Variable voltage detector power-up and power-down circuit for a

Details Variable voltage detector power-up and power-down circuit for a Variable voltage detector power-up and power-down circuit for a

1996-11-13

1999-02-23

Wu, Daniel J.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Cursor mark position control device

345212, 320161, G09G 508

Patent

active

058749446

ABSTRACT:
There is provided herein a joystick interface which includes circuitry to detect when the joystick output signal has been at a steady-state level for a predetermined period of time and upon detection of that condition, the circuitry powers down at least some of the circuitry associated with providing the digital signal representation to the computer. In one particular embodiment of the invention, analog circuitry including a slope detector, makes use of two non-overlapping clocks to sample data and provide it to a comparator. The comparator is used to determine if there has been any change between consecutive or sequential samples, representative of joystick shaft movement. After a predetermined number of comparisons showing no change in either a neutral joystick position or a non-neutral joystick position, the digital circuitry is powered-down to a reduced power operating mode. Upon the detection of change between samples at any single comparator, a signal to return full power to the circuitry in the reduced power mode is provided.

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patent: 5680154 (1997-10-01), Shiga et al.
patent: 5784051 (1998-07-01), Harrow et al.

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