Driving circuit adapted for use in optical mice
First Claim
1. A control circuit comprising:
- a first port for connecting an illumination device;
a second port connecting said control circuit to a power supply;
a drive circuit connected to said first port, said drive circuit passing a current between said first port and said second port having an amplitude determined by a control signal connected thereto;
a potential measuring circuit that generates a signal indicative of a drive circuit potential between said first and second ports; and
a controller that generates said control signal,wherein said controller records said drive circuit potential for a predetermined current when said first port is connected to an illumination device and said controller sets said control signal based on said recorded drive circuit potential.
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Accused Products
Abstract
A control circuit having a drive circuit and a controller adapted for use in optical mice is disclosed. The drive circuit is connected between first and second ports and passes a current between those ports having an amplitude determined by a control signal that is generated by the controller. The first port is connected to an illumination device and the second port is connected to a power rail. The control circuit also includes a potential measuring circuit that generates a signal indicative of a drive circuit potential between the first and second ports. The controller records the drive circuit potential for a predetermined current when the first port is connected to an illumination device. The controller sets the control signal based on the recorded drive circuit potential. The control circuit can record the drive circuit potential when the controller is powered.
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Citations
8 Claims
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1. A control circuit comprising:
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a first port for connecting an illumination device; a second port connecting said control circuit to a power supply; a drive circuit connected to said first port, said drive circuit passing a current between said first port and said second port having an amplitude determined by a control signal connected thereto; a potential measuring circuit that generates a signal indicative of a drive circuit potential between said first and second ports; and a controller that generates said control signal, wherein said controller records said drive circuit potential for a predetermined current when said first port is connected to an illumination device and said controller sets said control signal based on said recorded drive circuit potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification