公开(公告)号：US20240111001A1

公开(公告)日：2024-04-04

申请号：US17956758

申请日：2022-09-29

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Preetinder Garcha ,  Srinath Ramaswamy ,  Viola Schaeffer

IPC: G01R33/04 ,  G01R33/00

CPC classification number: G01R33/04 ,  G01R33/0017

Abstract: In some examples, an apparatus comprises a first coil, a second coil, a control circuit, and a processing circuit. The second coil is magnetically coupled to the first coil. The control circuit has a signal output coupled to the first coil, and a control output, and the control circuit configured to: responsive to a state of the control input, select a field strength level from a set of discrete field strength levels; and provide a first signal representing the selected field strength level at the signal output. Also, the processing circuit has processing inputs and a processing output, the processing inputs coupled to the second coil, the processing output coupled to the control input, and the processing circuit configured to, responsive to a second signal across the processing inputs, set a state of the processing output representing a polarity of a magnetic field sensed by the second coil.