KMA199 datasheet(13/36 Pages) NXP

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KMA199_1

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Product data sheet

Rev. 01 — 26 April 2010

13 of 36

NXP Semiconductors

KMA199

Programmable angle sensor

12.2 Hysteresis error

The hysteresis error

Δφ

hys is defined as the maximum difference between the angles,

given by the device output when performing a positive (clockwise) rotation and negative

(counter clockwise) rotation over an angular range of 180

°, measured at a constant

temperature.

Equation 1 gives the mathematical description for the hysteresis value

Δφ

hys:

(1)

12.3 Linearity error

The KMA199 output signal deviation from a best straight line

BSL, with the same slope as

the reference line, is defined as linearity error. The magnetic field angle is varied at fixed

temperatures for measurement of this linearity error. The output signal deviation from the

best straight line at the given temperature is the linearity error

Δφ

lin. It is a function of the

magnetic field angle

α and the temperature of the device T

amb.

Fig 7.

Definition of the hysteresis error

001aag813

180

α (deg)

φmeas

(deg)

Δφhys

hys

Δα

()

meas α

180°

→

()

meas α

0°

→

()

–

Fig 8.

Definition of the linearity error

001aag814

180

α (deg)

φmeas

(deg)

Δφlin(α, Tamb)

φref(α)

φBSL(α, Tamb)

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