AEDS-9240-Y00 Avago Technologies US Inc., AEDS-9240-Y00 Datasheet - Page 2

• Manufacturer Part Number: AEDS-9240-Y00
• Description: Z12, 6Ch-720CPR Encoder
• Manufacturer: Avago Technologies US Inc.
• Series: AEDS-9240r

Specifications of AEDS-9240-Y00

• Encoder Type: Optical
• Output Type: Quadrature with Index (Incremental)
• Pulses Per Revolution: 720
• Voltage - Supply: 5VDC
• Actuator Type: Codewheel Not Included
• Detent: No
• Built In Switch: No
• Mounting Type: Chassis Mount
• Termination Style: Terminal Pins
• Product: Optical
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Orientation: -
• Rotational Life (cycles Min): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Theory of Operation
The AEDS-9240 optical encoder is an emitter/detector
module. Coupled with a codewheel, these modules trans-
late the rotary motion of a shaft into a six-channel digital
output.
The modules contain a single Light Emitting Diode (LED)
as its light source. The light is collimated into a parallel
beam by means of a single polycarbonate lens located di-
rectly over the LED. Opposite the emitter is the integrated
detector circuit. This IC consists of multiple sets of photo
detectors and the signal processing circuitry necessary to
produce the digital waveforms.
The codewheel rotates between the emitter and detector,
causing the light beam to be interrupted by the pattern of
spaces and bars on the codewheel.
The photodiodes that detect these interruptions are ar-
ranged in a pattern that corresponds to the radius and
design of the code-wheel. These detectors are also delib-
erately spaced such that a light period on one pair of de-
tectors corresponds to a dark period on the adjacent pair
of detectors.
The photodiode outputs are then fed through the signal
processing circuitry resulting in A, /A, B, /B, I, and /I. Com-
parators receive these signals and produce the final out-
puts for channels A and B. Due to this integrated phasing
technique, the digital output of channel A is in quadra-
ture with that of channel B (90 mechanical degrees out of
phase). The commutation feedback (U, V, W) signals are
generated based on the codewheel design.
2
Definition
Count (N):
(CPR). CPR refers to the raw signal from encoder that is the
cycles before 4x decode.
One Cycle:
One Shaft Rotation:
Cycle Error (ΔC):
ference between an observed shaft angle which gives rise
to one electrical cycle, and the nominal angular increment
of 1/N of a revolution.
Pulse Width (P):
output is high during 1 cycle. This value is nominally 180°e
or 1/2 cycle.
Pulse Width Error (ΔP):
of the pulse width from its ideal value of 180°e.
State Width (S):
transitions in the output of channel A and the neighbor-
ing transition in the output of channel B. There are 4 states
per cycle, each nominally 90°e.
State Width Error (ΔS):
of each state width from its ideal value of 90°e.
Commutation Accuracy (ΔI):
degrees, after shaft rotates passes the reference point (In-
dex channel) to the first U channel pulse. The measure-
ment from middle of channel I to channel U.
Phase (
center of the high state of channel A and the center of the
high state of channel B.
This value is nominally 90 °e for quadrature output.
Phase Error (Δ
value of 90°e.
Direction of Rotation:
clockwise direction viewing from top of the module, chan-
nel A will lead channel B. If the codewheel rotates in the
opposite direction, channel B will lead channel A.
Optical Radius (Rop):
center of rotation to the optical center (O.C) of the encod-
er module.
Index Pulse Width (Po):
that an index is high with reference to channel A or chan-
nel B during one full shaft rotation
f
):
360 electrical degrees (°e).
The number of electrical cycles per revolution
The numbers of electrical degrees between the
f
The numbers of electrical degrees between
):
An indication of cycle uniformity. The dif-
The number of electrical degrees that an
The deviation of the phase from its ideal
360 mechanical degrees.
The distance from the codewheel’s
When the codewheel rotates in the
The deviation, in electrical degrees,
The deviation, in electrical degrees,
The number of electrical degrees
The deviation, in mechanical