Abstract: A touch screen controller system for controlling a touch screen having row conductors and column conductors includes analog-digital circuitry coupled to the row conductors and column conductors to produce digital signals representative of self capacitance changes of one of the column conductors during an element proximity scanning mode and also representative of mutual changes of the touch screen during an element location scanning mode. The analog-digital circuitry indicates the influence of an element on the self-capacitance during the element proximity scanning. Proximity-determining circuitry operates on the digital signal changes during the element proximity scanning to determine if the element is proximate to the touch screen, and also to determine if the element is a specific kind of element by comparing the digital signal changes to a predetermined data profile.

Abstract: A touch screen controller system for controlling a touch screen having row conductors and column conductors includes analog-digital circuitry coupled to the row conductors and column conductors to produce digital signals representative of self capacitance changes of one of the column conductors during an element proximity scanning mode and also representative of mutual changes of the touch screen during an element location scanning mode. The analog-digital circuitry indicates the influence of an element on the self-capacitance during the element proximity scanning. Proximity-determining circuitry operates on the digital signal changes during the element proximity scanning to determine if the element is proximate to the touch screen, and also to determine if the element is a specific kind of element by comparing the digital signal changes to a predetermined data profile.

Abstract: A touch screen controller system for controlling a touch screen having row conductors and column conductors includes analog-digital circuitry coupled to the row conductors and column conductors to produce digital signals representative of self capacitance changes of one of the column conductors during an element proximity scanning mode and also representative of mutual changes of the touch screen during an element location scanning mode. The analog-digital circuitry indicates the influence of an element on the self-capacitance during the element proximity scanning. Proximity-determining circuitry operates on the digital signal changes during the element proximity scanning to determine if the element is proximate to the touch screen, and also to determine if the element is a specific kind of element by comparing the digital signal changes to a predetermined data profile.

Abstract: Generally, this disclosure provides devices, systems and methods for securing a mobile platform with a security cable, employing an electronically controlled locking mechanism which may be in communication with the platform. A device may include a lock to mate with a lock receiver of the platform, and the lock is coupled to the cable; a locking mechanism driver module to controllably engage and release the lock from the lock receiver; and a communication interface module to receive a signal from the platform and to control the locking mechanism driver module based on the signal.

Abstract: Generally, this disclosure provides devices, systems and methods for securing a mobile platform with a security cable, employing an electronically controlled locking mechanism which may be in communication with the platform. A device may include a lock to mate with a lock receiver of the platform, and the lock is coupled to the cable; a locking mechanism driver module to controllably engage and release the lock from the lock receiver; and a communication interface module to receive a signal from the platform and to control the locking mechanism driver module based on the signal.

Abstract: A touch screen controller system for controlling a touch screen having row conductors and column conductors includes analog-digital circuitry coupled to the row conductors and column conductors to produce digital signals representative of self capacitance changes of one of the column conductors during an element proximity scanning mode and also representative of mutual changes of the touch screen during an element location scanning mode. The analog-digital circuitry indicates the influence of an element on the self-capacitance during the element proximity scanning. Proximity-determining circuitry operates on the digital signal changes during the element proximity scanning to determine if the element is proximate to the touch screen, and also to determine if the element is a specific kind of element by comparing the digital signal changes to a predetermined data profile.

Abstract: A water-cooling system for computer electronic components, particularly the central processing unit. The system has a cooling unit adjacent to, and below, the central processing unit. The intake and outlet ports into and from the cooling unit are insulated with a water-absorbent material and below the cooling unit is a drip pan adapted to collect water being discharged from the cooling unit caused by any leak occurring therein. The drip pan has a plurality of parallel spaced-apart angled blades adapted to deflect dripping water to an adjacent blade covering the former blade.

Abstract: A pulse width modulated (PWM) transistor driver circuit, for driving an inductive load, has a load-current sensing resistor and a comparator having an input connected to the sensing resistor and another input to which a PWM control reference voltage may be applied. A PWM driver-control circuit includes a set-dominant PWM latch, and a not.sub.-- regulating detector that may be composed entirely of logic circuit blocks or a combination of logic and analog circuits. By either means, the PWM bridge-control circuit includes a timer for repeatedly generating control pulses that set and hold a PWM latch beginning each PWM period, and the comparator resets the latch each time after the timer pulse the load current rises to exceed a corresponding reference voltage level. A sample-time-interval is defined beginning at the time of termination of a control pulse and a not.sub.-- regulating pulse generator produces a not.sub.

Abstract: A bridge for driving one phase of a stepping motor includes a PWM driver control circuit that repeatedly turns on at least one of the driver transistors. A sense voltage is produced that is directly related to the bridge load current. When a driver-control reference voltage V.sub.ref is applied to the driver-control input, a sense-comparator pulse is generated when the sense voltage exceeds the applied reference voltage for turning off the one driver transistor. The remaining "decay" portion of the PWM period ensues after the driver transistor turns off. A not.sub.-- regulating pulse is generated during a predetermined sample time portion of each driver on-time when the load sense voltage exceeds the applied V.sub.ref. In each PWM period, when a not.sub.-- regulating pulse occurs the bridge driver is operated in the four quadrant decay mode during an initial part of the PWM-period decay portion until time t.sub.m and operating in the two quadrant decay mode for the remainder of the PWM-period decay portion.

Abstract: A bipolar driver circuit includes a primary driver transistor and an independently controlled pre-driver transistor having an emitter connected to the base of the primary driver transistor and a collector connected to the collector of the primary driver transistor. In one embodiment, the collector of the primary driver transistor is connected to the output terminal of the driver circuit for sinking current from a load and, in another embodiment, the emitter of the primary driver transistor is connected to the output terminal of the driver circuit for sourcing current to a load. A first current source is connected to the base of the primary driver transistor and a second current source is connected to the base of the pre-driver transistor. The current sources are commonly controllable by an input signal. Also provided is an inverse conduction prevention circuit for preventing the pre-driver transistor from diverting base current from the primary driver transistor in the sink driver embodiment.

Abstract: A semiconductor integrated circuit has a P-type substrate and a plurality of PN-junction isolated islands of N-type, a first one of the islands may contain a power device which during certain periods of operation causes the first island to become forward biassed and to inject electrons into the substrate. Collection of these injected charges by a second island at one side of the injecting island is reduced by a separate protective bipolar transistor formed in a third N-type island. The third island is preferably interposed between the injecting island and the islands to be protected, but may be located anywhere with respect to the injecting transistor. The emitter of the protective transistor is electrically connected to an N-type portion of the first island. The collector of the protective transistor is connected to the P-type isolation-wall portion of the substrate located between the injecting transistor and the small islands to be protected.

Abstract: In an integrated circuit in which a first PN-junction-isolated island may momentarily become forward biased with respect to the surrounding substrate and inject unwanted charge that is collected by second islands adjacent one side of a first island, the injected charge is drawn away from the second islands and to a gatherer-collector island located at another side of the first island. The first island, gatherer-collector island and intervening substrate therebetween serve respectively as the emitter, collector, and base of a protective transistor. This transistor becomes a highly efficient collector of injected charge when the protective-transistor collector is hard wired to ground and the protective-transistor base is hard-wire connected to the substrate portion between the injecting first island and adjacent second island.