UR7HCMTB

The UR7HCMTB TrackCoder^TM is a low-power, single-chip mouse and trackball encoder that interfaces a trackball/mouse photodiode sensing circuit and three switches.

The UR7HCMTB provides protocol auto-sensing, allowing the device to be linked through either the serial or PS/2 mouse port of the host system.

The UR7HCMTB will auto-switch  between the Serial and PS/2 mouse communication protocols depending on the port to which the device is actually connected.

The IC provides three-button mouse functionality. It is compatible with the IBM/Microsoft two-button and Logitech three-button mouse protocols.

The UR7HCMTB offers a factory programmable Ballistic Gain table that may be switched on and off dynamically. A fourth button is available to act as an on/off switch.

Communication through the serial port is half-duplex at a fixed speed of 1200 Baud. PS/2 communication, at 10 kbps, is bidirectional. The UR7HCMTB supports all commands from and to the system, as defined in the IBM PS/2 Mouse Communication Protocol.

The UR7HCMTB is a CMOS device operating at 4 MHz. The low-power consumption of the IC makes it suitable for battery-operated systems. Power in the serial mode, as in any standard mouse, can be drawn from the RS232 lines of the host system.
 
The URH7CMTB is available in Plastic DIP and SOIC packages. Custom versions are also available.