Magnetic field sensor to detect direction of angular rotation of a rotating magnetic structure, speed of the rotating magnetic structure or fault

An integrated circuit (IC) comprising:

• a magnetic field sensor to detect speed and direction of angular rotation of a rotating magnetic structure, the magnetic field sensor comprising:
• at least two magnetic field sensing elements configured to sense changes in a magnetic field caused by rotation of the magnetic structure;
• and
• an output port configured to provide an output signal of the magnetic field sensor, the output signal indicating the angular direction and one of the speed or a fault,
• wherein the output signal at a first value or at a second value indicating the magnetic structure rotating in a first direction,
• wherein the output signal at a third value or at a fourth value indicating the magnetic structure rotating in a second direction opposite the first direction,
• wherein the first value and the third value are equal.

An integrated circuit (IC) comprising:

• a magnetic field sensor to detect speed and direction of angular rotation of a rotating magnetic structure, the magnetic field sensor comprising:
• at least two magnetic field sensing elements configured to sense changes in a magnetic field caused by rotation of the magnetic structure;
• and
• an output port configured to provide an output signal of the magnetic field sensor, the output signal indicating the angular direction and one of the speed or a fault, wherein the magnetic field sensor further comprises:
• a first converter configured to convert a first signal from a first magnetic field sensing element to a first digital signal;
• a second converter configured to convert a second signal from a second magnetic field sensing element to a second digital signal;
• direction detection circuitry configured to receive the first digital signal and the second digital signal and to provide a direction signal;
• a frequency locked loop configured to receive the first digital signal and to provide a frequency signal;
• a decoder to receive the direction signal and the frequency signal;
• and
• a two-wire circuit configured to receive at least three signals from the decoder and to provide the output signal.

An integrated circuit (IC) comprising:

• a magnetic field sensor means to detect speed and direction of angular rotation of a rotating magnetic structure, the magnetic field sensor means comprising:
• a means to sense changes in a magnetic field caused by rotation of the magnetic structure;
• and
• an output port configured to provide an output signal of the magnetic field sensor means, the output signal indicating the angular direction and one of the speed or a fault,
• wherein the output signal at a first value or at a second value indicating the magnetic structure rotating in a first direction,
• wherein the output signal at a third value or at a fourth value indicating the magnetic structure rotating in a second direction opposite the first direction,
• wherein the first value and the third value are equal.

An integrated circuit (IC) comprising:

• a magnetic field sensor to detect speed and direction of angular rotation of a rotating magnetic structure, the magnetic field sensor comprising:
• at least two magnetic field sensing elements configured to sense changes in a magnetic field caused by rotation of the magnetic structure;
• and
• an output port configured to provide an output signal of the magnetic field sensor, the output signal indicating the angular direction of the rotating magnetic structure and a fault indicator,
• wherein a frequency of the output signal is the fault indicator indicating no faults are detected or a fault is detected,
• wherein the frequency within a frequency range indicates no faults are detected and the speed of the rotating magnetic structure,
• wherein the frequency below the frequency range indicates one or more faults, and
• wherein the frequency above the frequency range indicates one or more faults.

An integrated circuit (IC) comprising:

• a magnetic field sensor means to detect speed and direction of angular rotation of a rotating magnetic structure, the magnetic field sensor means comprising:
• a means to sense changes in a magnetic field caused by rotation of the magnetic structure;
• and
• an output port configured to provide an output signal of the magnetic field sensor means, the output signal indicating the angular direction and one of the speed or a fault,
• wherein the output signal at a first value or at a second value indicating the magnetic structure rotating in a first direction,
• wherein the output signal at a third value or at a fourth value indicating the magnetic structure rotating in a second direction opposite the first direction,
• wherein no two values of the first value, the second value, the third value or the fourth value are equal.