AS5140H datasheet(40/55 Pages) AMSCO

40 / 55 page

Page 40

ams Datasheet

Document Feedback

[v1-09] 2018-Feb-20

AS5140H − Detailed Description

Angular Output Tolerances

Accuracy

Accuracy is defined as the error between the measured angle

and the actual angle. It is influenced by several factors:

• The non-linearity of the analog-digital converters

• Internal gain and mismatch errors

• Non-linearity due to misalignment of the magnet

As a sum of all these errors, the accuracy with centered magnet

= (Errmax – Errmin)/2 is specified as better than ±0.5 degrees @

25ºC (see Figure 44). Misalignment of the magnet further

reduces the accuracy. Figure 43 shows an example of a

3D-graph displaying non-linearity over XY-misalignment. The

center of the square XY-area corresponds to a centered magnet

(see dot in the center of the graph). The X- and Y- axis extends

to a misalignment of ±1mm in both directions. The total

misalignment area of the graph covers a square of 2mm x 2mm

(79mil x 79 mil) with a step size of 100μm. For each

misalignment step, the measurement as shown in Figure 44 is

repeated and the accuracy (Errmax – Errmin)/2 (e.g. 0.25º in

Figure 44) is entered as the Z-axis in the 3D-graph.

Figure 43:

Example of Linearity Error Over XY Misalignment

-1000

-700

-400

-100

200

500

800

AS5140H Datasheet(PDF) 40 Page - ams AG