AS5045-ASST datasheet(33/47 Pages) AMSCO

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[v2-01] 2017-Jul-13

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AS5045 − Detailed Description

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.

Figure 33:

Example of Linearity Error over 360°

Transition Noise

Transition noise is defined as the jitter in the transition between

two steps. Due to the nature of the measurement principle (Hall

sensors + Preamplifier + ADC), there is always a certain degree

of noise involved. This transition noise voltage results in an

angular transition noise at the outputs. It is specified as 0.06

degrees rms (1 sigma)1 in fast mode (pin MODE = high) and 0.03

degrees rms (1 sigma) in slow mode (pin MODE = low or open).

This is the repeatability of an indicated angle at a given

mechanical position.

1. Statistically, 1 sigma represents 68.27% of readings, 3 sigma represents 99.73% of readings.

Linearity error with centered magnet [degrees]

-0.5

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

109

163

217

271

325

379

433

487

541

595

649

703

757

811

865

919

973

transition noise

Errmax

Errmin

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