AS5045B

AS5045B 12-Bit Programmable Magnetic Position Sensor 1 General Description The AS5045B is a contact less magnetic position sensor for 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 magnet’s angular position with a resolution of 0.0879º = 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 AS5045B to operate at either 3.3V or 5V supplies. 2 Key Features Contact less high resolution rotary position sensor over a full turn of 360 degrees Figure 1. Blockdiagram Rotary Position Sensor IC Two digital 12-bit absolute outputs: - Serial interface - Pulse width modulated (PWM) output Quadrature A/B/I output 12-bit User programmable zero position Failure detection mode for magnet placement, monitoring, and loss of power supply Red-Yellow-Green indicators display placement of magnet in Zaxis Serial read-out of multiple interconnected AS5045B devices using Daisy Chain mode Tolerant to magnet misalignment and gap variations Wide temperature range: - 40ºC to +125ºC Small Pb-free package: SSOP 16 (5.3mm x 6.2mm) 3 Applicati...