Position sensor features improved accuracy and functional safety

Article By : Carolyn Mathas

The signal-conditioning IC for automotive and industrial applications can scale setups depending on accuracy, EMC or safety requirements.

Expanding its existing tunnel magneto-resistance (TMR) sensor portfolio, TDK has added the ASA 2310 high-performance TMR analog front-end IC for high-speed automotive and industrial electric motor applications.

ASA 2310 is designed to reduce noise and parasitic components that occur during remote application setups when the sensor module is separate from the ECU and connected by a long wire-harness. When used with TDK’s TMR TAS sensor family, users can commercially scale application setups depending on accuracy, EMC or functional safety requirements as the ASA 2310 can operate up to four TMR half-bridge sensors simultaneously.

Rotor position sensor solutions based on ASA 2310 combine high resolution and accurate position measurement at rotation speeds of up to 650,000 rpm. ASA 2310’s high-robust output buffer offers easy-to-use differential or single-ended SIN/COS outputs for remote sensing applications with robust EMC performance. Moreover, rotor position sensing based on ASA 2310 analog TMR sensors results in smaller, flexible sensor systems over inductive resolvers.

ASA 2310 signal-conditioning IC is offered in a compact 3 x 3 mm DFN12 SMD package. Source: TDK-Micronas GmbH

The ASA 2310 TMR front-end is customer programmable by modulation of output voltage without requiring an additional programming pin. Such characteristics as gain, offset, zero-angle, and orthogonality are adjustable using the integrated signal path by programming the non-volatile memory of the device. Different coarse gain settings ensure that ASA 2310 supports a variety of TMR full- and half-bridge devices from TDK. The amplified single or differential ended output signals of ASA 2310 can, with high accuracy, calculate the rotation angle of a magnet by employing an external analog-to-digital converter (ADC) and an electronic control unit (ECU).

Featuring an optional and unique fluxless self-test, ASA 2310 allows a system to test the full signal path inside the device. During setup, the test can be used to check the complete signal-path integrity, including wiring, external output capacitors and ECU. The IC is defined as Safety Element out of Context (SEooC) ASIL B ready according to ISO 26262 functional safety standard. Additionally, ASA 2310 provides a single-point fault metric (SPFM) of more than 97%, exceeding ASIL B classification requirements.

Samples of ASA 2310 are available now. ASA 2310 signal-conditioning IC is offered in a very compact 3 x 3 mm DFN12 SMD package. A reference evaluation board complete with magnet design and sensor-plus-signal conditioning chipset is available on request.

 

This article was originally published on Planet Analog.

Carolyn Mathas has 15 years of journalism experience, the last seven of which have been spent on the EE Times Group’s DesignLines, including PLDesignLine, Network Systems DesignLine, Mobile Handset DesignLine, and her current sites, Industrial Control DesignLine and CommsDesign. Prior to joining UBM in 2005, she was a senior editor at Lightwave Magazine and a correspondent for CleanRooms Magazine. Mathas has a BS in marketing from University of Phoenix and an MBA from New York Institute of Technology. She lives in the Sierra foothills and claims that the pine forest, snow, mountain air, bears, and power outages balance her deadline-packed high-tech career.

 

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