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Agilent AEAS-84AD 14/12 Bit Multi-turn Encoder Module
Data Sheet
Features General Description The AEAS-84AD provides all functions as an optoelectronicmechanical unit in order to implement with AEAS-7000 an absolute multi-turn encoder with a combine capacity of up to 30 bits. The unit consists of an IR-LED circuit board, a phototransistor (PT) circuit board, and 6 or 7 code wheels arranged in between the PCBs. Specifications The multi-turn unit is available in the following versions: * 12-bit solid shaft * 14-bit solid shaft * 16384 (14bits) and 4096 (12bits) revolution count versions * Optical, absolute multi-turn assembly with max. O55 mm and typical height 11.9 mm. * Operating temperatures of -40C to +85C * Mechanical coupling by means of gearwheels with module of 0.3 * Operating speeds up to 12,000 rpm * A 2x4-pole pin strip for power supply and signals * 5V +/-10% power supply with low power consumption * Code wheel-like multiplexing of the digital position data Benefits * No battery or capacitor required for number of revolution counting during power failure * Immediate position detection on power up
Applications * Major component of Multi-turn housed encoder * Cost effective solution for direct integration into OEM systems * Linear positioning system
Pinning
SEE Detail1 Detail1 5 7 8 6 4 2 3 1
Pins allocation: 1. GND 2. MTDAT2 3. MTDAT1 4. MTDAT0 5. MTMUX2 6. MTMUX1 7. MTMUX0 8. VCC
8.2 Side View Bottom View
Note: 3rd angle viewing Example of matching connector: MPE GARRY 521 Series, No. BL21-43GGG-008
Figure 1. Pin Configuration
Block Diagram and Detailed Description In the following descriptions, the I/O pins are enclosed by a box, e.g., MTMUX[2:0] .
VCC (+5V)
7x 3 PT's
7x 3 IR's
1 of 8-Decoder
3 3 x 100K
MTMUX[2:0]
3 x 4K7 3 Comparator 3 x 4K7
3 3 MTDAT[2:0]
GND
Figure 2. Block Diagram
2
Multiplexing and Position Data Each of the 1:4 reduced 7 code wheels generates a 3-bit code, from which the 14-bit Gray code can be generated as position data through V-bit processing. The 3-bit code is identical electrically for all code wheels, only the projection on the mechanical angle (the revolutions) is different according to the 1:4 divisions. The code and the data bits and V-bits to be generated are shown in the following diagram for the code wheel 1:
Shaft Turns
0
1
2
3
4
MSB Singleturn 1. Wheel Turns 1. MTDAT[0] 1. MTDAT[1] 1. MTDAT[2] Gray Code (generated) Data-Bit1 Data-Bit2 V-Bit2 0 1
Figure 3. Multiplexing Diagram for gear wheel 1
The 3-bit codes of the code wheels 1 to 7 are output on MTDAT[2:0] de-multiplexed with MTMUX[2:0]. Here, the binary value on MTMUX[2:0] corresponds to the code-wheel number (1 = code wheel 1, 2 = code wheel 2, etc.). The configuration is displayed with the value "0."
The following table shows the assignments: Table 1. Demultiplexing Diagram for all gear wheels
Bin/Dec MTMUX[2:0] 001 / 1 010 / 2 to 111 / 7 000 / 0 MTDAT[2] 3-bit code wheel 1 3-bit code wheel 2 to 3-bit code wheel 7 always 1 MTDAT[1] MTDAT[0]
0 = 12 bit 1 = 14 bit
1 = MU1xSS
3
Gray code-generation For the readout schematic of the multi-turn code gears, i.e. with the user's microcontroller, there must be a logical replication of the V-bit multiplexers. This can be done by a bit manipulation or by look up tables. Care needs to be taken with the real time readout conditions. The procedure is as follows : 1. The 3 bits (MTDAT[2:0] of each gear (C1[2:0] bits C7[2:0]) are continuously de-multiplexed. Thus there are maximal 3bits x 7gears = 21Bit AEAS-84AD-Data in parallel. 2. Synchronous to the readout of the AEAS-7000 sensor, those AEAS-84AD bits (depending on the MSB bit (1.SEL-bit) of the AEAS7000) needs to be complemented to the complete Gray code word (cascading). 3. The bit change of the complete Gray code will be synchronized by the AEAS7000 and thus electronically eliminating gear play. The logic diagram for ONE gear is shown in the following diagram (V-bit-Multiplexer), Figure 4.
