System for providing electrical power to a computer input device

Details System for providing electrical power to a computer input device System for providing electrical power to a computer input device

1996-06-21

1999-07-06

Lee, Thomas C.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

395882, 395884, 395892, 361601, G06F 126

Patent

active

059207345

ABSTRACT:
A system permits the shared use of lines in a cursor control device coupled to a PS/2 interface or a serial interface. A computer pointing device such as a mouse can be coupled to either the PS/2 interface or the serial interface. The current supplied by the serial interface is limited by conventional circuitry within the interface itself. However, a clock line, normally used when the pointing device is coupled to the PS/2 interface, can be used to supply additional current to the pointing device when coupled to a serial interface. A Schottky diode is coupled in series between a V.sub.cc /RTS line and a power supply node within the pointing device. A second Schottky diode is coupled from a CLK/DTR line to the power supply node. When the pointing device is coupled to the PS/2 interface, the first Schottky diode provides current from a V.sub.cc source within the PS/2 interface. The second Schottky diode is not active when the pointing device is coupled to the PS/2 interface. When the pointing device is coupled to the serial interface, both the first and second Schottky diodes are active and both supply current to the power supply node. The first Schottky diode also prevents reverse current flow during initialization of the serial interface.

REFERENCES:
patent: 4886941 (1989-12-01), Davis et al.
patent: 5212774 (1993-05-01), Grider et al.
patent: 5331509 (1994-07-01), Kikinis
patent: 5343516 (1994-08-01), Callele et al.
patent: 5349253 (1994-09-01), Ngo et al.
patent: 5436552 (1995-07-01), Kajimoto
patent: 5499108 (1996-03-01), Cotte et al.
patent: 5633799 (1997-05-01), Dussell
patent: 5652603 (1997-07-01), Abrams

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