Technologies & Products Press Conference 2014 Superior TMR angle sensing for automotive systems Martin Appel Electronic Components Sales & Marketing Group November 12, 2014 Rising requirements for automotive angle measurement Applications Throttle valve Wipers Steering (EPS motor) Accuracy of conventional products Future requirements ±2° to ±3° ±1° ±0.6° ±1.2° (20 to 130 mT) (20 to 130 mT) ±0.6° (20 to 80 mT) ±0.3° (20 to 80 mT) Redundancy ISO 26262 Needed: The accuracy of angle measurements in automotive applications must be doubled! Technologies & Products Press Conference 2014 • Superior TMR angle sensing for automotive systems © TDK 2014 CC • 11/14 • 2 Evolution of magneto resistive sensor technologies MR ratio [%] Output [mV] SNR @ 10 kHz [dB] Output shift from 25 °C to 125 °C [%] AMR 3 90 72 -29 GMR 12 360 77 -23 TMR 100 3000 96 -13 AMR Free layer GMR Free layer Shunt layer Pin layer TMR Current Free layer Barrier layer Pin layer Current Current TMR output • more than 30 times higher than AMR • 8 times higher than GMR • smaller thermal coefficient factor for a broad temperature range Technologies & Products Press Conference 2014 • Superior TMR angle sensing for automotive systems © TDK 2014 CC • 11/14 • 3 Steering – the most demanding angle sensor application EPS motor 2-pole magnet TMR angle sensor EPS system Steering angle sensor TMR sensor is positioned on the opposite side of a 2-pole magnet. Technologies & Products Press Conference 2014 • Superior TMR angle sensing for automotive systems © TDK 2014 CC • 11/14 • 4 Superior performance of TDK TMR angle sensors Output waveform 1.6 AMR sin GMR sin TMR sin AMR cos GMR cos TMR cos • Higher output 3.0 Vpp @ 5 V (30x AMR, 8x GMR) 1.2 TMR Output [V] 0.8 GMR AMR 0.4 0 • Greater angle accuracy Angle accuracy of less than ±0.6° over a wide range of magnetic field strengths and temperatures (20 mT to 80 mT, -40 °C to 150 °C) -0.4 • Lower power consumption 5 mW under recommended operating conditions -0.8 -1.2 -1.6 0 90 180 Angle [°] 270 360 Technologies & Products Press Conference 2014 • Superior TMR angle sensing for automotive systems © TDK 2014 CC • 11/14 • 5 TMR angle sensors for automotive applications TAS2004 TAS4501 • 2 x 2 directions • 4 full bridges • Redundancy (ISO 26262) • 2 directions • 2 full bridges Output Package ATAS2001 • • • • 2 directions 2 full bridges plus ASIC Redundancy (ISO 26262) Analog Analog Digital TSSOP8 VSOP16 SSOP16 6.40 mm 1 1 V Sin 4 Cos Cos- Sin+ V Cos G Sin Cos+ 8 5 8 Dimensions 3.0 x 4.4 x 1.1 mm G1 Cos V1 Sin Cos1- Sin1+ G1 Sin V1 Cos Sin2- G2 Cos 16 4.40 mm Cos1+ V2 Sin Cos2- Sin2+ V2 Cos G2 Sin Cos2+ 5.00 mm Pin configuration Sin- Sin1- ASIC 9 5.1 x 4.4 x 1.15 mm Technologies & Products Press Conference 2014 • Superior TMR angle sensing for automotive systems 6.4 x 5.0 x 1.15 mm © TDK 2014 CC • 11/14 • 6 TAS2004: 2 directions, 2 full bridges, analog • Four output waveforms (sin+, sin-, cos+, cos-) are created when the 2-pole magnet rotates • Angle accuracy of less than ±0.6° @ 20 mT to 80 mT and -40 °C to 150 °C • TSSOP8 package (3.0 mm x 4.4 mm x 1.1 mm) Circuit Output waveform 8 7 6 5 N S S N S N V Cos sin- sin+ Cos+ G S 1 G Output [V] V N S N Ch 1 (sin) 0 Ch 2 (cos) -1 1 2 3 4 0 90 180 270 360 Angle [°] Technologies & Products Press Conference 2014 • Superior TMR angle sensing for automotive systems © TDK 2014 CC • 11/14 • 7 TAS4501: 2x 2 directions, 4 full bridges, analog • 8 output waveforms (2x sin+, sin-, cos+, cos-) are created when the 2-pole magnet rotates • Angle accuracy of less than ±0.6° @ 20 mT to 80 mT and -40 °C to 150 °C • VSOP16 package (5.1 mm x 4.4 mm x 1.15 mm) Circuit Output waveform sin 1 16 15 cos 1 14 13 sin 2 12 cos 2 11 10 N S S N S N N 9 S S N 1 sin+ V V Cos sin- sin+ Cos sin- Cos+ G sin 1 V Cos+ G G G Output [V] V cos 1 0 sin 2 cos 2 -1 1 2 3 4 5 6 7 8 0 90 180 270 360 Angle [°] TAS4501 angle sensor offers redundancy in a single component. Technologies & Products Press Conference 2014 • Superior TMR angle sensing for automotive systems © TDK 2014 CC • 11/14 • 8 ATAS2001 includes ASIC for digital output High-precision digital angle sensor with signal conditioning and redundancy in a single component and support for ISO 26262 Features 6.40 mm 4.40 mm 5.00 mm ASIC • • • • • • • • • High output based on TMR technology Angle accuracy of ≤ ±0.2° in auto-calibration mode High SNR Minimal drift over wide temperature range of -40 °C to +150 °C Magnetic field range of 20 mT to 80 mT Error compensation mode Digital output for all standard protocols 14-bit A/D converter SSOP16 package (6.4 mm x 5.0 mm x 1.15 mm) Error compensation significantly improves angle measurement accuracy. Technologies & Products Press Conference 2014 • Superior TMR angle sensing for automotive systems © TDK 2014 CC • 11/14 • 9 Customer benefits of TDK’s TMR angle sensors • Highest measurement accuracy • Sensor ouput many times higher than conventional products • Very small temperature drift over a broad range of magnetic field strengths • Low power consumption • Redundancy available in a single component • TDK supports ISO 26262 requirements Superior performance Technologies & Products Press Conference 2014 • Superior TMR angle sensing for automotive systems © TDK 2014 CC • 11/14 • 10 www.global.tdk.com • www.epcos.com