AS5035 austriamicrosystems, AS5035 Datasheet - Page 4

• Manufacturer Part Number: AS5035
• Description: IC, MAGNETIC ROTARY ENCODER 8BIT SSOP-16
• Manufacturer: austriamicrosystems
• Type: Magnetic Rotary Encoderr

Specifications of AS5035

• Ic Function: Encoder IC
• Supply Voltage Range: 3.3V, 5V
• Operating Temperature Range: -40°C To +125°C
• Digital Ic Case Style: SSOP
• No. Of Pins: 16
• Filter Terminals: SMD
• No. Of Bits: 8 Bit
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AS5035 – 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
5.5
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.
off = open-drain output transistor is off. Using a pull-up resistor, the output is high
on = open-drain output transistor is on. Using a pull-up resistor, the output is low
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
out of range.
6
6.1
The phase shift between channel A and B indicates the
direction of the magnet movement. Channel A leads
channel B at a clockwise rotation of the magnet (top view,
magnet placed above or below the device) with 90
electrical degrees. Channel B leads channel A at a
counter-clockwise rotation. The Index pulse has a width of
1LSB = 1.4°
power-up
Revision 1.5
Index
A
B
Incremental Outputs
CSn
MagInc and MagDec Indicators
A, B and Index
MagINC
off
off
on
on
1.40625°
MagDEC
t
=90e°
Incremental outputs valid
off
on
off
on
Description
No distance change. Magnetic Input Field OK
Distance increase (Magnet pulled away from IC)
Distance decrease (Magnet pushed towards IC)
Magnetic Input Field invalid – out of range:
either too large (magnet too close) or too small (missing magnet or magnet too far away)
5.625°
=360e°
Table 2: Magnetic field strength diagnostic outputs
Figure 5: Incremental quadrature outputs
www.austriamicrosystems.com
Zero Position
Mechanical
Hysteresis =0.7°
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:
6.2
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).
.
Rotation Direction
Hysteresis
Change
Zero Position
Mechanical
1.40625°
Index=
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