Logic Diagram
From MTDAT-Demux (Code-Wheel x) Cx[2] 0 Y Cx[1] 1S V2 (V-Bit2) 4x MUX2
0 Y 1S D2 (Data-Bit2)
XOR 0 Y Cx[0] 1S
0 Y 1S SEL D1 (Data-Bit1)
Truth Table
SEL 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 Cx[0] Cx[1] Cx[2] 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 D1 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 D2 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 V2 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
Figure 4. Logic Diagram and Truth Table for one of the gear
4
The following diagram shows the cascading of the V-bitMultiplexer of all gears. The outputs are the 14bits Gray code in parallel. The MSB of the complete code is dependant on the total resolution of the system. It can be used in steps of 2 bits (14Bit,12Bit,...etc). Unused higher bits should be masked to logical zero. With the data-multiplexer IC version of the multi-turn encoder module, the data multiplexer IC will perform the complete driving and data processing of the encoder units while maintaining all time constraints. There is an IC available to combine both the AEAx-7x00 13/16-bit single turn component and the AEAx84AD 12/14bit multiturn module into one-single powerful multi-turn absolute encoder. This one-stop solution enables the design of a highend absolute encoder with minimum component count at integration level. Figure 6 shows an application example of integration of single-turn absolute encoder and multiturn module using MUIC.
Note: To simplify the synchronization with singleturn absolute encoder(e.g. AEAS-7000), the total solution has been embedded into a single chip MUIC. Please refer to the Ordering Information for this device.
V-Bit-Multiplexer-Cascade
C7[2] Demuxed Code-Wheel 7 C7[1] C7[0] Cx[2] Cx[1] Cx[0] SEL V2 D2 D1 Gray-Bit14 Gray-Bit13 (MSB for 14Bit) Gray-Bit12
C6[2] Demuxed Code-Wheel 6 C6[1] C6[0]
Cx[2] Cx[1] Cx[0] SEL
V2 D2 D1
Gray-Bit12 Gray-Bit11 (MSB for 12Bit) Gray-Bit10
C5[2] Demuxed Code-Wheel 5 C5[1] C5[0]
Cx[2] Cx[1] Cx[0] SEL
V2 D2 D1 Gray-Bit9 Gray-Bit8
C2[2] Demuxed Code-Wheel 2 C2[1] C2[0]
Cx[2] Cx[1] Cx[0] SEL
V2 D2 D1 Gray-Bit3 Gray-Bit2
C1[2] Demuxed Code-Wheel 1 C1[1] C1[0]
Cx[2] Cx[1] Cx[0] SEL
V2 D2 D1 Gray-Bit1 Gray-Bit0
Sample AEAS-7000 MSB
Figure 5. The cascading of V-bit-Multiplexer of all gear wheels
5
Application Example of Multiturn Absolute Encoder
VCC +5 V BIT SETTINGS ARE APPLICATION SPECIFIC MT-CONFIG. 14/16 +2FF CODE MT-ST CR LM317L 100 n 100 n AEAx-84AD VCC CFG MTMUX MTDAT GND OPTOCOUPLER AEAx-7x00 DOUT SCL NSL DIN MSBINV N2DOUT N2SCL N2NSL N2DIN N2MSBINV DCLK CLKQ HCLK MHz 16..32 CLOCK OSCILLATOR EXAMPLES LTC1799-SOT23-5 SINGLEGATE RESONATOR HCLK/ H/1/8/64 1..16 1 2 3 VDD OUT GND RSET DIV 4 5 1/6 HC14 BIT SETTINGS ARE APPLICATION SPECIFIC /2..63 10 K MHz ..16 PRESC (3:0) MFFREQ MFTIME (1:0) (5:0) MCLR RESET CIRCUIT EXAMPLE 4 2 6 1/6 HC14 RESET TIME SHOULD BE RELATED TO OSCILLATOR STARTUP TIME SERIAL INTERFACE MSBINV 2x 1/8 HC14 OUT IN CR CR-INPUT 2x 1/8 HC14 SRCLK OUT IN+ INCLK+ CLK3 3 3x 100 K 3x 1 K MTMUX(2:0) MTDAT(2:0) FFOUT STROBE N2L16 SRADD2 GRAY MTDIR 3 1 1 1 1 +2.5 V VOUT VIN VREG 100 n 470R DRIVER IN OUT+ OUTDE DATA+ DATA5 V REGULATOR +5 V GND VB+ VBVB+ VB-
VDDI GND VDDa 100 n 470R
MU-IC1
10 K (10 MHz)
Figure 6. Application example of integration of single-turn absolute encoder module and multiturn module using MUIC.
