Magnetic sensors are in a TO-6 package for PCB-less applications

TMR angle sensors in the TMR sensor range from TDK now include the TAD2140 type in a TO-6 package for automotive and industrial applications. The sensor’s system-in-package for PCB-less applications includes two full TMR bridges, a dedicated ASIC for signal conditioning and integrated passive components.

The TAD2140 has an angle accuracy of ±0.2 degrees, achieving the world’s smallest angle error of only ±0.05 degrees at room temperature, says the company. The sensors are capable of contactless sensing from 0 to 360 degrees over a temperature range of −40 to +150 degree C. The sensor’s fast response, high angular accuracy, and advanced compensation algorithms make it suitable for the optimisation of motor control applications such as BLDC motor commutation.

Its package size suits applications with limited available space, such as steering motor commutation.

The TO-6 package integrates six capacitors and one resistor. The sensor can be welded or soldered directly onto a package lead, a connector or a terminal, eliminating the need for a PCB, and reducing total system size and cost. Using fewer external components and lowering the number of solder joints improves the long-term reliability of the overall system, adds TDK.

The TAD2140 uses an embedded DSP from ICsense, an ASIC design specialist that TDK acquired in March 2017. The integrated static and dynamic compensation functions of the ASIC reduce design-in effort. The sensor can compensate any drifts of gain, offset or orthogonality as well as mechanical non-idealities like magnet tilt or displacement. In addition, the implemented algorithms allow higher assembly tolerances of mechanical components or increase of the system performance with existing solutions. The ASIC provides several digital outputs such as Hall emulation (UVW), encoder (ENC), pulse-width modulation (PWM), and SENT on two interfaces simultaneously. Internal diagnostic features make the TAD2140 suitable for demanding automotive applications where functional safety is required (ASIL B rating).

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