Lenovo ThinkPad 600E Technical Reference Manual for the ThinkPad 600 - Page 26

Keyboard/Mouse Connector, Signals, Connector, Scan Codes

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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. Scan Codes Figure 2-3 shows the key numbers assigned to keys on the 85-key keyboard (for the U.S.). 2-4 System Board

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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.
Figure
2-1.
Keyboard and Mouse Signals
Sink current
1 mA
Maximum
High-level output voltage
5.0 V dc minus pullup
Minimum
Low-level output voltage
0.5 V dc
Maximum
High-level input voltage
2.0 V dc
Minimum
Low-level input voltage
0.8 V dc
Maximum
Connector
The keyboard/mouse connector uses a 6-pin, miniature DIN
connector.
1
2
3
4
5
6
Figure
2-2.
Keyboard/Mouse Connector Pin Assignments
Pin
I/O
Signal Name
1
I/O
Mouse Data
2
I/O
Keyboard Data
3
–
Ground
4
–
+5 V dc
5
I/O
Mouse Clock
6
I/O
Keyboard Clock
Note:
The maximum current for +5 V dc (pin 4) is 0.5 A.
Scan Codes
Figure 2-3 shows the key numbers assigned to keys on the 85-key
keyboard (for the U.S.).
2-4
System Board