TMR angle sensor targets PCB-less applications

TMR angle sensor targets PCB-less applications

New Products |
By Christoph Hammerschmidt

The device includes two full TMR bridges, a dedicated ASIC for signal conditioning and integrated passive components. Like all of TDK’s TMR sensors, the TAD2140 features an angle accuracy of ±0.2 °, achieving the world’s smallest angle error of only ±0.05 ° at room temperature. The sensors are capable of contactless sensing from 0° to 360° over a temperature range of −40 °C to +150 °C. The sensor’s fast response, high angular accuracy, and advanced compensation algorithms make it ideal for the optimization of motor control applications such as BLDC motor commutation. Thanks to its small package size, the sensor is suited for applications with limited available space, such as steering motor commutation.

The TAD2140 uses an embedded DSP from ICsense, an ASIC design specialist acquired by TDK in March 2017. Thanks to the integrated static and dynamic compensation functions of the ASIC, design-in effort is considerably reduced. 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. Furthermore, its various internal diagnostic features make it suitable for demanding automotive applications where functional safety is required (ASIL B rating).

The TAD2140 comes in a TO-6 package that 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, thus reducing total system size and cost.

Samples will be available from the third quarter of 2018. Start of production is planned for the third quarter of 2019.

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