자석 로터리 위치 센서 -AS5147U
(MAGNETIC ROTARY 3 CLICK)
개요
- 본 제품은 자석 로터리 위치 센서 -AS5147U 입니다.
- SPI 설정가능한 AS5147U 로터리 위치 센서를 기반으로 디자인된 제품입니다.
- 360도 범위에서 절대각을 측정할 수 있습니다.
- 로봇 어플리케이션에서 모터의 위치 등을 측정하고자 할 경우 사용합니다.
- SPI 인터페이스를 가지고 있으며, 3.3V 시스템과 동작합니다.
특징
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Magnetic Rotary 3 Click as its foundation uses the AS5147U, a high-resolution rotary position sensor for fast absolute angle measurement over a full 360-degree range from ams AG. The AS5147U continuously generates the angle information, which the different interfaces can request from the device. The internal 14-bit resolution is available by readout register via the SPI interface, while the resolution on the ABI output can be programmed for 10 or 14 bits. It is also equipped with a Dynamic Angle Error Compensation block that corrects the calculated angle regarding latency by using a linear prediction calculation algorithm.
The core of the AS5147U represents a CMOS technology Hall-effect magnetic sensor that converts the magnetic field component perpendicular to the surface of the chip into a voltage. The signals coming from internal Hall sensors are amplified and filtered before their conversion by the ADC and then processed by the CORDIC block to compute the angle and magnitude of the magnetic field vector. The intensity of the magnetic field is used by the automatic gain control (AGC) to adjust the amplification level to compensate for temperature and magnetic field variations.
Magnetic Rotary 3 Click communicates with MCU through a standard SPI interface supporting the common SPI mode, SPI Mode 1, allowing a host MCU to read 14-bit absolute angle position data from the AS5147U. This Click board™ also comes with onboard headers reserved for incremental and commutation signals of their respective A/B/I and U/V/W signals alongside embedded self-diagnostics, including magnetic field strength too high, magnetic field strength too low or lost magnet, and other related diagnostic features. Incremental movements are indicated on ABI signals with a maximum resolution of 16384 steps / 4096 pulses per revolution.
Besides, brushless DC (BLDC) motors are also controllable through a standard UVW commutation interface with a programmable number of pole pairs from 1 to 7. At constant rotation speed, the latency time is internally compensated by the AS5147U, reducing the dynamic angle error at the SPI, ABI, and UVW outputs, while at higher speeds, the interpolator fills in the missing ABI pulses and generates the UVW signals with no loss of resolution. The AS5147U allows selection between a UVW output interface and a PWM-encoded interface on the W pin, which can be seen as an absolute angle position.
This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.
SPECIFICATIONS
Type Magnetic Applications Can be used to support BLDC motor commutation for the most challenging automotive applications On-board modules AS5147U - rotary position sensor for fast absolute angle measurement over a full 360-degree range from ams AG Key Features Good resolution for motor and position control, independent output interfaces, self-diagnostics, immune to external stray field, low power consumption, and more Interface SPI Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V
문서
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