AS5043

Data Sheet – Angular Output Tolerances

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Revision 1.80

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18 Angular Output Tolerances

18.1 Accuracy; Digital Outputs

Accuracy is defined as the error between measured angle and 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

degrees @ 25°C (see Figure 23).

Misalignment of the magnet further reduces the accuracy. Figure 22 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 2x2 mm (79x79mil) with a step size of 100µm.

For each misalignment step, the measurement as shown in Figure 23 is repeated and the accuracy

18.2 Accuracy; Analog Output

The analog output has the same accuracy as the digital output with the addition of the nonlinearities of the DAC and the

OPAMP (+/-1LSB; see Table 5 and 0).

Figure 22: Example of Linearity Error over XY Misalignment

-1000

-700

-400

-100

200

500

800

0

1

2

3

4

5

6

°

x

y

Linearity Error over XY-misalignment [°]

The maximum non-linearity error on this example is better than

±1 degree (inner circle) over a misalignment radius of

~0.7mm. For volume production, the placement tolerance of the IC within the package (

±0.235mm) must also be taken

into account.

The total nonlinearity error over process tolerances, temperature and a misalignment circle radius of 0.25mm is specified

better than

±1.4 degrees.

The magnet used for this measurement was a cylindrical NdFeB (Bomatec® BMN-35H) magnet with 6mm diameter and

2.5mm in height.