KMA200 datasheet(18/33 Pages) PHILIPS

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KMA200

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Product data sheet

Rev. 8 — 7 December 2011

18 of 33

NXP Semiconductors

KMA200

Programmable angle sensor

12. Definition of errors

12.1 General

For the accuracy is assumed that the sensor operates in a homogeneous magnetic field at

saturation field strength Hsat. Also, the zero angle register of the KMA200 is set at a

mechanical reference point at room temperature (and zero degree).

This reference line is valid for digital and analog outputs. The maximum angle is set to

180

 and the clamping levels are programmed to V

(CL)l = 5 %VDD and V(CL)u =95 %VDD.

12.2 Linearity error

The deviation from the reference line



lin is called angle linearity error and defined as

follows:



lin = lin(ref,Tj) ref

Tj: any ambient temperature in the specific range

Following formula is used to calculate



meas in degree from an analog voltage value:

(3)

VOUT: analog output of KMA200 [%VDD]

For sensors the error of the analog output



lin is only defined in the range from 5.5 %VDD

to 94.5 %VDD.



ref: reference angle in degree



meas: measured angle of the KMA200 in degree



lin: deviation from reference line in degree

Fig 8.

Visualization of linearity behavior

006aaa303

180

output

reference line

ϕmeas

(

°)

ϕref (°)

Δϕlin



meas

OUT

5 %V

–

95 %V

5 %V

–

-------------------------------------------------- 180





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