AEDS-962 HP | Alldatasheet
Document overview
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Technical content
Features
- Very small
- Low package height
- Built-in codewheel and codestrip guide bumps
- Wide resolution range
- For linear and rotary applications
- No signal adjustment required
- Insensitive to radial and axial play
- 0˚C to +70˚C operating temperature
- Two-channel quadrature output
- TTL 3.3 V CMOS compatible
- Wave solderable
Description
This is a very small, low package height and high performance incremental encoder module. When operated in conjunction with either a codewheel or codestrip, this module detects rotary or linear position. The encoder consists of a lensed LED source and a detector IC enclosed in a small C-shaped plastic package. Due to a highly collimated light source and a unique photodetector array, the module is extremely tolerant to mounting misalignment. The two-channel digital outputs and
3.3 V supply input are accessed
through four solder plated leads located on 2.00 mm (0.1 inch) centers. The supply input of the LED, rated at 16 mA, is accessed through two leads located at 2.54 mm. It is designed for use with an 23.36 mm optical radius codewheel or linear codestrip. Other options are available. Please contact the factory for more information.
Applications
sophisticated motion detection, making closed-loop control very cost effective. Typical applications include printers, plotters, copiers, and office automation equipment. Note: Agilent Technologies’ encoders are not recommended for use in safety critical applications, eg., ABS braking systems and critical-care medical equipment. Please contact a sales representative if more clarification is needed. Theory of Operation The AEDS-962x is a C-shaped emitter/detector module. Coupled with a codewheel, it translates rotary motion into a two-channel digital output. Coupled with a codestrip, it translates linear motion into digital outputs. As seen in Figure 1, the module contains a single Light Emitting Diode (LED) as its light source. The light is collimated into a parallel beam by means of a single lens located directly over the LED. Opposite the emitter is the integrated detector circuit. This IC consists of multiple sets of photodetectors and the signal processing circuitry necessary to produce the digital waveforms. The codewheel/codestrip moves between the emitter and detector, causing the light beam to be interrupted by the pattern of spaces and bars on the codewheel/codestrip. The photodiodes which detect these interruptions are arranged in a pattern that corresponds to the radius and count density of the codewheel/codestrip. These detectors are also spaced such that a light period on one pair of ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.
Parameter Symbol Min. Max. Units Notes Storage Temperature T S –40 85 ˚C Operating Temperature T A 07 0 ˚ C Supply Voltage (Detector) V CC –0.5 7 V Output Voltage V O –0.5 V CC V Output Current per Channel I O –1.5 10 mA Soldering Temperature 260 ˚C t ≤ 5 sec. DC Forward Current (LED) I LED 50 mA V F < 1.8 V Reverse Voltage V R 5V I R = 100 µA detectors corresponds to a dark period on the adjacent pair of detectors. The photodiode outputs are fed through the signal processing circuitry. Two comparators receive these signals and produce the final outputs for channels A and B. Due to this integrated phasing technique, the output of channel A is in quadrature with channel B (90 degrees out of phase). Definitions Note: Refer to Figure 2. Count (N) = The number of bar and window pairs or counts per revolution (CPR) of the codewheel. One Cycle (C) = 360 electrical degrees (˚e) = 1 bar and window pair One Shaft Rotation = 360 mechanical degrees = N cycles each state width from its ideal value of 90°e. Pulse Width (P): The number of electrical degrees that an output is high during one cycle. This value is nominally 180˚e or 1/2 cycle. Pulse Width Error ( Δ P): The deviation, in electrical degrees, of the pulse width from its ideal value of 180˚e. State Width (S): The number of electrical degrees between a transition in the output of channel A and the neighboring transition in the output of channel B. There are 4 states per cycle, each nominally 90˚e. State Width Error (Δ S): The deviation, in electrical degrees, of each state width from its ideal value of 90°e. Phase (φ): The number of electrical degrees between the center of the high state of channel A and the center of the high state of channel B. Phase Error ( Δφ): The deviation of the phase from its ideal value of 90˚e. Direction of Rotation: When the codewheel rotates in the counterclockwise direction (as viewed from the encoder end of the motor), channel A will lead channel B. If the codewheel rotates in the clockwise direction, channel B will lead channel A. Optical Radius (R OP): The distance from the codewheel’s center of rotation to the optical center (O.C.) of the encoder module. Angular Misalignment Error A): Angular misalignment of the sensor in relation to the tangential direction. This applies for both rotary and linear motion. Mounting Position (R M): The distance from motor shaft center of rotation to center of alignment tab receiving hole.
Recommended Operating Conditions Parameter Symbol Min. Typ. Max. Units Notes Temperature T A 02 5 7 0 ˚ C Supply Voltage (Detector) V CC 2.8 3.3 5.2 V Ripple < 100 mV p-p Load Capacitance C L none 100 pF Pullup Resistor R PULL none k Ω Recommend no pullup. Device has integrated 2.2 KΩ on outputs. Count Frequency f 40 kHz Velocity (rpm) x N/60 Angular Misalignment Error E A –3.0 0.0 +3.0 deg. Mounting Considerations Mounting Position R M ROP – 2.4 mm *Refer to Mounting Considerations (ROP – 0.095") (inch) DC Forward Current (LED) I LED 10 16 20 Recommended 110 Ω (±10%) @ VCC = 3.3 V series resistor between 3.3 V supply and VLED.
