Flexible TMR Analog Front-End IC for High-Speed Angle Sensing Applications

ASA 2310 is a high-performance TMR analog front-end IC for high-speed angle sensing applications with rotation speeds of up to 650,000 rpm.

The ASA 2310 is designed to interface the high-precision analog TMR sensors of the TAS family. The sensor interface provides two differential inputs for sine and cosine TMR resistive bridges, respectively. The integrated sine and cosine channels of ASA 2310 have their own programmable gain amplifier (PGA), which are used as a low-noise instrumentation amplifier for the TMR sensor signals. Several coarse gain settings ensure that the device can support various TMR full- and half-bridges from TDK. The output buffer amplifies the signal even further and acts as buffer for the external load.

The ASA 2310 offers an intrinsic signal conditioning with on-chip calibration, which reduces effort on ECU side. The device can compensate for the main sensor and magnetic system non-idealities, like offset error, amplitude mismatch and orthogonality error. In addition, it is possible to define the angular reference position (0-angle) for the sine and cosine output signals. This allows the compensation of mechanical twist between magnet and sensor at module level. The conditioned signals can be output as differential or single-ended analog sine and cosine output signals. These signals allow the user to calculate the angle with very high accuracy by an external A/D-converter and a microcontroller/ECU.

The ASA 2310 is programmable by modulation of the output voltage. No additional programming pin is needed and fast end-of-line programming is enabled.

This product is defined as SEooC (Safety Element out of Context) ASIL B ready according to ISO 26262:2018 (Metrics (PMHF, SPFM, LFM) according to ASIL C). ASA 2310 contains integrated safety monitorings, such as overvoltage and undervoltage detection as well as wire-break monitoring during normal operation

The signal-conditioning IC is available in a very compact 3 x 3 mm DFN12 SMD package.