header provides a signal for an external Power button through pins 1 and 2. The Power button
allows the user to turn Off the system.
Reset Switch
Pins 2 and 3 on the Utility header provide the signal for an external reset button which allows the user to re-
boot the system.
BIOS Recovery (Using Reset Switch)
In the event you have selected BIOS settings that prevent you from booting the system, you can stop the
current BIOS settings in the CMOS from being loaded by pressing and holding the Reset button for five
seconds and then releasing the button. The system re-boots, and the BIOS loads the default settings.
Speaker
The speaker signal provides sufficient signal strength to drive a 1W 8
interface at an audible level. The speaker signal is driven from an on-board amplifier and the SCH.
Table 3-9. Utility Interface Pin Signals (J25)
Pin #
Signal
1
/PWR_BTN
2
GND
3
/RESET SW*
4
5V
5
SPKR_CONN
Note: The shaded area denotes power or ground. The signals marked with * indicate active low.
Miscellaneous
Battery
An external battery connection is provided through the J17 header to support a backup battery for the CMOS
RAM and the RTC (Real Time Clock).
Real Time Clock (RTC)
The CoreModule 730 contains a Real Time Clock (RTC). The CMOS RAM can be backed up with a lithium
battery. If the battery is not present, a battery-free boot option in the BIOS completes the boot process and
resets the clock to the default date and time.
NOTE
Some operating systems require a valid default date and time to function.
CoreModule 730
Description
External Power Button (Pins 1-2)
Ground
External Reset Switch signal (Pins 2-3)
+5 Volts Power
Speaker Output (Pins 4-5)
Reference Manual
Table 3-9
"Beep" speaker through the Utility
Ω
Hardware
23
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