KMA220
NXP Semiconductors
Dual channel programmable angle sensor
α
H
ext
008aaa276
1
2
3
4
Fig 2. Angular measurement directions
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 KMA220 provides two analog output signals on pin OUT1/DATA1 and on
pin OUT2/DATA2. The measured angle is converted linearly into a value, which is
ratiometric to the supply voltage VDD. Either a positive or a negative slope can be
programmed independently for each pin by the customer for this purpose.
Table 3 describes the analog output behavior for a positive slope. If for example,
a magnetic field angle, above the programmed maximum angle max, but below the clamp
switch angle sw(CL) is applied to the sensor, then 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.
Table 3.
Analog output behavior for a positive slope
Magnetic field angle
Analog output
V(CL)u
max < < sw(CL)
sw(CL) < < ref + 180
V(CL)l
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.
KMA220
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 1 — 24 May 2012
5 of 36
NXP [ NXP ]
