Chapter 3 | Hardware |
Utility Interface (J5)
The Utility interface consists of the
•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
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
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
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
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
Table
Pin # | Signal | Description |
1 | SPKR | Speaker Output |
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2 | BATV- | Ground return |
3 | RESETSW* | External Reset Switch signal |
4 | MDATA | Mouse Data input |
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5 | KBDATA | Keyboard Data input |
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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 |
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Notes: The shaded area denotes power or ground. The signals marked with * indicate active low.
36 | Reference Manual | CoreModule 420 |
