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C h a p t e r 5 | M u l t i - T u r n P o s i t i o n S e n s i n g F u n d a m e n t a l s Engineers have long sought workarounds to achieve multi-turn position sensing, but these solutions come with drawbacks. Gearing mechanisms, designed to reduce multi-turns to a single-turn, result in bulky, heavy systems that suffer from mechanical wear, hysteresis, and limited accuracy. They often require multiple single-turn sensors, adding complexity to the system. Furthermore, backup batteries combined with memory chips and single-turn sensors increase size, weight, and maintenance needs, with batteries being particularly undesirable in robotics and specific operating environments. Even energy harvesting solutions that utilize Wiegand sensors and FRAM chips remain cumbersome and necessitate additional components. ADMT4000 Overview and Benefits ADI's release of the ADMT4000 in November 2024 represents a breakthrough in position sensing technology. This single-chip solution extends the absolute position sensing range from 360 degrees to 16,560 degrees, effectively providing a single device with a 46-turn full absolute magnetic encoder. By eliminating the need for complex workarounds, the ADMT4000 allows engineers to streamline their designs, reduce system size and weight, and enhance overall performance. The technology of ADMT4000 enables tracking of multiple rotations without power, making it ideal for monitoring actuators in robotic or humanoid joints. By eliminating the need for re-homing, this sensor streamlines the control process and reduces downtime. It can substitute linear transducers in rotary-to-linear actuators, backup batteries with single-turn sensors, and gearing with single-turn sensors, allowing mechanical designers to enhance their actuators regarding size, weight, and cost. 15 Engineering Reliable Industrial Automation With Sensor Fusion