6
Electrical Specifications Absolute Maximum Ratings
Symbol VCC Vi Vo %RH Tstg Parameter DC Supply Voltage Input Voltage Output Voltage Moisture Level (Non-Condensing) Storage Temperature Limits -0.3 to +6.0 -0.5 to +5.5 -0.5 to +VCC +0.5 85 -40 to +100 Units V V V % C
Note : This device meets the ESD ratings of the IEC61000-4-2 HBM Level 4 (8KV)
Recommended Operating Conditions Symbol Parameter VCC DC Supply Voltage Tamb Ambient Temperature Delay Multiplex Read tDMUXRD Encoder Shaft r.p.m SRPM DC Characteristics VCC = 4.5 to 5.5 V / Tamb = -40 to +85C
Values +4.5 / +5.0 / +5.5 -40 to +85 64 max 12,000
Units V C s 1/min
Symbol VOH VOL VIH VIL IIL / IIH ICC
Parameter MTDAT[2:0] IOH = -50A Output High Voltage (10K Pull-up) MTDAT[2:0] IOL = 50A Output Low Voltage (4K7 Series-R) Input High Voltage VCC=4.5V VCC=5.5V Input Low Voltage MTMUX[2:0] 100K Input Current., VIN=VCC or 0V Pull-down VCC Supply Current
Min 4.0
Values Typ.
Max
Units V V V
0.4 3.2 3.9 -10 10 0.8 100 20
V A mA
Timing Characteristics VCC= 4.5 to 5.5V / Tamb = -40 to +85C
Symbol tR / tF tDMUXRD SRPM
Parameter Input Transition Rise-/Fall-Time Delay Multiplex Read Encoder Shaft r.p.m
Min 0.8V / 3.0V
Values Typ
Max 500 57 12K
Units ns s 1/min
MTMUX[2:0]
old value
new value
t DMUXRD
MTDAT[2:0]
old value
new value
7
Application Note The encoder is mechanically fixed by means of holes in adapters, which accommodate M3 threads. The encoder has 2 adapters for attaching in a 3 x 120 and 4 x 90 arrangement (for details see the mechanical drawings in the following page). The mechanical coupling of the encoder shaft is realised by means of gearwheels with a module of 0.3, 14 teeth. The zero positions of the coupling wheels are locked with a plastic plug for alignment to the AEAS-7000, with the coupling wheel being able to compensate for an angle error of about +/-7. The electrical connection is realized by means of a 2x4 pin strip (1.27mm pitch), which is plugged into a corresponding female connector. The encoder is attached with a plastic plug that locks the absolute zero position. During the mating of the gearwheel and the encoder coupling wheel it may be necessary to align the teeth of the gears for proper matching. The plastic plug can be removed upon integration with the gearwheel.
Plastic plug is removed upon integration with gearwheel
Zero position of coupling wheel Plastic plug Gearwheel on the motor shaft, module 0.3, 14 teeth
Figure 7. Mechanical coupling with Multiturn Encoder Module
Mechanical Drawing
3.8
4.3
35.4.1
55.0
24.1.1 6 - 3.5
11.9.3
22.5
24.5
6.5.1 49.3 24.1.1
35.4.1
6.5.1 53.5 8.2
(Dimensions are in millimeters)
Figure 8. Package dimensions
Ordering Information AEAS-84AD-LBSC0 AEAS-84AD-LBSF0 multi-turn, solid shaft, serial, 12 bit multi-turn, solid shaft, serial, 14 bit
Ordering information for MUIC: MUIC1-V0 MUIC1-V0-X79 Note: leaded, industrial temperature range +85C lead-free, industrial temperature range +85C
The manufacturer contact for the above MUIC part numbers is as follows: OPTOLAB Microsystems AG Konrad-Zuse-Str.14 DE-99099 Erfurt / Germany Phone: +49-361-55144-0 Fax: +49-361-55144-50 Email: agilent@optolab.com
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) 6756 2394 India, Australia, New Zealand: (+65) 6755 1939 Japan: (+81 3) 3335-8152(Domestic/International), or 0120-61-1280(Domestic Only) Korea: (+65) 6755 1989 Singapore, Malaysia, Vietnam, Thailand, Philippines, Indonesia: (+65) 6755 2044 Taiwan: (+65) 6755 1843 Data subject to change. Copyright (c) 2005 Agilent Technologies, Inc. February 25, 2005 5989-1203EN

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