KMA200 datasheet(20/33 Pages) PHILIPS

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KMA200

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Product data sheet

Rev. 8 — 7 December 2011

20 of 33

NXP Semiconductors

KMA200

Programmable angle sensor

12.4 Microlinearity

Microlinearity is the deviation between the device output and the reference line at any

angle and for an angle step of 1

. The microlinearity is determined at a constant

temperature.

The microlinearity is calculated as follows:

lin =Vmeas(ref(i+1))  Videal(ref(i+1))

Videal(ref(i+1))= Vmeas(ref(i))+mideal  1 =Vmeas(ref(i))+0.5%VDD

lin: microlinearity

Vmeas(ref(i)): measured voltage [%VDD] for angle position ref(i)

mideal: ideal, theoretical slope; with 90 %VDD and maximum angle 180

The output slopes are monotonic by design. This figures can also be used for the

definition of

lin in digital mode, as follows: assume that

Vmeas(ref(i))= meas(ref(i)) and Vmeas(ref(i+1))= meas(ref(i+1)),

whereas



meas(X) is the output angle of the KMA200 at the angle position X.

Fig 10. Microlinearity behavior

006aaa305

voltage

Vmeas(ϕref(i+1))

Videal(ϕref(i+1))

Vmeas(ϕref(i))

theoretical slope mideal

starting at output

Vmeas(ϕref(i))

Δϕref = 1° = |ϕref(i) − ϕref(i+1)|

angle

Δϕμlin

KMA200 Datasheet(PDF) 20 Page - NXP Semiconductors