AS5601-ASOT datasheet(8/43 Pages) AMSCO

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[v1-02] 2014-Oct-29

AS5601 − Detailed Description

The AS5601 is a Hall-based rotary magnetic position encoder

that converts the magnetic field component perpendicular to

the surface of the chip into voltages which are used to produce

incremental A/B outputs and absolute position indication in

registers that can be read over an industry-standard I²C bus.

The analog signals from the Hall sensors are first amplified and

filtered before being converted by the analog-to-digital

converter (ADC) into binary data. The output of the ADC is

processed by the hardwired CORDIC block (Coordinate Rotation

Digital Computer) to compute the angle and magnitude of the

magnetic field vector. The intensity of the magnetic field is used

by the automatic gain control (AGC) to adjust the amplification

level to compensate for temperature and magnetic field

variations.

The angle value provided by the CORDIC algorithm is used by

the internal logic to generate the incremental quadrature

signals A and B. The magnitude and AGC value is dynamically

monitored and generates the PUSH output for fast changes of

the airgap between the magnet and the AS5601. Very slow

changes are suppressed to provide a robust and reliable

pushbutton output that tolerates temperature variation and

magnet degradation.

The AS5601 is programmed through an industry-standard I²C

interface to write an on-chip one-time programmable (OTP)

memory. This interface can be used to program a zero angle

and to configure the chip.

Power Management

The AS5601 is powered from a 5.0V supply using the on-chip

LDO regulator, or it can be powered directly from a 3.3V supply.

The internal LDO is not intended to power other external ICs

and needs a 1μF capacitor to ground, as shown in Figure 11.

In 3.3V operation, the VDD5V and VDD3V3 pins must be tied

together.

Detailed Description

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