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AS5050

Datasheet - Application In form atio n

Daisy Chain, 4 Wire.

Figure 15. Daisy Chain, 4-Wire

8.2 Placement of the Magnet

Non-Linearity Error over Displacement.

As shown in Figure 17, the recommended horizontal position of the magnet axis is over the diagonal center of the IC.

Figure 16 shows a typical error curve at a vertical magnet distance of 1.0mm, measured with a NdFeB N35H magnet with 6mm diameter and

2.5mm height.

The X- and Y- axis of the graph indicate the lateral displacement of the magnet center with respect to the IC center.

At X = Y = 0, the magnet is perfectly centered over the IC. The total displacement plotted on the graph is for ±1mm in both directions.

The Z-axis displays the worst case INL error over a full turn at each given X-and Y- displacement. The error includes the quantization error of ±½

LSB. At the sample shown in Figure 16, the accuracy for a centered magnet is better than 0.5°. Within a radius of 0.5mm, the accuracy is about

1.0° (spec = 1.41° over temperature).

UC

AS5050

I

MOSI

MISO

SCK

SS/

MOSI

MISO

SCK

SS/

Wire_Mode

1

AS5050

III

MOSI

MISO

SCK

SS/

Wire_Mode

1

Write CMD

SW reset

Write CMD

SW reset

...

Write CMD

SW reset

UC MOSI

UC MISO

0xFFFF

0xFFFF

AS5050

II

MOSI

MISO

SCK

SS/

Wire_Mode

1

0xFFFF

SS/

Read angle3

Read angle3

Read angle1

Angle3

Read angle2

Read angle2

Angle2

Read angle1

...

Angle3

Angle1

...

...

Angle1

Angle2

UC MOSI

UC MISO

SS/

0xFFFF

0xFFFF

0xFFFF