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

Short Description

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.

Block diagram – system architecture

Main features

Support of various TMR full- and half-bridges from TDK
Optimized signal conditioning for TMR signals, like output gain, offset, 0-angle and orthogonality correction
Easy-to-use differential or single-ended SIN/COS outputs for remote sensing applications with best-in-class EMC performance
Fast response time of max. 3 µs and high output bandwidth for applications up to 650,000 rpm
Various analog output configurations
Differential or single-ended SIN/COS analog output signals
Non-ratiometric or ratiometric analog outputs related to the supply voltage
SEooC ASIL B ready according to ISO 26262:2018 to support Functional Safety applications (Metrics (PMHF, SPFM, LFM) according to ASIL C)
Intrinsic signal conditioning with on-chip calibration and integrated safety monitoring reduce effort on ECU side
Flux-less self-test: Triggered or at IC start-up for testing of the signalpath during production or in application
Operates from 3.0 V up to 5.5 V supply voltage
Low current consumption of typ. 5.5 mA
Operates from –40 °C up to 170 °C junction temperature (Max. Ambient Temperature: T_A,absmax = 160 °C)
Programming via the IC’s output pin. No additional programming pin required
Under- and overvoltage detection of V_SUP
Passive wire-break detection working with external pull-up or pull-down resistor
On-chip temperature sensor for overtemperature supervision
Integrated, protected supply for the external TMR bridges
Various integrated supervision features of the external TMR bridges
Small 3 × 3 mm² DFN12 SMD package
AEC-Q100 qualification