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US 2014/0232380 A1Published application
Motion Sensor, Method, and Computer-Readable Storage Medium Providing a Motion Sensor with a State Processor Having a Reduced Amount of State Chatter
AssigneeAllegro MicroSystems, LLC
InventorsAndrea Foletto, Devon Fernandez, Eric Burdette
Life of this patent
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Abstract
A motion sensor has a state processor to identify states associated with a magnetic field signal provided by a magnetic field sensing element. The state processor includes a state peak logic module configured to generate states that have a reduced amount of state chatter.
Claims42
A magnetic field sensor, comprising:
- a plurality of magnetic field sensing elements configured to generate at least one magnetic field signal indicative of a magnetic field associated with an object;
- and
- a first state processor, the first state processor coupled to receive a signal representative of a first one of the at least one magnetic field signal, wherein the first state processor comprises:
- a first state logic module configured to generate a first STATE_SM signal indicative of a first plurality of states associate with the first one of the at least one magnetic field signal, wherein the first plurality of states is indicative of a respective range of signal values of the first one of the least one magnetic field signal, wherein the first STATE_SM signal comprises a respective plurality of state transitions capable of respective state transition chatter, wherein the first state logic module is further configured to generate a first two-state POSCOMP signal having first and second different state transitions that occur when the first STATE_SM signal is representative of respective first and second states;
- and
- a first state peak logic module coupled to receive the first STATE_SM signal and configured to generate a first STATE_PEAK signal, wherein the first STATE_PEAK signal comprises a respective plurality of state peak transitions having respective reduced state chatter, wherein the magnetic field sensor further comprises:
- a vibration processor coupled to the first state processor, the vibration processor comprising:
- a POSCOMP validation processor, wherein the POSCOMP validation processor is coupled to receive a first plurality of test results associated with a first plurality of tests and to set a state of a POSCOMP_OK flag signal if selected ones of the first plurality of test results is indicative of a respective passing condition, wherein the set POSCOMP_OK flag signal is indicative of the first POSCOMP signal being valid.
5 more elements
A method used in a magnetic field sensor, comprising:
- generating at least one magnetic field signal indicative of a magnetic field associated with an object;
- generating a first STATE_SM signal indicative of a first plurality of states associated with a first one of the at least one magnetic field signal, wherein the first plurality of states is indicative of a respective range of signal values of the first one of the at least one magnetic field signal, wherein the first STATE_SM signal comprises a respective plurality of state transitions capable of respective state transition chatter, wherein the first state logic module is further configured to generate a first two-state POSCOMP signal having first and second different state transitions that occur when the first STATE_SM signal is representative of respective first and second states;
- generating a first STATE_PEAK signal using the first STATE_SM signal, wherein the first STATE_PEAK signal comprises a respective plurality of state peak transitions having respective reduced state chatter;
- receiving a first plurality of test results associated with a first plurality of tests;
- and
- setting a state of a POSCOMP_OK flag signal if selected ones of the first plurality of test results is indicative of a respective passing condition, wherein the set POSCOMP_OK flag signal is indicative of the first POSCOMP signal being valid.
3 more elements
A non-transitory computer-readable storage medium having computer-readable code stored therein, comprising:
- instructions for receiving at least one magnetic field signal indicative of a magnetic field associated with an object;
- instructions for generating a first STATE_SM signal indicative of a first plurality of states associated with a first one of the at least one magnetic field signal, wherein the first plurality of states is indicative of a respective range of signal values of the first one of the at least one magnetic field signal, wherein the first STATE_SM signal comprises a respective plurality of state transitions capable of respective state transition chatter, wherein the first state logic module is further configured to generate a first two-state POSCOMP signal having first and second different state transitions that occur when the first STATE_SM signal is representative of respective first and second states;
- instructions for generating a first STATE_PEAK signal using the first STATE_SM signal, wherein the first STATE_PEAK signal comprises a respective plurality of state peak transitions having respective reduced state chatter;
- instructions for receiving a first plurality of test results associated with a first plurality of tests;
- and
- instructions for setting a state of a POSCOMP_OK flag signal if selected ones of the first plurality of test results is indicative of a respective passing condition, wherein the set POSCOMP_OK flag signal is indicative of the first POSCOMP signal being valid.
3 more elements
Dependencies are inferred from the claim text.