Linear and OffAxis Magnetic Encoder ICs start & play High resolution 25m - AS5304 15m - AS5306 High speed 20m/s - AS5304 12m/s - AS5306 Optical encoder compatible user interface Sales Offices Worldwide Europe: France, Germany, Italy, Switzerland, United Kingdom, Finland, Sweden | North America: USA CA, USA NC | Asia: Hong Kong, China, Japan, Korea, Singapore, Taiwan | South Africa www.austriamicrosystems.com industry@austriamicrosystems.com (c)10/2008 by austriamicrosystems AG Subject to change without notice Headquarters austriamicrosystems AG Tobelbader Strasse 30, 8141 Unterpremstaetten, Austria Phone +43 3136 500-0 * Fax +43 3136 525-01 General Description Key Features Benefits The AS5304 and AS5306 devices are high perfor mance fixed resolution encoder options containing on-chip hall sensor elements and signal processing for measuring linear and off axis rotary motion. Due to the fixed resolutions, the AS5304 and AS5306 devices do not require any register configuration by the host controller at start up or during operation. - On-chip automatic gain and offset correction - High sensitivity: supports as low as 5mT magnet field amplitudes - Single track system allows for lower magnet costs - High magnet to IC air gap tolerance - High immunity to external magnetic fields - Magnetic field strength alarm indicator (A0 output) The AS5304 and AS5306 devices allow system designers to develop rotary encoder applications in mechanical systems where the sensor IC cannot be mounted at the end of a rotating device (e.g. at hol low shafts). Instead, the IC is mounted off-axis under neath a multi-pole single strip magnetized ring. Both devices can also be used in linear encoder applica tions where the IC is mounted directly underneath a single strip linear multi-pole magnet. Communication to the host controller is made using an index output and incremental A/B quadrature outputs providing 40 quadrature pulses (160 steps) per magnet pole period. Applications - Complete system-on-chip - Lower cost solution compared to traditional optical encoders - No register configuration by host at start up or during operation - High reliability due to non-contact sensing - Extended temperature range - Suitable for the use in harsh environments - Robust against external magnetic stray fields Ideal for any high speed linear motion and off-axis rotation measurement in applications such as: - Electrical motors - Linear X-Y-stages - Rotation knobs - Industrial drives Ordering Guideline Device Using, for example, a 32pole-pair circular magnetic ring, the AS5304 and AS5306 can provide a resolu tion of 1280 pulses/rev, which is equivalent to 5120 positions/rev or 12,3 bit. The maximum speed at this configuration is 9375 rpm. The AS5304 requires a multipole magnet with a pole pair length of 4mm and the AS5306 requires 2.4mm pole pair length. A pole pair consists of one magnetic north and one magnetic south pole with equal length. The AS5304 and AS5306 are both 5V operating de vices available in a small 20-pin TSSOP package and specified for an operating ambient temperature of -40 to +125C. Resolution Magnet Pole Length m mm AS5304A 25 2 Push Pull AS5304B 25 2 Open Drain AS5306A 15 1.2 Push Pull AS5306B 15 1.2 Open Drain DC 5V Block Diagram AS5304 / AS5306 SIN Hall Array & Frontend Amplifier COS Signal Processing & Channel Amplifier Automatic Gain Control www.austriamicrosystems.com/linearencoders Digital Outputs (A/B & Index Outputs) SIN COS ADC & DSP magnetic field alarm A A/B Quadrature Incremental Interface & Index Analog Output B GPIO Index AO Microcontroller