AEAT-84AD-LBSF0 Avago Technologies US Inc., AEAT-84AD-LBSF0 Datasheet - Page 4

• Manufacturer Part Number: AEAT-84AD-LBSF0
• Description: Quadrant/Circular Detector,Module C
• Manufacturer: Avago Technologies US Inc.
• Series: AEAT-84ADr

Specifications of AEAT-84AD-LBSF0

• Encoder Type: Optical
• Output Type: Gray Code (Absolute)
• Pulses Per Revolution: 16384
• Voltage - Supply: 5VDC
• Actuator Type: 10mm Geared Center
• Detent: No
• Built In Switch: No
• Mounting Type: Chassis Mount
• Termination Style: Pin Strip
• Output: Digital
• Operating Temperature Range: - 40 C to + 125 C
• Product: Optical
• Technology: Rotary
• Detents: No
• Motion: Rotary
• Index Output: Not Indexed
• Encoder Signal: Digital Square Wave
• Shaft Style: Hollow
• Operating Temperature Min Deg. C: -40C
• Operating Temperature Max Deg. C: 125C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Orientation: -
• Rotational Life (cycles Min): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Gray code-generation
For the readout schematic of the
multi-turn code gears, i.e. with the
user’s microcontroller, there must
be a logical replication of the V-bit
multiplexers. This can be done by a
bit manipulation or by look up
tables. Care needs to be taken with
the real time readout conditions.
The procedure is as follows :
1. The 3 bits ( MTDAT[2:0] ) of each
2. Synchronous to the readout of
3. The bit change of the complete
The logic diagram for ONE gear is
shown in the following diagram (V-
bit-Multiplexer), Figure 4.
4
gear (C1[2:0] to C7[2:0]) are
continuously de-multiplexed.
Thus there are maximal 3 bits x
7gears = 21-bit AEAT-84AD data
in parallel.
the single turn absolute encoder,
those
(depending on the MSB bit, i.e.
SEL-bit, of the single turn
encoder)
complemented to the complete
Gray code word (cascading).
Gray code will be synchronized
by the single turn absolute
encoder and thus electronically
eliminating gear play.
AEAT-84AD
needs
to
bits
be
Logic Diagram
Figure 4. Logic Diagram and Truth Table for one of the gear wheels
From MTDAT-Demux
(Code-Wheel x)
Cx[2]
Cx[1]
Cx[0]
SEL
SEL
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Cx[0]
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
XOR
Cx[1]
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
Cx[2]
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
1
0
1
S
S
D1
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
Y
Y
D2
4x MUX2
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
1 S
0
1 S
V2
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Y
Y
V2
(V-Bit2)
D2
(Data-Bit2)
D1
(Data-Bit1)