AS5020

Rev. n/c

Page 3/11

Feb 2001

Functional Description

Measurement Principle

A hall sensor array is used to convert the magnetic field distribution above the chip surface into

a binary code.

Measurement is enabled by PD/CS=0. After each measurement a 6-bit value is latched, with

the first falling edge of the CLK, into an output shift register.

The measured data is accessible via a Synchronous Serial Interface (SSI) by any

µController

System.

Ratiometric measurement techniques together with hall sensor conditioning circuitry allow

robust tolerance to magnet misalignment.

Permanent Encoder Magnet

A simple two-pole magnet, e.g. a standard cylindrical permanent magnet that is diametric

magnetised, is needed.

Magnetic Field strength of at least

±30mTp is required at the package surface.

Standard magnet materials like rare earth AlNiCo / SmCo5 or NdFeB are recommended.

Please enquire for distributor references.

α

30

3mm

180

°

360

°

B/mT

α/°

-30

N

S

N

S