YYXX X00 HEDS-9200 Series Linear Optical Incremental Encoder Modules Data Sheet Note: Codestrip not included with HEDS-9200 Description Features The HEDS-9200 series is a high performance, low cost, High performance optical incremental encoder module. When operated in High resolution conjunction with a codestrip, this module detects linear Low cost position. The module consists of a lensedLED source and a detector IC enclosed in a small C-shaped plastic package . Easy to mount Due to a highly collimated light source and a unique pho- No signal adjustment required todetector array, the module is extremely tolerant to Insensitive to mechanical disturbances mounting misalignment. Small size The two channel digital outputs and the single 5 V supply -40 C to 100 C operating temperature input are accessed through four 0.025 inch square pins located on 0.1 inch centers. Two channel quadrature output Five standard resolutions between 4.72 counts per mm TTL compatible (120 counts per inch) and 7.87 counts per mm (200 counts Single 5 V supply per inch) are avail able. Consult local Avago sales repre- sentatives for other resolu tions ranging from 1.5 to7.87 counts per mm (40 to 200 counts per inch). Package Dimensions 26.67 (1.05) 8.6 (0.34) 15.2 (0.60) 0.63 (0.025) 2.54 (0.100) TYP. SQR. TYP. 1.8 1.52 (0.060) OPTION CODE 1.0 (0.04) (0.07) 5.1 (0.20) 2.9 DATE CODE 2.21 6.9 (0.27) (0.11) 11.9 (0.087) 2.54 3.73 0.05 (0.47) 20.8 (0.100) (0.147 0.002) (0.82) 1.02 0.10 11.7 (0.040 0.004) 8.81 (0.46) 4.75 0.10 5.8 (0.347) 45 (0.187 0.004) 2.67 (0.105) DIA. (0.23) OPTICAL ALIGNING RECESS MOUNTING THRU CENTER LINE 2.44/2.41 DIA. ALIGNING RECESS C HOLE 2 PLACES L 1.85 (0.073) 1.78 0.10* 5.46 0.10 ALIGNING RECESS (0.096/0.095) 2.44/2.41 X 2.79 (0.070 0.004) (0.215 0.004) 2.44/2.41 DIA. 2.16 (0.085) (0.096/0.095 X 0.110) 8.64 (0.340) 2.44/2.41 X 2.79 (0.096/0.095) DEEP 2.16 (0.085) DEEP REF. 2.92 0.10** 17.27 (0.096/0.095 X 0.110) 2.16 (0.085) DEEP (0.115 0.004) (0.680) 2.16 (0.085) DEEP OPTICAL 4.11 (0.162) 10.2 20.96 OPTICAL CENTER CENTER (0.400) (0.825) 6.35 (0.250) REF. TYPICAL DIMENSIONS IN SIDE A SIDE B MILLIMETERS AND (INCHES) * GAP MEASUREMENT TO THE SURFACE WINDOW = 1.68 0.10 (0.066 0.004) ** HEIGHT TO THE WINDOW = 3.02 0.10 (0.119 0.004) ESD WARNING: Normal handling precautions should be taken to avoid static discharge. V CC 5 CH. B 4 V CC 3 CH. A 2 N.C. 1 GND GND HEDS-9200Block Diagram Output Waveforms RESISTOR V C CC P 3 LENS CHANNEL A PHOTO- DIODES COMPARATORS A CHANNEL A + LED A - 2 S2 S1 S3 S4 B CHANNEL B CHANNEL B + B - 4 SIGNAL ROTATION PROCESSING CIRCUITRY GND 1 EMITTER SECTION CODE DETECTOR SECTION WHEEL Applications Definitions The HEDS-9200 provides sophisti cated motion detection Count density (D): The number of bar and window pairs per at a low cost, making it ideal for high volume applications. unit length of the codestrip. Typical applications include printers, plotters, tape drives, Pitch: 1/D, The unit length per count. and factory automation equipment. Electrical degree (e): Pitch/360, The dimension of one bar Note: Avago Technologies encoders are not recommend- and window pair divided by 360. ed for use in safety critical applica tions. Eg. ABS braking systems, power steering, life support systems and critical 1 cycle (C): 360 electrical degrees, 1 bar and window pair. care medical equipment. Please contact sales representa- Pulse Width (P): The number of electrical degrees that an tive if more clarification is needed. output is high during 1 cycle. This value is nominally 180e Theory of Operation or cycle. The HEDS-9200 is a C-shaped emitter/detector module. Pulse Width Error ( P): The deviation, in electrical degrees, Coupled with a codestrip it translates linear motion into a of the pulse width from its ideal value of 180e. two-channel digital output. State Width (S): The number of electrical degrees between As seen in the block diagram, the module contains a single a transition in the output of channel A and the neighbor- Light Emitting Diode (LED) as its light source. The light is ing transition in the output of channel B. There are 4 states collimated into a parallel beam by means of a single poly- per cycle, each nominally 90e. carbonate lens located directly over the LED. Opposite the State Width Error (S): The deviation, in electrical degrees, emitter is the integrated detector circuit. This IC consists of each state width from its ideal value of 90e. of multiple sets of photodetectors and the signal process- ing circuitry necessary to produce the digital waveforms. Phase ( ): The number of electrical degrees between the center of the high state of channel A and the center of the The codestrip moves between the emitter and detector, high state of channel B. This value is nominally 90e for causing the light beam to be interrupted by the pattern of quadrature output. spaces and bars on the codestrip. The photodiodes which detect these interruptions are arranged in a pattern that Phase Error ( ): The deviation of the phase from its ideal corresponds to the count density of the codestrip. These value of 90e. detectors are also spaced such that a light period on one pair of detectors corresponds to a dark period on the Direction of Movement: When the codestrip moves, relative adjacent pair of detectors. The photodiode outputs are to the module, in the direction of the arrow on top of the then fed through the signal processing circuitry resulting module, channel A will lead channel B. If the codestrip in A, A, B and B. Two comparators receive these signals moves in the opposite direction, channel B will lead and produce the final out puts for channels A and B. Due channel A. to this integrated phasing tech nique, the digital output of channel A is in quadrature with that of channel B (90 degrees out of phase). 2 AMPLITUDE