AS5247 14-Bit Dual-Die On-Axis Magnetic Rotary Position Sensor with 11-Bit Binary Incremental Pulse Count The AS5247 is a high-resolution redundant rotary position General Description 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 AS5247 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 AS5247 supports embedded self-diagnostics including magnetic field strength too high, magnetic field strength too low or lost magnet, and other related diagnostic features. The AS5247 is available as a dual die in a compact MLF-40 7x7 package. Ordering Information and Content Guide appear at end of datasheet. Key Benefits & Features The benefits and features of AS5247, 14-bit Dual-Die On-Axis Magnetic Rotary Position Sensor with 11-bit Binary Incremental Pulse Count are listed below: Figure 1: Added Value of Using the AS5247 Benefits Features Easy to use saving costs on DSP DAEC Dynamic angle error compensation Good resolution for motor and position control 14-bit core resolution Independent output interfaces: SPI, ABI, UVW, Versatile choice of the interface PWM ams Datasheet Page 1 v1-10 2016-Dec-05 Document FeedbackAS52 47 Gene ral Des c rip t ion Benefits Features No programmer needed (via SPI command) Zero position, configuration programmable Supports safety-critical applications Self-Diagnostics and redundancy Lower system costs (no shielding) Immune to external stray field Applications The AS5247 has been designed to support BLDC motor commutation for the most challenging and safety-critical automotive applications (AEC-Q100 grade 0 automotive qualified) such as electric power steering (EPS), transmission (gearbox, actuator), brake (actuator) and starter & alternator. Block Diagram The functional blocks of this device are shown below: Figure 2: AS5247 Block Diagram VDD3V3 T VDD3V3 B CSn T Volatile Memory CLK T SPI AS5247 MISO T OTP MOSI T CSn B VDD T LDO CLK B MISO B VDD B MOSI B A T Hall Analog ABI B T Sensors Front-End I T/PWM T Dynamic Angle A B ATAN A/D INTERPOLATOR Error B B (CORDIC) Compensation I B/PWM B U T UWV V T W T / PWM T AGC U B PWM Decoder V B Selectable On I or W W B / PWM B GND B GND T Page 2 ams Datasheet Document Feedback v1-10 2016-Dec-05
