Power up reset circuit for line powered circuit
First Claim
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1. A method of powering an electronic circuit with a telephone line, comprising:
- conditioning the voltage across the telephone line;
detecting the conditioned voltage; and
applying telephone line power to the electronic circuit based on a characteristic of the detected conditioned voltage, said characteristic comprising the detected voltage exceeding the absolute value of one P-channel threshold voltage plus one N-channel threshold voltage in the electronic circuit.
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Abstract
A system for powering up an electronic circuit with telephone line power such that the electronic circuit does not enter a lockup state. The system includes a voltage detector that measures the voltage across the telephone line and a switch coupled with the voltage detector. The voltage detector generates a Reset signal when the measured voltage exceeds a selected voltage level, and the switch applies power to the electronic circuit in response to the generated Reset signal.
42 Citations
21 Claims
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1. A method of powering an electronic circuit with a telephone line, comprising:
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conditioning the voltage across the telephone line; detecting the conditioned voltage; and applying telephone line power to the electronic circuit based on a characteristic of the detected conditioned voltage, said characteristic comprising the detected voltage exceeding the absolute value of one P-channel threshold voltage plus one N-channel threshold voltage in the electronic circuit. - View Dependent Claims (2, 3, 4, 5, 7, 8, 9, 10, 11)
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6. A method of powering an electronic circuit with a telephone line, comprising:
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detecting the voltage across the telephone line, and applying telephone line power to the electronic circuit based on a characteristic of the detected voltage; wherein the step of applying telephone line power further includes the step of applying telephone line power when the detected voltage exceeds the absolute value of one P-channel threshold voltage plus one N-channel threshold voltage in the electronic circuit.
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12. A method of powering a data access arrangement with a telephone line, the data access arrangement having a CMOS electronic circuit, the method comprising:
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applying a reset signal to the data access arrangement, detecting a conditioned voltage across the telephone line while the telephone line is in an on-hook state, powering the data access arrangement with telephone line power when the detected conditioned voltage exceeds a voltage necessary to properly operate the CMOS electronic device, said detected conditioned voltage exceeding the absolute value of one P-channel threshold voltage plus one N-channel threshold voltage in the electronic circuit, and turning-off the reset signal to the electronic circuit after powering the data access arrangement.
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13. An apparatus for powering an electronic circuit with telephone line power, the apparatus comprising:
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a conditioning circuit situated across the telephone line; a voltage detector that measures the conditioned voltage across the conditioning circuit and that generates a Reset signal based on a characteristic of the measured conditioned voltage, said characteristic comprising the detected voltage exceeding the absolute value of one P-channel threshold voltage plus one N-channel threshold voltage in the electronic circuit, and a switch, operably coupled with the voltage detector, for applying telephone line power to the electronic circuit in response to the generated Reset signal. - View Dependent Claims (14, 15, 16, 17, 19, 20, 21)
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18. An apparatus for powering an electronic circuit with telephone line power, the apparatus comprising:
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a voltage detector that measures the voltage across the telephone line and that generates a Reset signal based on a characteristic of the measured voltage, and a switch, operably coupled with the voltage detector, for applying telephone line power to the electronic circuit in response to the generated Reset signal, wherein the voltage detector further includes circuitry for enabling the electronic circuit after the measured voltage exceeds the absolute value of one P-channel threshold voltage plus one N-channel threshold voltage in the electronic circuit.
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Specification