| 摘要 |
PROBLEM TO BE SOLVED: To provide a Hall IC capable of reducing average consumption current, and a method of operating the same. SOLUTION: An N-pole detecting circuit 13 energizes a Hall element 12 by turning on a power supply 11 and detects that an N-pole is applied to a permanent magnet. An S-pole detecting circuit 14 energizes the Hall element 12 by turning on the power supply 11 and detects that an S-pole is applied to the permanent magnet. A polarity discrimination processing circuit 15 carries out any one of detection operation processing by discriminating polarities output by the N-pole detecting circuit 13 and the S-pole detecting circuit 14. A two-pole detecting operation is carried out during a period from the first turning on operation of the power supply 11 until any one of magnetic poles is detected first, and after detecting the magnetic pole, only an operation of detecting the magnetic pole on the detected side is carried out. The first detected magnetic pole is stored in a nonvolatile memory 16, and a single-side magnetic pole detection is carried out from the beginning in the second start-up or later. COPYRIGHT: (C)2011,JPO&INPIT |
