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
5.5 MagInc and MagDec Indicators
These two pins are open-drain outputs with a maximum
driving capability of 2mA @ 3.0V and 4mA @ 4.5V.
MagINC, (Magnitude Increase) turns on, when the magnet
is pushed towards the IC, thus when the magnetic field
strength is increasing.
MagDEC, (Magnitude Decrease) turns on, when the
magnet is pulled away from the IC, thus when the magnetic
field strength is decreasing.
If both outputs are low, they indicate that the magnetic
field out of the allowed range:
MagINC MagDEC Description
off
off
No distance change. Magnetic Input Field OK
off
on
Distance increase (Magnet pulled away from IC)
on
off
Distance decrease (Magnet pushed towards IC)
lid on
on
Magnetic Input Field invalid – out of range:
either too large (magnet too close) or too small (missing magnet or magnet too far away)
Table 2: Magnetic field strength diagnostic outputs
a off = open-drain output transistor is off. Using a pull-up resistor, the output is high
v on = open-drain output transistor is on. Using a pull-up resistor, the output is low
ill Both outputs MagInc and MagDec may be tied together, using one common pull-up resistor. In this case, the output will be high
only when the magnetic field is in range. It will be low when either the magnet is moving in Z-axis or when the magnetic field is
t out of range.
G s 6 Incremental Outputs
6.2 Hysteresis
A t 6.1 A, B and Index
s n The phase shift between channel A and B indicates the
e direction of the magnet movement. Channel A leads
m t channel B at a clockwise rotation of the magnet (top view,
magnet placed above or below the device) with 90
a n electrical degrees. Channel B leads channel A at a
counter-clockwise rotation. The Index pulse has a width of
l co 1LSB = 1.4°
To avoid flickering of the incremental outputs at a
stationary mechanical position, a hysteresis of 0.7° is
introduced. When the direction of rotation is reversed, the
incremental outputs will not change state unless the
movement in the opposite direction is larger than the
hysteresis. This leads to the effect that the A,B and Index
pulse positions will be shifted by 0.7° when the rotational
direction is reversed. This shift is cancelled again with the
next reversal of direction so that the A,B and Index pulses
appear always at the same position for a given rotational
direction no matter how often the rotational direction is
reversed (see Figure 5).
.
a Mechanical
ic Zero Position
Rotation Direction Mechanical
Change
Zero Position
A
n B
Tech Index
1.40625°
=90e°
5.625°
=360e°
Hysteresis =0.7°
Index=
CSn
1.40625°
power-up
t Incremental outputs valid
Revision 1.5
Figure 5: Incremental quadrature outputs
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