Additional Resources: Product Page date 09/10/2021 page 1 of 8 SERIES: AMT23 DESCRIPTION: MODULAR ABSOLUTE ENCODER FEATURES patented capacitive ASIC technology low power consumption 12 or 14-bit absolute positon single ended 3-wire Synchronous Serial Interface checksum bits for error detection configuration and firmware updates via AMT Viewpoint software digitally settable zero position compact modular package with locking hub for ease of installation radial and axial cable connections -40 ~ 105C operating temperature ELECTRICAL parameter conditions/description min typ max units power supply VDD 3.8 5 5.5 V 1 start-up time 200 ms current consumption with unloaded output 16 mA input low level 0.8 V input high level 2.0 5.5 V output low level 0.4 V output high level 3.3 V Note: 1. Encoder must be stationary during start-up. ABSOLUTE POSITION CHARACTERISTICS parameter conditions/description min typ max units resolution 12 or 14-bit accuracy 0.2 degrees absolute zero position configurable via AMT Viewpoint GUI 12-bit 25 s absolute position update rate 14-bit 100 s 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 12-bit position resolution 8,000 RPM rotational speed 14-bit position resolution 4,000 RPM cuidevices.comAdditional Resources: Product Page CUI Devices SERIES: AMT23 DESCRIPTION: MODULAR ABSOLUTE ENCODER date 09/10/2021 page 2 of 8 ENVIRONMENTAL parameter conditions/description min typ max units operating temperature -40 105 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 2 protocol single ended 3-wire Synchronous Serial Interface data rate 1 2 MHz T data shifted to output buffer 500 ns CLK T time before data is valid 250 ns DOV T time between reads 1 s CS Notes: 2. All SSI signals are single ended. This interface uses a chip select signal for initiating position reads. Figure 1 Timing Waveform T CS CHIP SELECT T CLK CLOCK * 16 1 1 * K1 K0 D14 D13 D5 D4 D3 D2 D1 K1 DATA T DOV Positional Data Bits Notes: *For 12-bit applications the clock can be stopped after 14 cycles, or if you clock the full 16 times L0 and L1 are always 0. Because the low two bits are 0, 12-bit data would need to be right-shifted two bits. The checkbit calculation remains the same and unaffected. Values K1 and K0 in the response are checkbits. The checkbits are odd parity over the odd and even bits in the position response shown in the equation below. The checkbits are not part of the position, but are used to verify its validity. The lower 14 bits are the encoder position. Example: Full response: 0x61AB 14-bit position: 0x21AB (8619 decimal) Checkbit Formula Odd: K1 = (H5 H3 H1 L7 L5 L3 L1) Even: K0 = (H4 H2 H0 L6 L4 L2 L0) From the above response 0x61AB: Odd: 0 = (1 0 0 1 1 1 1) = correct Even: 1 = (0 0 1 0 0 0 1) = correct cuidevices.com