AS5145B-HSST STMicroelectronics

AS5145H/AS5145A/ AS5145B 12-Bit Programmable Magnetic Rotary Encoder The AS5145 is a contactless magnetic rotary encoder for General Description accurate angular measurement over a full turn of 360 degrees. It is a system-on-chip, combining integrated Hall elements, analog front end and digital signal processing in a single device. To measure the angle, only a simple two-pole magnet, rotating over the center of the chip, is required. The magnet can be placed above or below the IC. The absolute angle measurement provides instant indication of the magnets angular position with a resolution of 0.0879 = 4096 positions per revolution. This digital data is available as a serial bit stream and as a PWM signal. An internal voltage regulator allows the AS5145 to operate at either 3.3V or 5V supplies. Ordering Information and Content Guide appear at end of datasheet. Key Benefits & Features The benefits and features of AS5145H/AS5145A/AS5145B, 12-Bit Programmable Magnetic Rotary Encoder are listed below: Figure 1: Added Value of Using AS5145 Benefits Features Contactless high resolution rotational position encoding Highest reliability and durability over a full turn of 360 degrees Simple programming Simple user-programmable zero position and settings Serial communication interface (SSI) Multiple interfaces 10-bit pulse width modulated (PWM) output Quadrature A/B and Index output signal Ideal for motor applications Rational speeds up to 30,000 rpm Failure detection mode for magnet placement monitoring Failure diagnostics and loss of power supply Serial read-out of multiple interconnected AS5145 devices Easy setup using Daisy Chain mode ams Datasheet Page 1 v2-00 2016-Feb-05 Document FeedbackAS51 45H /AS5 14 5A/AS5 145 B Ge n e r a l De s c ri p t i o n Benefits Features Detects movement of magnet in Z-axis (Red-Yellow-Green Great flexibility at a huge application area indicator) Fully automotive qualified AEC-Q100, grade 0 Small form factor SSOP 16 (5.3mm x 6.2mm) Robust environmental tolerance Wide temperature range: -40C to 150C Applications The device is ideal for industrial applications like contactless rotary position sensing and robotics automotive applications like steering wheel position sensing, transmission gearbox encoder, head light position control, torque sensing, valve position sensing and replacement of high end potentiometers. Block Diagram The functional blocks of this device are shown below: Figure 2: AS5145 Automotive Rotary Encoder IC VDD3V3 MagINCn MagDECn VDD5V LDO 3.3V PWM PWM Interface Sin Ang DO DSP Absolute Cos Mag Hall Array Interface CSn & (SSI) Frontend CLK Amplifier OTP PDIO Register DTEST1 A Incremental Mux DTEST2 B AS5145 Interface Mode Index Page 2 ams Datasheet Document Feedback v2-00 2016-Feb-05