Lenovo ThinkPad 770X Technical Reference Manual for the ThinkPad 770 - Page 26
Keyboard/Mouse Connector, Signals, Connector
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Keyboard/Mouse Connector Each ThinkPad computer has a keyboard/mouse connector, where the IBM mouse, keyboard, or numeric keypad is connected. Signals The keyboard and mouse signals are driven by open-collector drivers pulled to 5 V dc through a pull-up resistor. Figure 2-1 lists the signals. Sink current High-level output voltage Low-level output voltage High-level input voltage Low-level input voltage 1 mA 5.0 V dc minus pullup 0.5 V dc 2.0 V dc 0.8 V dc Maximum Minimum Maximum Minimum Maximum Figure 2-1. Keyboard and Mouse Signals Connector The keyboard/mouse connector uses a 6-pin, miniature DIN connector. 6 5 4 3 21 Pin I/O 1 I/O 2 I/O 3 - 4 - 5 I/O 6 I/O Signal Name Mouse Data Keyboard Data Ground +5 V dc Mouse Clock Keyboard Clock Figure 2-2. Keyboard/Mouse Connector Pin Assignments Note: The maximum current for +5 V dc (pin 4) is 0.5 A for both the mouse and the numeric keypad. 2-4 System Board
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