AS5247 datasheet(10/37 Pages) AMSCO

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AS5247 – 10

ams Datasheet: 2014-Jun-20 [v1-02]

De tail ed De sc rip t ion

Figure 11:

5.0V and 3.3V Power Supply Options

After applying power to the chip, the power-on time (tpon)

must elapse before the AS5247 provides the first valid data.

Dynamic Angle Error Compensation

The AS5247 uses 4 integrated Hall sensors on Bottom Die and

Top Die, 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.

1µF

100nF

4.5 - 5.5V

VDD3V3

GND

VDD

5.0V Operation

LDO

AS5247

100nF

3.0 – 3.6V

VDD3V3

GND

VDD

3.3V Operation

LDO

AS5247

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