Electrical Characteristics
Electrical Characteristics over Recommended Operating Range, Typical at 25˚C. Parameter Symbol Min. Typ. @ 3.3 V Max. Units Notes Supply Current I CC 23 5 m A (Detector) High Level Output V OH 2.4 3 3.6 V When V OH = 2.4 (min.) Voltage Typical IOH = –0.4 mA @ 3.3 V Low Level Output V OL 0.4 V When V OL = 0.4 (min.) Voltage Typical IOH = 13 mA @ 3.3 V Rise Time t r 200 ns C L = 25 pF, RL = 11 kΩ Fall Time t f 50 ns LED Forward Voltage V F 1.52 1.54 V Note: Refer to Figure 2 for output waveform on t r and tf. Encoding Characteristics Encoding Characteristics Over the Recommended Operating Conditions and Mounting Conditions. These characteristics do not include codewheel/codestrip contribution. The typical values are averages over the full rotation of the codewheel. Parameter Symbol Typical Maximum Units Pulse Width Error Δ P 4 40 ˚e Logic State Width Error Δ S 5 40 ˚e Phase Error Δφ 41 5 ˚ e Note: Recommended no pullup. Device has integrated 2.2 k Ω pullup resistor on Channel A & Channel B outputs.
Figure 1. Figure 2. C P S1 S2 S3 S4 2.4V 0.4V CHANNEL B CHANNEL A tr tf ROTATION AMPLITUDE OI A A CHANNEL A1 B B CHANNEL B3 VCC GND4 SIGNAL PROCESSING CIRCUITRY VLED GND LED LENS PHOTO- DIODES PULLUP RESISTOR
2.5 K x 2
AEDS-962x SERIES BLOCK DIAGRAM
I. Nominal values are evaluated profiles for optimum performance.
- Min./Max. are critical limits to ensure encoders in good condition.
Figure 3. Recommended wave solder profile.
Figure 4. Mounting consideration. in order to keep enough margin for encoder operation. THESE DIMENSIONS INCLUDE SHAFT END PLAY AND CODEWHEEL WARP. SHOULD BE MEASURED WITH RESPECT TO THE TWO MOUNTING POSTS SHOWN ABOVE.
13.7 6.9 3.5 3.5 C – COUNTRY OF ORIGIN MARKING (REFER -05 FOR DETAILS) PART # (REFER -05) RESOLUTION IDENTIFICATION DATE CODE OPTICAL CENTER MARK XXXXX CX Agilent 0.5 R 1.1 1.4 5.6 11.0 4.1 0.5 2.00.5 0.254 (LEADFRAME THICKNESS) 1.8 7.6 2.6 MAX. EXTERNAL RADIUS R 0.5 4.40 ∅ 2.00 (2 PLACES) 7.0 0.8 1.0 YYWW CHAMFERED LEAD-IN (BOTH SIDES) (OPTICAL CENTER) (EMITTER) (DETECTOR) 1.10 2 – ∅ 2.10 ± 0.05 4.40 11.0 ± 0.2 13.1± 0.2 1.27 2.54 TYP. 2.00 TYP. 1.00 6 – ∅ 1.00 MOUNTING FOOTPRINT CH A CH B VCCGND VCC GND XXXXX Agilent10 YYWW
13.7 6.9 3.5 3.5 C – COUNTRY OF ORIGIN MARKING (REFER -05 FOR DETAILS) PART # (REFER -05) RESOLUTION IDENTIFICATION DATE CODE OPTICAL CENTER MARK XXXXX CX Agilent 0.5 R 1.1 1.4 5.6 11.0 4.1 0.5 2.00.5 0.254 (LEADFRAME THICKNESS) 1.8 7.6 2.6 MAX. EXTERNAL RADIUS R 0.5 4.40 ∅ 2.00 (2 PLACES) 7.0 0.8 1.0 YYWW CHAMFERED LEAD-IN (BOTH SIDES) (OPTICAL CENTER) (EMITTER) (DETECTOR) 1.10 1.27 2.54 TYP. 2.00 TYP. 1.00 6 – ∅ 1.00 MOUNTING FOOTPRINT CH A CH BVCC GND VCC GND XXXXX Agilent10 YYWW LEAD PITCH 2.56 LEAD PITCH 2.00
Ordering Information
Lead Configuration Resolution Options 2 – Linear 0 – Straight Leads 2 – 300 LPI, Linear 1 – Bent Leads AEDS-96 Option
www.agilent.com/semiconductors For product information and a complete list of distributors, please go to our web site. For technical assistance call: Americas/Canada: +1 (800) 235-0312 or (408) 654-8675 Europe: +49 (0) 6441 92460 China: 10800 650 0017 Hong Kong: (+65) 6271 2451 India, Australia, New Zealand: (+65) 6271 2394 Japan: (+81 3) 3335-8152(Domestic/Interna- tional), or 0120-61-1280(Domestic Only) Korea: (+65) 6271 2194 Malaysia, Singapore: (+65) 6271 2054 Taiwan: (+65) 6271 2654 Data subject to change. Copyright © 2002 Agilent Technologies, Inc. November 26, 2002 5988-8275EN