Depassivating circuitry for sensor batteries
AssigneeCisco Technology, Inc.
InventorsKevin William Holcomb, Aumen Kwok Lee
Life of this patent
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Abstract
In one embodiment, a depassivating circuit includes a battery, a resistive load coupled to the battery, and a magnetic field sensor. The magnetic field sensor detects a presence of a magnetic field. The magnetic field sensor depassivates the battery by causing current from the battery to flow through the resistive load, in response to the presence of the magnetic field. The magnetic field sensor detects removal of the magnetic field. The magnetic field sensor ends depassivation of the battery, in response to the removal of the magnetic field.
Claims20
A depassivating circuit comprising:
- a battery;
- a resistive load coupled to the battery;
- and
- a magnetic field sensor that without using a processor:
- detects a presence of a magnetic field;
- depassivates the battery by causing current from the battery to flow through the resistive load, in response to the presence of the magnetic field;
- detects removal of the magnetic field;
- and
- ends depassivation of the battery, in response to the removal of the magnetic field.
A method comprising:
- detecting, by a depassivating circuit without using a processor, presence of a magnetic field;
- depassivating, by the depassivating circuit, a battery coupled to the depassivating circuit, in response to the presence of the magnetic field;
- detecting, by the depassivating circuit, removal of the magnetic field;
- and
- ending, by the depassivating circuit, the depassivating of the battery, in response to the removal of the magnetic field.
A wireless sensor device comprising:
- sensor circuitry that includes one or more sensors;
- a battery;
- a resistive load coupled to the battery;
- and
- a magnetic field sensor that without using a processor:
- detects a presence of a magnetic field;
- depassivates the battery by causing current from the battery to flow through the resistive load, in response to the presence of the magnetic field;
- detects removal of the magnetic field;
- and
- ends depassivation of the battery, in response to the removal of the magnetic field.
Dependencies are inferred from the claim text.