Utility Interface; Power Button; Reset Switch; Speaker - ADLINK Technology CoreModule 920 Reference Manual

Chapter 3

Utility Interface

The Utility interface provides three I/O signals on the module and consists of a 5-pin, 0.100" (2.54mm),
single-row header (J21). The CPU drives the Power Button and Speaker signals on the Utility interface. A
separate Power Management microprocessor drives the Reset Switch 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 shut down and power on the system. To shut down the system, press and hold the Power
Button for four seconds. Press the Power Button for one second to power on the system.
Reset Switch
Pins 2 and 3 on the Utility header provide the signals for an external reset button, which allows the user to
re-boot the system.
Speaker
The speaker signal provides sufficient signal strength to drive an external 1W 8
audible level through pins 4 and 5 on the Utility header. The speaker signal is driven from an on-board
amplifier and the CPU.
Table 3-15 describes the pin signals of the Utility interface, which provides a 5-pin, single-row header with
0.100" (2.54mm) pitch.
Table 3-15. Utility Interface Pin Signals (J21)
Pin # Signal
1 PWR_BTN*
2 GND
3 RESET SW*
4 5V
5 SPKR_CONN
6 GND
Note: The shaded table cells denote power or ground. The * symbol indicates the signal is Active Low.

System Fan

Table 3-16 lists the pin signals of the System Fan header, which provides a single row of 3 pins with 0.079"
(2mm) pitch.
Table 3-16. System Fan Pin Signals (J22)
Pin # Signal
1 +V_FAN
2 NC
3 GND
Note: The shaded table cells denote power or ground.
CoreModule 920
Description
External Power Button (Pins 1-2)
Ground
External Reset Switch signal (Pins 2-3)
+5 Volts Power
Speaker Output (Pins 4-5)
Ground
Description
+5.0 volts DC +/- 5%
Not Connected
Ground
Reference Manual
Hardware
Table 3-15 provides the signal
"Beep" speaker at an
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