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AS5263

Datasheet - Detailed Descr i pti on

7 Detailed Description

The AS5263 is manufactured in a CMOS process and uses a spinning current Hall technology for sensing the magnetic field distribution across

the surface of the chip.

The integrated Hall elements are placed around the center of the device and deliver a voltage representation of the magnetic field at the surface

of the IC.

Through Sigma-Delta Analog / Digital Conversion and Digital Signal-Processing (DSP) algorithms, the AS5263 provides accurate high-resolution

absolute angular position information. For this purpose a Coordinate Rotation Digital Computer (CORDIC) calculates the angle and the

magnitude of the Hall array signals.

The DSP is also used to provide digital information at the outputs that indicate movements of the used magnet towards or away from the device’s

surface.

A small low cost diametrically magnetized (two-pole) standard magnet provides the angular position information (see Figure 26).

The AS5263 senses the orientation of the magnetic field and calculates a 14-bit binary code. This code is mapped to a programmable output

characteristic. The type of output is programmable and can be selected as PWM or analog output. This signal is available at the pins 27, 28

(OUT_T, OUT_B).

The analog output and PWM output can be configured in many ways. The application angular region can be programmed in a user friendly way.

The starting angle T1 and the end point angle T2 can be set and programmed according the mechanical range of the application with a

resolution of 14 bits. In addition the T1Y and T2Y parameter can be set and programmed according the application. The transition point 0 to 360

degree can be shifted using the break point parameter BP. This point is programmable with a high resolution of 14 bits of 360 degrees. The

voltage for clamping level low CLL and clamping level high CLH can be programmed with a resolution of 7 bits. Both levels are individually

adjustable.

These parameters are also used to adjust the PWM duty cycle.

The AS5263 provides also a compare function. The internal angular code is compared to a programmable level using hysteresis. The function is

available over the output pins 21, 22 (KDOWN_T, KDOWN_B).

The output parameters can be programmed in an OTP register. No additional voltage is required to program the AS5263. The setting may be

overwritten at any time and will be reset to default when power is cycled. To make the setting permanent, the OTP register must be programmed

by using a lock bit the content could be frozen for ever.

The AS5263 is tolerant to magnet misalignment and unwanted external magnetic fields due to differential measurement technique and Hall

sensor conditioning circuitry.

It is also tolerant to air gap and temperature variations due to Sin-/Cos- signal evaluation.

The AS5263 is tolerant to magnet misalignment and magnetic stray fields due to differential measurement technique and Hall sensor

conditioning circuitry.