Oscillators – Relaxation oscillators
Reexamination Certificate
2006-02-28
2006-02-28
Lee, Thomas (Department: 2115)
Oscillators
Relaxation oscillators
C331S111000, C713S320000
Reexamination Certificate
active
07005933
ABSTRACT:
A microcontroller having a dual mode relax oscillator that is trimmable. In one embodiment, the present invention provides a relaxation oscillator circuit comprising two current sources for establishing a reference voltage for use in causing the relaxation oscillator circuit to operate in two power modes, and a control coupled to both current sources for switching between power modes. In one embodiment, one power mode is a low power mode for standard operation of the microcontroller and one power mode is a very low power mode for use in a sleep mode. In one embodiment, the relaxation oscillator circuit further comprises digitally trimmable components operable to control a current charging a capacitor of the relaxation oscillator circuit to account for process variation in the capacitor, wherein the current is for controlling a frequency of the microcontroller.
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Cypress Semiconductor Corporation
Lee Thomas
Suryawanshi Suresh K
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