KMA220
NXP Semiconductors
Dual channel programmable angle sensor
This error comprises non-linearity and temperature drift related to the room temperature.
|Δφ
ang
|
m
ang
|Δφ
ang(peak)
|
|Δφ
μlin
+ Δφ
|
temp|RT
−α*
α
− 1°
α
0
+ 1°
+α*
0
0
α
1
α
001aal766
Fig 11. Envelope curve for the magnitude of angular error
Figure 11 shows the envelope curve for the magnitude of angular error |ang| versus 1
for all angles 0 and all temperatures Tamb within the ambient temperature range. If 1 is
in the range of 1 around 0, |ang| has its minimum. Here only the microlinearity error
lin and the temperature drift related to the room temperature |tempRT| occurs. If 1
deviates from 0 by more than 1 in either direction, |ang| can increase. Slope mang
defines the gradient.
Equation 5 to Equation 8 express the angular error:
for |1 0| 1
ang = lin + temp RT
(5)
for 1 < |1 0| < *
ang = lin + temp RT + mang 1 – 0 – 1
(6)
(7)
for |1 0| *
ang
=
lin2 + temp RT2
with:
ang(peak) – lin + temp RT
-----------------------------------------------------------------------------------
mang
=
+ + 1
(8)
0
KMA220
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© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 1 — 24 May 2012
17 of 36
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