Turn count decoding for multi-turn sensors
AssigneeAnalog Devices Global Unlimited Company
InventorsPeter James Tonge, Monsoon Dutt
Life of this patent
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Abstract
Aspects of the present disclosure relate to decoding the output of a multi-turn magnetic sensor using a successive approximation technique to detect a number of turns of a magnetic target. A decoder circuit can decode a turn count of the multi-turn magnetic sensor by obtaining measurements at nodes that are determined from values of previous measurements.
Claims20
A system for decoding a turn count of a multi-turn magnetic sensor, the system comprising:
- a multi-turn magnetic sensor comprising a magnetoresistive track;
- and
- a decoder circuit coupled to nodes of the magnetoresistive track, the decoder circuit configured to:
- detect a first pair of signals from a first pair of the nodes;
- select a second pair of the nodes based on values of the signals from the first pair of the nodes;
- detect a second pair of signals from the second pair of the nodes;
- and
- determine a turn count of the multi-turn sensor based at least in part on the first pair of signals and the second pair of signals.
A decoder circuit for decoding a state of a multi-turn magnetic sensor using successive approximation, the decoder circuit comprising circuitry configured to couple to nodes of a multi-turn magnetic sensor, measure pairs of signals from the at least some of the nodes selected using a successive approximation readout technique, and determine a turn count based at least in part on the measured pairs of signals.
A method of decoding a turn count of a multi-turn magnetic sensor, the method comprising:
- determining a pair of signals for a pair of locations of the multi-turn magnetic sensor;
- selecting a second pair of locations of the multi-turn magnetic sensor based at least in part on the values of the pair of signals;
- determining a second pair of signals for the second pair of locations;
- and
- decoding the turn count based at least in part on values of the first pair of signals and the second pair of signals.
Dependencies are inferred from the claim text.