Integrated circuit chip for analogue electronic watch applications
US7387433B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 24, 2006 |
| Grant date | Jun 17, 2008 |
| Priority date | — |
| Expiry date | Jun 9, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G3/027
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.