HEDT-9141#I00 Avago Technologies US Inc., HEDT-9141#I00 Datasheet - Page 10

• Manufacturer Part Number: HEDT-9141#I00
• Description: Encoders 3 Channel 512CPR
• Manufacturer: Avago Technologies US Inc.
• Type: Optical Encoderr

Specifications of HEDT-9141#I00

• Pulses Per Revolution: 2048
• Detents: No
• Motion: Rotary
• Number Of Channels: 3
• Mounting Style: Through Hole
• Index Output: Indexed
• Encoder Signal: Digital
• Built In Switch: No
• Operating Supply Voltage (typ): 5VDC
• Operating Temperature Min Deg. C: -40C
• Terminal Type: PC Pins
• Termination Style: Solder Pin
• Supply Voltage: 5 V
• Product: Optical
• Technology: Rotary
• Lead Free Status / RoHS Status: Compliant

Using Multiple Index Pulses
The third channel index (Channel I) is not limited to
occurring just once per revolution. Index pulses may be
placed arbitrarily over a full codewheel rotation. This is
done by altering only the pattern of the codewheel with
no modifi cations necessary to the HEDT-9X40 module.
The only restriction is that, depending on the CPR of the
codewheel, consecutive index pulses may have to be
separated by at least 10 full cycles.
Multiple index pulses can provide more precise absolute
position information. By strategically placing the index
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Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies in the United States and other countries.
Data subject to change. Copyright © 2005-2010 Avago Technologies. All rights reserved.
AV02-1932EN - January 5, 2010
www.avagotech.com
pulses, a unique index series can be created for a par-
ticular angular position. This leads to the idea of the
“quasiabsolute” encoder in which only a partial turning
of the codewheel is required to determine the absolute
position.
A special codewheel is required to accomplish a multiple
index pattern. The standard HEDS-5140, 5145, and 6145
codewheels have one index pulse per full revolution.
Please consult a local Avago sales representative for
further information.