Additional Resources: Product Page date 09/10/2021 page 1 of 10 SERIES: AMT20 DESCRIPTION: MODULAR ABSOLUTE ENCODER FEATURES patented capacitive ASIC technology low power consumption settings configurable with AMT Viewpoint GUI digitally set zero position alignment 12-bit absolute position via SPI (4096 positions) incremental resolutions up to 1024 PPR index pulse compact modular package with locking hub for ease of installation 7 different mounting hole options -40~125C operating temperature ELECTRICAL parameter conditions/description min typ max units power supply VDD 4.5 5 5.5 V 1 start-up time 200 ms current consumption with unloaded output 8 10 mA VDD-0.8 V output high level output low level 0.4 V output current CMOS sink/source per channel 2 mA rise/fall time 30 ns Note: 1. Encoder must be stationary during start-up. INCREMENTAL CHARACTERISTICS parameter conditions/description min typ max units channels quadrature A, B, and Z index waveform CMOS voltage square wave phase difference A leads B for CCW rotation (viewed from front) 90 degrees 96, 192, 200, 250, 384, 400, 500, 512, 768, 800, 2 quadrature resolutions PPR 1000, 1024 index one pulse per 360 degree rotation accuracy 0.2 degrees quadrature duty cycle 50 % Notes: 2. Resolution selected via AMT Viewpoint PC Software. Default resolution set to 1024 PPR. All resolutions are listed as pre-quadrature, meaning the final number of counts is PPR x 4. ABSOLUTE POSITION CHARACTERISTICS parameter conditions/description min typ max units resolution 12 bits encoder can be zero-set via SPI or AMT Viewpoint PC positions Software accuracy 0.2 degrees cuidevices.comAdditional Resources: Product Page CUI Devices SERIES: AMT20 DESCRIPTION: MODULAR ABSOLUTE ENCODER date 09/10/2021 page 2 of 10 MECHANICAL parameter conditions/description min typ max units motor shaft length 9 mm motor shaft tolerance NOM +0/-0.015 mm weight 15.7 g axial play 0.3 mm rotational speed 8000 RPM ENVIRONMENTAL parameter conditions/description min typ max units operating temperature -40 125 C humidity non-condensing 85 % vibration 10~500 Hz, 5 minute sweep, 2 hours on each XYZ 5 G shock 3 pulses, 6 ms, 3 on each XYZ 200 G RoHS yes SERIAL INTERFACE parameter conditions/description min typ max units protocol Serial Peripheral Interface (SPI) 1 controller SPI driven by onboard Microchip PIC16F690 3 data rate 1 MHz Note: 3. See Microchip documentation for additional details. WAVEFORMS Figure 1 Quadrature signals with index showing counter-clockwise rotation I X A T S S S S P B The following parameters are defined by the resolution selected for each encoder. The encoders resolution is listed as Pulses Per Revolution (PPR), which is the number of periods (or high pulses) over the encoders revolution. Parameter Description Expression Units Notes This is the user selected value and the PPR resolution Pulses Per Revolution format all resolutions are listed in This is the number of quadrature counts CPR counts PPR x 4 Counts Per Revolution the encoder has T period 360/R mechanical degrees P pulse width T/2 mechanical degrees S A/B state width T/4 mechanical degrees This is the width of a quadrature state The width of a once per turn index is the I index width T/4 mechanical degrees state width for A & B lines Note: For more information regarding PPR, CPR, or LPR (Lines Per Revolution) view