AS5040 View Datasheet(PDF) - austriamicrosystems AG

Part Name

Description

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AS5040

10-Bit 360º Programmable Magnetic Rotary Encoder

austriamicrosystems AG 

Simulation Modelling

Figure 43:

Arrangement of Hall Sensor Array on Chip (principle)

AS5040− SimulationModelling

Page 42

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With reference to Figure 43, a diametrically magnetized

permanent magnet is placed above or below the surface of the

AS5040. The chip uses an array of Hall sensors to sample the

vertical vector of a magnetic field distributed across the device

package surface. The area of magnetic sensitivity is a circular

locus of 1.1mm radius with respect to the center of the die. The

Hall sensors in the area of magnetic sensitivity are grouped and

configured such that orthogonally related components of the

magnetic fields are sampled differentially.

The differential signal Y1-Y2 will give a sine vector of the

magnetic field. The differential signal X1-X2 will give an

orthogonally related cosine vector of the magnetic field.

The angular displacement (θ) of the magnetic source with

reference to the Hall sensor array may then be modelled by:

(EQ4)

θ

=

arc

tan

(---Y-----1----–-----Y----2----)

(X1 – X2)

±

0.5°

The ±0.5° angular error assumes a magnet optimally aligned

over the center of the die and is a result of gain mismatch errors

of the AS5040. Placement tolerances of the die within the

package are ±0.235mm in X and Y direction, using a reference

point of the edge of pin #1 (Figure 43).

ams Datasheet

[v2-12] 2017-Jun-20

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