AS5047U-HTST datasheet(12/51 Pages) AMSCO

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[v1-00] 2018-Oct-30

AS5047U − Detailed Description

Dynamic Angle Error Compensation

The AS5047U uses 4 integrated Hall sensors which produce a

voltage proportional to the orthogonal component of the

magnetic field to the die. These voltage signals are amplified,

filtered, and converted into the digital domain to allow the

CORDIC digital block to calculate the angle of the magnetic

vector. The propagation of these signals through the analog

front-end and digital back-end generates a fixed delay between

the time of measurement and the availability of the measured

angle at the outputs. This latency generates a dynamic angle

error represented by the product of the angular speed (ω) and

the system propagation delay (tdelay):

DAE =

ω x tdelay

The dynamic angle compensation block calculates the current

magnet rotation speed (

ω) and multiplies it with the system

propagation delay (tdelay) to determine the correction angle to

reduce this error. At constant speed, the residual system

propagation delay is tdelay_DAEC.

The angle represented on the PWM interface is not

compensated by the Dynamic Angle Error Compensation

algorithm. It is also possible to disable the Dynamic Angle Error

Compensation with the DAECDIS setting. Disabling the

Dynamic Angle Error Compensation gives a noise benefit of

0.016 degree rms. This setting can be advantageous for low

speed (under 100 RPM) respectively static positioning

applications.

Adaptive Filter System

The AS5047U uses an implemented adaptive filter system,

which reduces the transition noise.

The filter works dynamically depending on acceleration

(positive and negative acceleration) of rotating system. It is able

to match the right filter coefficients automatically.

The filter coefficients (K value), which define also the limits in

which the filters is acting, can be set in the OTP (K_min= 0x00

and K_max=0x00 by default).In addition, there is the possibility

to turn off the filter in the OTP.

(EQ1)

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