Ampro Corporation 5001692A manual Utility Interface J5

Chapter 3 Hardware

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 Ω “Beep” speaker through the 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	Description
1	SPKR	Speaker Output
2	BATV-	Ground return
3	RESETSW*	External Reset Switch signal
4	MDATA	Mouse Data input
5	KBDATA	Keyboard Data input
6	KBCLK	Keyboard Clock input
7	GND	Digital Ground
8	KMPWR	Keyboard /Mouse power (+5V) output
9	BATV+	Real time battery voltage (3.6V Type/ 4.0V Max) input
10	MCLK	Mouse Clock input

Notes: The shaded area denotes power or ground. The signals marked with * indicate active low.

36 Reference Manual CoreModule 420