Back to results
US 7,387,433 B2Granted
Integrated circuit chip for analogue electronic watch applications
AssigneeLinx Technology Limited
InventorPatrick Siu-Ying Hung
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeLinx Technology Limited
InventorPatrick Siu-Ying Hung
Estimating the term…
An integrated circuit for analogue electronic watch applications, comprising an oscillator circuit for generating clock signals, stepper motor driver circuit for generating motor driving signals, a plurality of trimming capacitors for fine-tuning the output frequency of the oscillator circuit and a corresponding plurality of electronic switches for selectively connecting/disconnecting said trimming capacitors to said oscillator circuit and switching circuitry for switching-in and/or -out the electronic switch, wherein said stepper motor driver circuit being connected to said oscillator circuit and comprising means for converting said clock signals into said motor driving signals, said switching circuitry comprises means to control the switching-in and/or switching-out of said electronic switches whereby oscillator frequency is fine-tuned, said plurality of electronic switches being selectively controllable and operable by switching control signals applied at said frequency trimming port.
An integrated circuit for analog electronic watch applications, comprising an oscillator circuit for generating clock signals, a stepper motor driver circuit for generating motor driving signals, a plurality of trimming capacitors for fine-tuning the output frequency of the oscillator circuit and a corresponding plurality of electronic switches for selectively connecting/disconnecting said trimming capacitors to said oscillator circuit and switching circuitry for switching-in and/or -out the electronic switch, wherein said stepper motor driver circuit is connected to said oscillator circuit and comprises means for converting said clock signals into said motor driving signals, said switching circuitry comprises means to control the switching-in and/or switching-out of said electronic switches whereby oscillator frequency is fine-tuned, and said plurality of electronic switches are selectively controllable and operable by switching control signals applied at a frequency trimming port.
An integrated circuit for analog electronic watch applications, comprising an oscillator circuit for generating clock signals, a stepper motor driver circuit for generating motor driving signals, a test circuit for testing a stepper motor, a reset circuit for stopping and starting said oscillator circuit, and one or two on-chip trimming capacitors, wherein said trimming capacitors are located in the external pads of said test and reset circuits, and the oscillator frequency can be adjusted by connecting either oscillator input or output pad with test pad, reset pad, or both.
Dependencies are inferred from the claim text.