Dynamic critical battery detection mechanism
First Claim
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1. An apparatus comprising:
- a voltage supply source;
a low voltage detection circuit coupled to the voltage supply source; and
a voltage offset circuit coupled to the low voltage detection circuit, wherein the voltage offset circuit offsets a voltage drop in the low voltage detection circuit caused by a voltage transient to prevent a false reading in the low voltage detection circuit and the voltage offset circuit uses at least one signal from a central processing unit to detect a voltage drop due to a change of the voltage supply source.
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Abstract
An electronic device including a voltage supply source is presented. Included in the electronic device is a low voltage detection circuit that is connected to the voltage supply source. Also, a voltage offset circuit is connected to the low voltage detection circuit. The voltage offset circuit offsets a voltage drop in the low voltage detection circuit that is caused by a voltage transient. Therefore, a false reading is prevented in the low voltage detection circuit.
10 Citations
40 Claims
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1. An apparatus comprising:
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a voltage supply source;
a low voltage detection circuit coupled to the voltage supply source; and
a voltage offset circuit coupled to the low voltage detection circuit, wherein the voltage offset circuit offsets a voltage drop in the low voltage detection circuit caused by a voltage transient to prevent a false reading in the low voltage detection circuit and the voltage offset circuit uses at least one signal from a central processing unit to detect a voltage drop due to a change of the voltage supply source. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system comprising:
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a processor coupled to a processor voltage regulator;
a bus coupled to the processor;
a memory coupled to a main voltage regulator;
a voltage supply source coupled to the main voltage regulator and the processor voltage regulator;
a low voltage detection circuit coupled to the voltage supply source; and
a voltage offset circuit coupled to the low voltage detection circuit, wherein the voltage offset circuit offsets a voltage drop in the low voltage detection circuit caused by a voltage transient to prevent a false reading in the low voltage detection circuit and the voltage offset circuit uses at least one signal from the processor to detect a voltage drop due to a change of the voltage supply source. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method comprising:
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determining if a first voltage is lower than a reference voltage;
determining if a voltage supply source has changed using at least one signal from a central processing unit; and
generating a second voltage to offset a voltage drop if the voltage supply source has changed and the first voltage is lower than the reference voltage, wherein the second voltage prevents a false trigger caused by a change of the voltage supply source. - View Dependent Claims (14, 15, 16, 17)
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18. A program storage device readable by a machine comprising instructions that cause the machine to:
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determine if a first voltage is lower than a reference voltage;
determine if a voltage supply source has changed; and
generate a second voltage to offset a voltage drop if the voltage supply source has changed and the first voltage is lower than the reference voltage, wherein the second voltage prevents a false trigger caused by a change of the voltage supply source. - View Dependent Claims (19, 20, 21, 22, 23)
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24. An apparatus comprising:
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a voltage supply source;
a low voltage detection circuit coupled to the voltage supply source; and
a voltage offset circuit coupled to the low voltage detection circuit, wherein the voltage offset circuit offsets a voltage drop in the low voltage detection circuit caused by a voltage transient to prevent a false reading in the low voltage detection circuit and the voltage offset circuit comprises a current monitor circuit, wherein a current from the voltage supply source is monitored for transients, and an offset voltage is generated. - View Dependent Claims (25, 26, 27, 28, 29)
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30. A system comprising:
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a processor coupled to a processor voltage regulator;
a bus coupled to the processor;
a memory coupled to a main voltage regulator;
a voltage supply source coupled to the main voltage regulator and the processor voltage regulator;
a low voltage detection circuit coupled to the voltage supply source; and
a voltage offset circuit coupled to the low voltage detection circuit, wherein the voltage offset circuit offsets a voltage drop in the low voltage detection circuit caused by a voltage transient to prevent a false reading in the low voltage detection circuit and the voltage offset circuit comprises a current monitor circuit, wherein a current from the voltage supply source is monitored for transients, and an offset voltage is generated. - View Dependent Claims (31, 32, 33, 34, 35)
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36. A method comprising:
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determining if a first voltage is lower than a reference voltage;
determining if a voltage supply source has changed; and
generating a second voltage to offset a voltage drop if the voltage supply source has changed and the first voltage is lower than the reference voltage by monitoring current from the voltage supply source for transients, wherein the second voltage prevents a false trigger caused by a change of the voltage supply source. - View Dependent Claims (37, 38, 39, 40)
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Specification