Utility Interface; Power Button; Reset Switch; Speaker - ADLINK Technology CoreModule 720 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 (J22). The E6XXT CPU drives the Power Button and Speaker signals on the Utility
interface. A separate Power Management microprocessor drives the Reset Switch signal.
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 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 signal 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 3-14 describes the pin signals of the Utility interface, which provides a 5-pin, single-row header with
0.100" (2.54mm) pitch.

Table 3-14. Utility Interface Pin Signals (J22)

Pin # Signal
1 PWR_BTN*
2 GND
3 RESET SW*
4 5V
5 SPKR_CONN
Note: The shaded table cells denote power or ground. The * symbol indicates the signal is Active Low.
30
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
Hardware
Table 3-14
"Beep" speaker at an
Ω
CoreModule 720