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KMA221 Scheda tecnica(PDF) 5 Page - NXP Semiconductors

Il numero della parte KMA221
Spiegazioni elettronici  Programmable angle sensor
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KMA221
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 1 — 16 July 2013
5 of 36
NXP Semiconductors
KMA221
Programmable angle sensor
Since the Anisotropic MR (AMR) effect is periodic over 180
, the sensor output is also
180
-periodic. The angle is calculated relative to a freely programmable zero angle. The
dashed line indicates the mechanical zero degree position.
6.
Analog output
The KMA221 provides one analog output signal on pin OUT/DATA. The measured angle
 is converted linearly into a value, which is ratiometric to the supply voltage V
DD. Either a
positive or a negative slope is provided for this purpose.
Table 3 describes the analog output behavior for a positive slope. For example, if
a magnetic field angle, above the programmed maximum angle
max but below the clamp
switch angle
sw(CL), is applied to the sensor, the analog output is set to the upper
clamping voltage. If the magnetic field angle is larger than the clamp switch angle, the
analog output switches from upper to lower clamping voltage. If there is a negative slope,
the clamping voltages are changed.
The analog output voltage range encodes both angular and diagnostic information. A valid
angle value is between the upper and lower clamping voltage. If the analog output is in the
diagnostic range, that is below 4 %VDD or above 96 %VDD, an error condition has been
detected. The analog output repeats every 180
.
Fig 2.
Angular measurement directions
008aaa276
α
Hext
4
3
2
1
Table 3.
Analog output behavior for a positive slope
Magnetic field angle
Analog output
max <  < sw(CL)
V(CL)u
sw(CL) <  < ref + 180
V(CL)l


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