AS5132 DB ams

austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems application note is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams sales ams.com Please visit our website at www.ams.com AS5132-DB-1.0 Demoboard AS5132 8 BIT PROGRAMMABLE HIGH SPEED OPERATION MANUAL MAGNETIC ROTARY ENCODER 1 General Overview The AS5132 is a contactless magnetic rotary encoder for accurate angular measurement over a full turn of 360. It is a system-on-chip, combining integrated Hall elements, analog front end and digital signal processing in a single device. To measure the angle, only a simple two-pole magnet, rotating over the center of the chip is required. The absolute angle measurement provides instant indication of the magnets angular position with a resolution of 8.5 bit = 360 positions per revolution. This digital data is available as a serial bit stream and as a PWM signal. An additional U,V,W output can be used for a block commutation for a brushless DC motor. An incremental signal is available as an option. In addition to the angle information, the strength if the magnetic field is also available as a 5-bit code. A software programmable (OTP) zero position simplifies assembly as the zero position. The magnet does not need to be mechanically aligned. To optimize the torque characteristic at a certain speed the AS5132 has the option to use a static or dynamic pre- commutation. 2 The AS5132 Demoboard The AS5132 demoboard is a complete rotary encoder system with built-in microcontroller, USB interface, graphical LCD display, incremental indicators, commutation indicators and PWM output LED. The board is USB powered or externally supplied with a 9V battery for standalone operation. For this Demoboard the AS5132 is configured with UVW Output. LCD display (for standalone mode) 9V battery connector (standalone only) SiLabs C8051C320 microcontroller Knob with D5x2.5mm diametral magnet, 2mm over the AS5134 UVW commutation LEDs USB cable to the PC AS5134 output signals connector and indicators *Switch INT - EXT Figure 1: AS5132 Demoboard hardware with mounted magnet knob Revision 1.1, 07.October 2009 Page 1 of 13 www.austriamicrosystems.com ams AG Technical content still valid