CUI Inc. (www.cui.com) unveiled the latest addition to the company’s high-resolution, low-cost AMT encoder line, the new AMT303 series. This encoder generates U/V/W commutation signals for vectoring current to brushless motors. Through the AMT303’s SPI (“Serial Peripheral Interface”), resolutions can be set. Commutation output can hold brushless motors with two, four, six, eight or 10 pole pairs, and it is also selectable through the SPI. The new AMT303 has supplementary incremental Z, B, and A channels for a variety of servo startup and positioning sequences. More options include ten bore sizes and nine mounting patterns, to create a flexible platform which can be paired with many industry standard motors.

The new AMT303 generates position information through CUI’s patented, capacitive code generation system with a proprietary ASIC. Its technology is immune to magnetic interference and environmental particulates, creating an economical, reliable and stable positioning and control solution. The new encoder consumes 10 mA at 5 V DC, making it convenient for any application.

The AMT303 encoder’s SPI affords simpler hardware and higher throughput interfacing than SMBus or I²C. The onboard PIC 16F690 MCU runs at up to 10 MHz providing for high-speed applications using a TCL code. Zero position may be achieved by ground trigger or SPI command, eliminating the need for long mechanical alignment during the mounting process. Moreover, an EEPROM can accommodate up to 128 bytes of user data. A demo board is also available for standalone demonstration, example TCL code and PC access to SPI interface.

“We believe the AMT303 series represents a breakthrough in commutation encoders,” said James Seiler, Encoder Product Manager of CUI. “Users will really be able to leverage the benefits of our ASIC-based system. When compared to optical encoders typically used in commutation applications, the AMT303 will bring a level of ruggedness and ease of use unrivaled in the industry.”