AS5147P-HTST datasheet(11/40 Pages) AMSCO

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[v1-01] 2015-May-12

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AS5147P − Detailed Description

Dynamic Angle Error Compensation

The AS5147P 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. 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.

(EQ1)

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