OSRAM AS5147-TS_EK_AB

The AS5147 is a high-resolution rotary position sensor for fast absolute angle measurement over a full 360-degree range. This new position sensor is equipped with a revolutionary integrated dynamic angle error compensation (DAEC™) with almost 0 latency. The robust design of the device suppresses the influence of any homogenous external stray magnetic field. A standard 4-wire SPI serial interface allows a host microcontroller to read 14-bit absolute angle position data from the AS5147 and to program non-volatile settings without a dedicated programmer. Incremental movements are indicated on a set of ABI signals with a maximum resolution of 2048 steps / 512 pulses per revolution. The resolution of the ABI signal is programmable to 1024 steps / 256 pulses per revolution. Brushless DC (BLDC) motors are controlled through a standard UVW commutation interface with a programmable number of pole pairs from 1 to 7. The absolute angle position is also provided as PWM-encoded output signal. The AS5147 supports embedded self-diagnostics including magnetic field strength too high, magnetic field strength too low or lost magnet, and other related diagnostic features. The product is defined as SEooC (Safety Element out of Context) according ISO26262 including FMEDA, safety manual and third party qualification. The AS5147 is available as a single die in a compact 14-pin TSSOP package.

The AS5147 is a Hall-effect magnetic sensor using a CMOS technology. The Hall sensors convert the magnetic field component perpendicular to the surface of the chip into a voltage. The signals from the Hall sensors are amplified and filtered by the analog front-end (AFE) before being converted by the analog-to-digital converter (ADC). The output of the ADC is processed by the hardwired CORDIC (coordinate rotation digital computer) block to compute the angle and magnitude of the magnetic vector. The intensity of the magnetic field (magnitude) is used by the automatic gain control (AGC) to adjust the amplification level for compensation of the temperature and magnetic field variations. The AS5147 generates continuously the angle information, which can be requested by the different interfaces of the device. The internal 14-bit resolution is available by readout register via the SPI interface. The resolution on the ABI output can be programmed for 10 or 11 bits. The Dynamic Angle Error Compensation block corrects the calculated angle regarding latency, by using a linear prediction calculation algorithm. At constant rotation speed the latency time is internally compensated by the AS5147, reducing the dynamic angle error at the SPI, ABI and UVW outputs. The AS5147 allows selecting between a UVW output interface and a PWM-encoded interface on the W pin. At higher speeds, the interpolator fills in missing ABI pulses and generates the UVW signals with no loss of resolution. The non-volatile settings in the AS5147 can be programmed through the SPI interface without any dedicated programmer.

• BLDC motor commutation for automotive applications (AEC-Q100 grade 0 automotive qualified)
• Electric power steering (EPS)
• Transmission (gearbox, actuator)
• Pump
• Brake (actuator)
• Starter and alternator