AS5306BATSU austriamicrosystems, AS5306BATSU Datasheet - Page 5

• Manufacturer Part Number: AS5306BATSU
• Description: IC, LINEAR ENCODER, 12.3BIT, 20-TSSOP
• Manufacturer: austriamicrosystems
• Type: Linear Magneticr

Specifications of AS5306BATSU

• Ic Function: Encoder IC
• Supply Voltage Range: 4.5V To 5.5V
• Operating Temperature Range: -40°C To +125°C
• Digital Ic Case Style: TSSOP
• No. Of Pins: 20
• Termination Type: SMD
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Package / Case: 20-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
7
The digital output is compatible to optical incremental
encoder outputs. Direction of rotation is encoded into
two signals A and B that are phase-shifted by 90º.
Depending on the direction of rotation, A leads B
(CW) or B leads A (CCW).
7.1.1
A single index pulse is generated once for every pole
pair. One pole pair is interpolated to 40 quadrature
pulses (160 steps), so one index pulse is generated
after every 40 quadrature pulses (see Figure 6)
The Index output is switched to Index = high, when a
magnet is placed over the Hall array as shown in
Figure 7, top graph: the north pole of the magnet is
placed over the left side of the IC (top view, pin#1 at
bottom left) and the south pole is placed over the
right side of the IC.
The index output will switch back to Index = low,
when the magnet is moved by one LSB from position
X=0 to X=X1, as shown in Figure 7, bottom graph.
One LSB is 25µm for AS5304 and 15µm for AS5306.
Note: Since the small step size of 1 LSB is hardly
recognizable in a correctly scaled graph it is shown as an
exaggerated step in the bottom graph of Figure 7.
7.1.2
The AS5304 can also provide a low magnetic field warning to indicate a missing magnet or when the end of the magnetic strip
has been reached. This condition is indicated by using a combination of A, B and Index, that does not occur in normal
operation:
A low magnetic field is indicated with:
Index = high
A=B=low
7.1.3
The recommended vertical distance between magnet and IC depends on the strength of the magnet and the length of the
magnetic pole.
Typically, the vertical distance between magnet and chip surface should not exceed ½ of the pole length.
That means for AS5304, having a pole length of 2.0mm, the maximum vertical gap should be 1.0mm,
For the AS5306, having a pole length of 1.2mm, the maximum vertical gap should be 0.6mm
These figures refer to the chip surface. Given a typical distance of 0.2mm between chip surface and IC package surface,
the recommended vertical distances between magnet and IC surface are therefore:
AS 5304: ≤ 0.8mm
AS 5306: ≤ 0.4mm
Revision 1.5
Incremental Quadrature AB Output
Index Pulse
Magnetic Field Warning Indicator
Vertical Distance between Magnet and IC
www.austriamicrosystems.com
Index
Detail:
Step #
Index
A
B
A
B
157
S
40
Figure 6:
40
158 159
1
1
N
0
Quadrature A / B and Index output
2
1
2
2
3
4
S
5
40
40
1
1
N
2
2
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