Ultra Low Power Wake-On-Event Mode For Biometric Systems
First Claim
1. An apparatus for reducing power consumption in fingerprint-sensing circuits, the apparatus comprising:
- a fingerprint sensing area onto which a user can apply a fingerprint; and
an integrated circuit for detecting finger activity over the fingerprint sensing area, the integrated circuit comprising;
a primary logic portion configured to assume control of the integrated circuit when finger activity is detected over the fingerprint sensing area; and
a secondary logic portion configured to assume control of the integrated circuit and shut off power to the primary logic portion when finger activity is not detected over the fingerprint sensing area.
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Accused Products
Abstract
An apparatus for reducing power consumption in fingerprint-sensing circuits is disclosed in one embodiment of the invention as including a fingerprint sensing area onto which a user can apply a fingerprint. An integrated circuit communicates with the fingerprint sensing area and is configured to detect finger activity over the fingerprint sensing area. The integrated circuit includes a primary logic portion configured to assume control of the integrated circuit when finger activity is detected over the fingerprint sensing area. The integrated circuit also includes a secondary logic portion configured to assume control of the integrated circuit and shut off power to the primary logic portion when finger activity is not detected over the fingerprint sensing area.
190 Citations
26 Claims
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1. An apparatus for reducing power consumption in fingerprint-sensing circuits, the apparatus comprising:
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a fingerprint sensing area onto which a user can apply a fingerprint; and an integrated circuit for detecting finger activity over the fingerprint sensing area, the integrated circuit comprising; a primary logic portion configured to assume control of the integrated circuit when finger activity is detected over the fingerprint sensing area; and a secondary logic portion configured to assume control of the integrated circuit and shut off power to the primary logic portion when finger activity is not detected over the fingerprint sensing area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for reducing power consumption in fingerprint-sensing circuits, the method comprising:
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providing control to a primary logic portion of an integrated fingerprint sensing circuit when finger activity is detected over a fingerprint sensing area; passing control to a secondary logic portion of the integrated fingerprint sensing circuit and shutting off power to the primary logic portion when finger activity is not detected over the fingerprint sensing area; and turning on power to the primary logic portion and passing control back to the primary logic portion when finger activity is detected over the fingerprint sensing area. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An apparatus for reducing power consumption in fingerprint-sensing circuits, the apparatus comprising:
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a fingerprint sensing area onto which a user can apply a fingerprint; and an integrated circuit for detecting finger activity over the fingerprint sensing area, the integrated circuit comprising; a primary logic portion configured to assume control of the integrated circuit when finger activity is detected over the fingerprint sensing area; a secondary logic portion configured to assume control of the integrated circuit and shut off power to the primary logic portion when finger activity is not detected over the fingerprint sensing area; and the secondary logic portion further comprising a substantially analog portion, the secondary logic portion further configured to periodically turn off power to the analog portion while the secondary logic portion has control of the integrated circuit.
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Specification