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AS5163

Datasheet - Detailed Descr i pti on

7 Detailed Description

The AS5163 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 AS5163 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.

The AS5163 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 pin 14 (OUT).

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

start angle position T1 and the end point T2 can be set and programmed according to 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 to 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 AS5163 also provides a compare function. The internal angular code is compared to a programmable level using hysteresis. The function is

available over the output pin 11 (KDOWN).

The output parameters can be programmed in an OTP register. No additional voltage is required to program the AS5163. 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. Else, the content could be frozen for ever.

The AS5163 is tolerant to magnet misalignment and unwanted external magnetic fields due to differential measurement technique and Hall

sensor conditioning circuitry.

Figure 3. Typical Arrangement of AS5163 and Magnet