Typical Application Circuit Diagram - I.C. Top View
The PS/2 Switch Input Mouse Controller is Microsoft Wheel Mouse compatible
and can work with standard Microsoft Mouse Drivers or with the Wheel Mouse
Drivers if you have them. It uses switches to control mouse cursor movement
instead of the usual optical encoder inputs. This makes it easy to use the
controller to build special devices to enable handicapped or disabled people
to control their computer mouse functions. It is also easy to use it to
build special mouse controllers for use in computer applications where a
standard mouse would not work such as industrial environments.
The switch inputs provide: UP, DOWN, LEFT and RIGHT mouse cursor movement
and LEFT BUTTON DOUBLE-CLICK, LEFT BUTTON, RIGHT BUTTON, MIDDLE BUTTON,
DRAG-N-DROP and FAST/SLOW. The cursor movement inputs provide
accelerating motion when held active and also have a single pixel move mode
when clicked. This provides for fine pixel level positioning. The FAST/SLOW
input, pin 11, selects a fast or slow click time, speed and acceleration
rate. In FAST the cursor typically can cross the screen in 2.5 seconds. In
SLOW its typically 5 to 6 seconds.
The DRAG-N-DROP input effectively locks down the left button for a drag
operation. Activating any button input or the DRAG-N-DROP input a second
time releases the left button and ends the drag operation. The optional LED
(Light Emitting Diode) shown in the DRAG-N-DROP pull-up lights during the
drag and drop operation.
The Z-AXIS SELECT switch functions in Wheel Mouse (3D) mode to switch the
Y-Axis, UP and DOWN, inputs to control the Z-Axis. Z-Axis functions depend
on system settings and the particular applications that use the data. It is
often used to control scroll bars or for IN and OUT movement in 3D
The switches are wired with a common negative (pull down to activate).
External circuitry can also be used in place of switches so the mouse
controller can be controlled by another device (i.e. another
microcontroller, photosensors etc...). Note that the DRAG-N-DROP pin 10 is
both an input and an output. When interfacing pin 10 to external circuitry
there should be no active pull-up. The I.C. is available in a version
without the LED option so pin 10 is always an input and active high
circuitry can used. Otherwise a open collector can be used for interface.
A head mouse can be built with the controller I.C. and some tilt switches.
The price of the PS/2 Switch Mouse Controller I.C. is $20.00.
Quantity pricing is available.