AS5035-T Просмотр технического описания (PDF) - austriamicrosystems AG
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AS5035-T Datasheet PDF : 18 Pages
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AS5035 – 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
For each misalignment step, the measurement as shown
in Figure 14 is repeated and the accuracy
(Errmax – Errmin)/2 (e.g. 0.25° in Figure 14) is entered as
the Z-axis in the 3D-graph.
The total nonlinearity error over process tolerances,
temperature and a misalignment circle radius of 0.25mm
is specified better than ±1.4 degrees.
The maximum non-linearity error on this example is
better than ±1 degree (inner circle) over a misalignment
radius of ~0.7mm. For volume production, the placement
The magnet used for these measurement was a
cylindrical NdFeB (Bomatec® BMN-35H) magnet with
6mm diameter and 2.5mm in height.
tolerance of the IC within the package (±0.235mm) must
also be taken into account.
lid 0.5
a 0.4
0.3
v 0.2
ill 0.1
0
-0.1 0°
t -0.2
G s -0.3
-0.4
A t -0.5
linearity error with centered magnet [degrees]
Err max
90°
180°
Err min
transition noise
270°
360°
Figure 14: Example of linearity error over 360°
ams nten 10.2 Transition Noise
o Transition noise is defined as the jitter in the transition
between two steps.
c Due to the nature of the measurement principle (Hall
l sensors + Preamplifier + ADC), there is always a certain
degree of noise involved.
a This transition noise voltage results in an angular
ic transition noise at the outputs. It is specified as 0.06
degrees rms (1 sigma)*1.
This is the repeatability of an indicated angle at a given
n mechanical position.
h The transition noise influences the period, width and
phase shift of the output signals A, B and Index:
c Parameter
TeIndex Pulse
width
Tolerance (1σ)
(rms)
Tolerance (3σ)
(peak)
1.406° +/-0.06° 1.406° +/-0.18°
e° = electrical degrees (see Figure 5)
*1: statistically, 1 sigma represents 68.27% of readings,
3 sigma represents 99.73% of readings.
The algorithm used to generate the incremental outputs
guarantees no missing or additional pulses even at high
speeds (up to 30,000 rpm and higher)
10.3 High Speed Operation
10.3.1 Sampling Rate
The AS5035 samples the angular value at a rate of 10k
samples per second. Consequently, the incremental
outputs are updated each 100µs.
At a stationary position of the magnet, this sampling rate
creates no additional error.
Incremental encoders are usually required to produce no
missing pulses up to several thousand rpm’s.
Therefore, the AS5035 has a built-in interpolator, which
A,B Pulse width 2.813° +/-0.06° 2.813° +/-0.18°
ensures that there are no missing pulses at the
Period
A-B Phase shift
5.625° +/-0.06°
90e° +/-1.9e°
5.625° +/-0.18°
90e° +/-5.7e°
incremental outputs for rotational speeds of up to
10,000rpm.
Table 3: Incremental signal tolerances with transition noise
Revision 1.5
www.austriamicrosystems.com
Page 9 of 17
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