Low Current Microcontroller Circuit
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Abstract
A method and system for accurate timing in a low current system useful in fuzing applications generates a first count of oscillations of an oscillator of unknown frequency during a first period of unknown duration. A second count of oscillations of the oscillator is generated during a second period of a known duration. The duration of the first period is calculated based on the first count and the second count. A solid-state, thin-film battery is able to be used by virtue of low-current characteristics of the system, enabling extended shelf life for fuzing systems.
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Citations
23 Claims
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1-3. -3. (canceled)
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4. A fuze system having a shelf life of greater than twenty years and operable at temperatures down to −
- 45.6°
C. comprising;a solid-state thin film lithium battery; and a low current controller coupled to the solid-state thin film lithium battery via a switch, the low current controller configured to draw a mean current of less than 8 μ
A and to generate a firing signal. - View Dependent Claims (5, 6, 7, 8, 9)
- 45.6°
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10. (canceled)
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11. A method for determining a duration of a first period beginning from a startup time in a system including a first oscillator of an unknown frequency and a second oscillator of a known frequency, the method comprising:
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generating a first count corresponding to a number of oscillations of the first oscillator during a first period; generating a second count corresponding to a number of oscillations of the first oscillator during a second period, the second period having a duration corresponding to a known number of oscillations of the second oscillator; and calculating the duration of the first period based on the first count and the second count. - View Dependent Claims (12)
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13. A timing system comprising:
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a first oscillator; a second oscillator; a first means for counting a number of oscillations of the second oscillator during a first period beginning at a startup time; a second means for counting a number of oscillations of a second oscillator during a second period beginning after oscillation of the first oscillator; and a processor for generating a time value corresponding to the first period based at least in part on the number of oscillations of the second oscillator during the first period and the number of oscillations of the second oscillator during the second period, wherein the time value corresponds to the startup delay of the first oscillator. - View Dependent Claims (14, 15, 16, 17)
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18. A timing system comprising:
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a first crystal oscillator; a second oscillator, wherein a frequency of the second oscillator is unknown; a first counter coupled to the second oscillator, the first counter generating a first count corresponding to a number of oscillations of the second oscillator during a first period beginning at a startup time and generating a second count corresponding to a number of oscillations of the second oscillator during a second period of a known number of oscillations of the first crystal oscillator; a processor coupled to the first counter for receiving the first count and the second count and generating a time value corresponding to the first period based on the first count and the second count, wherein the time value corresponds to a startup delay of the first crystal oscillator. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification