AEDR-8502-102

AEDR-850x 3 Channel Reflective Incremental Encoders Data Sheet Description Features The AEDR-850X encoder is the smallest 3 channels optical encoder with digital outputs in the market employing reflective technology for motion control purposes. The encoder is designed to operate over –20°C to 85°C temperature range and hence suitable for both commercial and even industrial end applications.  World smallest 3 channels reflective technology encoder. The encoder houses an LED light source and a photodetecting circuitry in a single package. The small size of 3.95 mm (L) × 3.4 mm (W) × 0.9562 mm (H), allows it to be even used in a wide range of miniature commercial application where size and space is a primary concern. The AEDR-850X encoder offers two-channel quadrature digital outputs and a third channel, index digital outputs. Being TTL compatible, the outputs of the AEDR-850X encoder can be interfaced directly with most of the signal processing circuitries. Hence the encoder provides great design in flexibility and easy integration into existing systems. R  Surface mount leadless package 3.95 mm (L) × 3.4 mm (W) × 0.9562 mm (H)  3 channels; two channel quadrature digital outputs for direction sensing and a third channel, Index digital output.  Build in interpolator, factor of 1×, 2×, and 4× selectable via external pinouts  TTL compatible  Single 5 V supply  –20°C to 85°C absolute operating temperature  Encoding resolution: 294 to 304 (lines/inch) Applications Ideal for high volume applications:  Close loop stepper motors  Miniature motors VCC  Printers  Copiers VCC Ch A Ch B Ch I Signal Processing Circuitry SEL 4X SEL 2X Gnd  Card readers Reflective Encoder Gnd  Scanners  Projectors  Consumer and industrial product applications Codewheel Note: Drawing not to scale. Note: Avago Technologies encoders are not recommended for use in safety critical applications, e.g., ABS braking systems, power steering, life support systems and critical care medical equipment. Avago’s products and software are not specifically designed, manufactured or authorized for sale as parts, components or assemblies for the planning, construction, maintenance or direct operation of a nuclear facility or for use in medical devices or applications. Customers are solely responsible, and waive all rights to make claims against Avago or its suppliers, for all losses, damage, expense or liability in connection with such use. Please contact your local sales representative if more clarification is needed. Output waveform Top View P C 360 e Deg A Amplitude φ S1 B S2 S3 S4 Anti-clockwise Po Index of 90 e Deg option I Encoder Ch. A leads Ch. B Po Index of 180 e Deg option I Po Codewheel Index of 360 e Deg option I Note: Drawing not to scale. Codewheel rotation movement (Anti-clockwise) QUADRATURE SIGNALS A, B and I Absolute Maximum Ratings Storage Temperature, TS –40° C to 85° C Operating Temperature, TA –20° C to 85° C Supply Voltage, VCC 7V Output Voltage, VO VCC Notes: 1. Exposure to extreme light intensity (such as from flashbulbs or spotlights) may cause permanent damage to the device. 2. CAUTION: It is advised that normal static precautions should be taken when handling the encoder in order to avoid damage and/or degradation induced by ESD. 3. Proper operation of the encoder cannot be guaranteed if the maximum ratings are exceeded. Recommended Operating Conditions ( based on limited prototype samples testing @ 11.38 Rop codewheel) Parameter Sym. Min. Typ. Max. Units Temperature TA -20 25 85 °C Supply Voltage VCC 4.5 5 5.5 V Ripple < 100mVp-p LED Current ILED 15mA mA See note 1 Count Frequency2 F 55 kHz 1 x Interpolation Factor Radial Misalignment ER ±0.2 mm Tangential Misalignment ET ±0.2 mm Codewheel Gap G 1.25 mm 0.5 1.0 Notes: 1. LED Current Limiting Resistor: Recommended series resistor = 180  (±1%) 2. Count frequency = velocity (rpm) x CPR / 60. 3. Avago recommends 1.0mm gap as nominal. 2 Notes See note 3 Encoder Pin-Out Pin 8 Gnd Pin 1 VLED Emitter Pin 7 SEL 4X Pin 2 SEL 2X Detector Pin 6 VCC Pin 5 A Pin 3 CHI Pin 4 B Pin configuration (Top view) Encoder’s Built-in Interpolation Pin (Interpolation) SEL 4X SEL 2X Interpolation Factor CPR @ ( ROP = 11.38 mm ) Count Frequency L L 1X 828 55 KHz L H 2X 1656 110 KHz H L 4X 3312 220 KHz H H Factory use H = HIGH Logic Level L = LOW Logic Level The interpolation factor above may be used in conjunction with the below formulae to cater the needs for various rotation speed (RPM) and count. RPM = (Count Frequency x 60 ) / CPR The CPR (@ 1X interpolation) is based on the following formulae which is directly dependent on ROP CPR = LPI x 2 x ROP (inch) or CPR = LPmm x 2 x ROP (mm) 3 Encoding Characteristics (Codewheel of Rop @11.38 mm) Encoding characteristics over the recommended operating condition and mounting conditions. Parameter Symbol Typical Interpolation factor Unit 1X 2X 4X Cycle Error C 18 22 36 °e Pulse Width Error P 15 20 30 °e Phase Error  9 15 18 °e State Error S 10 15 25 °e Index Pulse Width (Gated 90°) PO 90 90 90 °e Index Pulse Width (Gated 180°) PO 180 180 180 °e Index Pulse Width (Gated 360°) PO Not Available 360 360 °e Notes: 1. Typical values represent the encoder performance at typical mounting alignment, whereas the maximum values represent the encoder performance across the range of recommended mounting tolerance. 2. For optimal performance, please refer to alignment method as described in Application Note 5500 (document AV02-2789EN) Electrical Characteristics Characteristics over recommended operating conditions at 25° C. Parameter Symbol Min. High Level Output Voltage VOH 2.4 Low Level Output Voltage VOL Output current per channel, Iout IO Rise Time tr