Methods and apparatus to detect voltage class of a circuit
First Claim
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1. A system for detecting a voltage class of a circuit, the system comprising:
- a processor configured for;
selecting a threshold voltage level corresponding to one of three or more voltage classes each having a respective class threshold voltage, andtransmitting a control signal indicative of the threshold voltage level;
a voltage class detector coupled to the processor and configured for;
receiving the control signal;
setting a detection voltage level based on the control signal;
comparing a voltage of the circuit with the detection voltage level and determining that the voltage of the circuit reaches the detection voltage level; and
in response to determining that the voltage of the circuit reaches the detection voltage level, determining that the voltage class of the circuit is the voltage class corresponding to the selected threshold voltage level.
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Abstract
A method including monitoring whether an externally originating signal reaches a predetermined threshold value in a host, producing an output value based on the monitoring, and identifying a power environment for the host based on the output value is described. Also described is a method for determining the power environment of a host. Systems and hosts for implementing the methods are also described.
24 Citations
11 Claims
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1. A system for detecting a voltage class of a circuit, the system comprising:
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a processor configured for; selecting a threshold voltage level corresponding to one of three or more voltage classes each having a respective class threshold voltage, and transmitting a control signal indicative of the threshold voltage level; a voltage class detector coupled to the processor and configured for; receiving the control signal; setting a detection voltage level based on the control signal; comparing a voltage of the circuit with the detection voltage level and determining that the voltage of the circuit reaches the detection voltage level; and in response to determining that the voltage of the circuit reaches the detection voltage level, determining that the voltage class of the circuit is the voltage class corresponding to the selected threshold voltage level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining a voltage class for a host device, comprising:
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selecting a first threshold voltage; monitoring whether a supply voltage of the circuit reaches the first threshold voltage; identifying a first voltage class for the host if the supply voltage does not reach the first threshold voltage; if the supply voltage reaches the first threshold voltage, selecting a second threshold voltage; monitoring whether the supply voltage reaches the second threshold voltage; identifying a second voltage class for the host if the supply voltage does not reach the second threshold voltage if the supply voltage reaches the second threshold voltage, selecting a third threshold Voltage; monitoring whether the supply voltage reaches the third threshold voltage; and identifying a third voltage class for the host if the supply voltage does not reach the third threshold voltage. - View Dependent Claims (10)
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11. A system for determining a voltage class of a circuit, the system comprising:
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means for selecting a threshold voltage level corresponding to one of three or more voltage classes each having a respective class threshold voltage, and means for transmitting a control signal indicative of the threshold voltage level; means for receiving the control signal; means for setting a detection voltage level based on the control signal; means for comparing a supply voltage of the circuit with the detection voltage level and determining that the voltage of the circuit reaches the detection voltage level; and means for determining that the voltage class of the circuit is the voltage class corresponding to the selected threshold voltage level.
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Specification