KMA220 datasheet(14/36 Pages) NXP

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KMA220

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Product data sheet

Rev. 1 — 24 May 2012

14 of 36

NXP Semiconductors

KMA220

Dual channel programmable angle sensor

12. Definition of errors

12.1 General

Angular measurement errors by the KMA220 result from linearity errors, temperature drift

errors and hysteresis errors and die displacement error. Figure 6 shows the output signal

of an ideal sensor, where the measured angle



meas corresponds ideally to the magnetic

field angle

. This curve represents the angle reference line 

ref() with a slope of

0.5 %VDD/degree.

The angular range is set to



max =180 and the clamping voltages are programmed to

V(CL)l =5%VDD and V(CL)u =95%VDD for a valid definition of errors.

12.2 Hysteresis error

The device output performs a positive (clockwise) rotation and negative (counter

clockwise) rotation over an angular range of 180

 at a constant temperature.

The maximum difference between the angles defines the hysteresis error



hys.

Equation 1 gives the mathematical description for the hysteresis value



hys:

(1)

Fig 6.

Definition of the reference line

001aag812

180

α (deg)

φmeas

(deg)

φref(α)

Fig 7.

Definition of the hysteresis error

001aag813

180

α (deg)

φmeas

(deg)

Δφhys



hys



()



meas 

180



()



meas 

0



()

–

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