AS5311

AS5311 High Resolution Magnetic Linear Encoder 1 General Description The AS5311 is a contactless high resolution magnetic linear encoder for accurate linear motion and off-axis rotary sensing with a resolution down to <0.5µm. It is a system-on-chip, combining integrated Hall elements, analog front end and digital signal processing on a single chip, packaged in a small 20-pin TSSOP package. A multi-pole magnetic strip or ring with a pole length of 1.0mm is required to sense the rotational or linear motion. The magnetic strip is placed above the IC at a distance of typ. 0.3mm. The absolute measurement provides instant indication of the magnet position within one pole pair with a resolution of 488nm per step (12bit over 2.0mm). This digital data is available as a serial bit stream and as a PWM signal. Furthermore, an incremental output is available with a resolution of 1.95µm per step. An index pulse is generated once for every pole pair (once per 2.0mm).The travelling speed in incremental mode is up to 650mm/second. An internal voltage regulator allows the AS5311 to operate at either 3.3 V or 5 V supplies. Depending on the application the AS5311 accepts multi-pole strip magnets as well as multi-pole ring magnets, both radial and axial magnetized (see Figure 1 and Figure 3). Figure 1. AS5311 Block Diagram The AS5311 is available in a PB-free TSSOP-20 package and qualified for an ambient temperature range from -40°C to +125°C. 2 Key Features Two 12-bit digital absolute output...