The AS5045 is a contactless magnetic rotary encoder for accurate angular measurement over a full turn of 360°. It is a system-on-chip, combining integrated Hall elements, analog front end and digital signal processing in a single device.
The AS5045 provides contact‑less magnetic rotary encoding over a full 360° turn with a resolution of 0.0879° (4096 positions per revolution). It integrates Hall elements, an analog front‑end, and digital signal processing in a single SSOP‑16 package, and can operate from 3.3 V to 5 V supplies.
Key features include dual absolute outputs (serial SSI and PWM), user‑programmable zero position, daisy‑chain capability, and tolerance to magnet mis‑alignment. The device supports both slow (high‑accuracy) and fast (high‑speed) modes, and can generate an analog voltage by low‑pass filtering the PWM output for direct potentiometer replacement.
| Angular resolution | 0.0879° (4096 positions per revolution) |
|---|---|
| Supply voltage | 3.3 V to 5 V (operates from 3.0 V to 5.5 V) |
| Operating temperature range | -40 °C to +125 °C |
| Package | SSOP‑16, 5.3 mm × 6.2 mm, Pb‑free |
| Maximum speed (slow mode) | 38 rpm at 4096 samples/rev |
The encoder provides a resolution of 0.0879°, which corresponds to 4096 distinct positions per full turn.
The device operates from 3.3 V up to 5 V (specified supply range 3.0 V to 5.5 V).
Each additional device adds 19 bits to the serial stream; for example, two devices produce a 38‑bit stream, three devices 57 bits, and so on.