AS5047D datasheet(23/37 Pages) AMSCO

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ams Datasheet: 2014-Jun-27 [v1-02]

AS5047D – 23

Detaile d Desc rip t ion

Hysteresis

The hysteresis can be programmed in the HYS bits if the

SETTINGS2 register and depends on the chosen resolution of

the incremental interface (ABIRES), as shown in the Figure 35.

Figure 35:

Hysteresis Settings

Automatic Gain Control (AGC) and CORDIC

Magnitude

The AS5047D uses AGC to compensate for variations in the

magnetic field strength due to changes of temperature, air gap

between the chip and the magnet, and demagnetization of the

magnet. The automatic gain control value can be read in the

AGC field of the DIAAGC register. Within the specified input

magnetic field strength (Bz), the Automatic Gain Control works

in a closed loop and keeps the CORDIC magnitude value (MAG)

constant. Below the minimum input magnetic field strength,

the CORDIC magnitude decreases and the MAGL bit is set.

Diagnostic Features

The AS5047D supports embedded self-diagnostics.

MAGL: magnetic field strength too high, set if AGC = 0xFF. This

indicates the non-linearity error may be increased.

MAGH: magnetic field strength too low, set if AGC = 0x00. This

indicates the output noise of the measured angle may be

increased.

COF: CORDIC overflow. This indicates the measured angle is not

reliable.

LF: offset compensation completed. At power-up, an internal

offset compensation procedure is started, and this bit is set

when the procedure is completed.

HYS

Hysteresis (degree) - ABIRES ≥

1600 steps per revolution

Hysteresis (degree) - ABIRES ≤

1024 steps per revolution

0.53

0.7

0.35

0.175

no hysteresis

1.05

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