Light emitting diode driver for dimming and on/off control
AssigneeAllegro MicroSystems, LLC
InventorsManuel Rivas, Gerardo A. Monreal
Life of this patent
Estimating the term…
Abstract
In one aspect, an integrated circuit (IC) includes a first magnetic field sensor configured to sense a ring magnet, a second magnetic field sensor configured to sense the ring magnet and processing circuitry configured to receive a first signal from the first magnetic field sensor and to receive a second signal from the second magnetic field sensor. The processing circuitry is further configured to control an on/off state of at least one light emitting diode (LED) and brightness of the LED based on movement and position of the ring magnet with respect to the first and second magnetic field sensors.
Claims20
An integrated circuit (IC) comprising:
- a first magnetic field sensor configured to sense a magnet;
- a second magnetic field sensor configured to sense the magnet;
- and
- processing circuitry configured to:
- receive a first signal from the first magnetic field sensor, wherein the first signal is based upon movement and position of the magnet with respect to the first magnetic field sensor;
- receive a second signal from the second magnetic field sensor, wherein the second signal is based upon movement and position of the magnet with respect to the second magnetic field sensor;
- and
- control an on/off state and brightness of a light emitting diode (LED) based on the received first and second signals.
An integrated circuit (IC) comprising:
- a first magnetic field sensor configured to sense a magnet;
- a second magnetic field sensor configured to sense the magnet;
- and
- processing circuitry configured to:
- receive a first signal from the first magnetic field sensor, wherein the first signal changes in response to movement and position of the magnet with respect to the first magnetic field sensor;
- receive a second signal from the second magnetic field sensor, wherein the second signal changes in response to movement and position of the magnet with respect to the second magnetic field sensor;
- and
- control current to at least one light emitting diode (LED) based on the received first and second signals.
An integrated circuit (IC) comprising:
- a first sensor means for sensing a magnet;
- a second sensor means for sensing the magnet;
- and
- processing means for controlling current to at least one light emitting diode (LED) in response to movement and position of the magnet with respect to the first and second sensor means, wherein the processing means is configured to hold the at least one LED in an off state while the magnet is at a distance from the IC greater than a threshold distance.
Dependencies are inferred from the claim text.